Java题库及章节练习题（全）

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12119.᪀⌼&'Ḅ&'¦ᵫ_§ᕒ¨©¦஺120.ឋḄ◚ᢣ¯D°±8x²᱄DbcᩭḄ¦´µ஺121.᝞p᱄DParentḄyz/½c¯DChildḄyz/ᑣ9:p=cÅÆḄ஺122.%D᝞ÇÈÉÊ%ËÌ/ÍÎÏÐÑ⌚ÓËÌ*Ḅᡠᨵ&'஺123.¯D7>bc᱄DḄ᪀⌼&'஺124.%¯D°±8x²᱄DÍÖbcᩭḄ¦&'/½×ᐕÙÏÚᨵ7ḄÛÜo஺125.DḄ᪀⌼&'¦ÐÑÞD¦ß஺126.☢ᔣyzḄãäå&'ᵨDæᦪÞçdᦪḄèLᙠé/ê×DYᙠbcᐵì஺127.&'ᨵÛÜo/ᡈᨵ%ÛÜo/îᨵ%ÛÜo஺128.%D*ᵨprivate⛲P⛲Ḅឋᡂᕒ/ñDḄ&'ÞÏḄ¯DḄ&'òó஺129.ËÌôᱯöḄD/ËÌ*Ḅ´µE.µ/ËÌ*Ḅ&'E÷z&'/øùËÌ*Ḅ´µEaᵫpublicstaticfinal⛲/ËÌ*Ḅ&'Eaᵫpublicabstract⛲஺130.%JavaDᨵ%᱄D஺131.ËÌᱯöḄD/ᡠËÌîbc/¯ËÌÿ
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LKMNO஺136.Java123ḄᦪRᐗTU᪗W,X0Z[U᪗45,᦮ᦪᡈ᦮]⊤^_஺137.aString*s="H",ij1kSystem.out.println(s.concat("ello!"));vString*sḄᑁx“Hello!”ᡠ51k{|“Hello!\138.ᵨ“+”45:Ḅᵨ-45X&':3◀&':஺139.ᦪR&ᓰᵨḄᑁ஺140.ᵨ1ength()45:ᡈᦪRḄ஺141.ᡠᨵḄ᪗ᵫMouseListenerḄὅᩭᜐᳮ஺142.JavaḄ£¤ᙶ᪗,5¦Tᓫ¨xᘤḄªU«M¬ᙶ᪗Ḅ®஺143.&'xᘤ345¯ᔠᵨ±²³´µᶍ஺144.JavaḄᜐᳮ·ᑴ3¹ᐭ»¼ᡲ¾]ᐹ)¿ᩭÀ,ᡠᨵ%ᨵ&'ὅÁÂÃ*Ä+%3ḄÅ'ᐹ)%]Æᨵ&'ᐹ)ḄÁÂ*Ä஺145.xᘤ,ᵨᩭRÇᐸÉÊ☢ᡂᑖᐗTḄᓫᐗ!"KÎᝅᐸÉxᘤ஺146.Ð,JavaAppletÒÓÔÕÖOjava.appletᒹ஺147.ᙠAppletḄᙶ᪗Ú3(0,0)D⊤{|۪ܫḄT®஺148.JavaApplet,ᵫÝÞḄßàᘤÒÓᩭijḄ஺

13149.JavaAppletÆKᙠáâÊ☢Uãä஺150.AppletÒÓå4567æçᘤᩭijL4567èéjᩭij஺êஹ▅íᑖ᪆151.▅íÒÓïðñ⚪1):publicclassA{2):publicstaticvoidmain(Stringargs[]){3):intx=l;4):for(inti=l;i<=5;i++){5):if(i%2==0)6):continue;7):x*=i;8):)9):System.out.println(,,x=',+x);10):)H)ó)ñ⚪óÒÓ{|Ḅôõ,ö÷ø152.▅íÒÓïðñ⚪1):publicclassA{2):publicstaticvoidmain(Stringargs[]){3):Xx=newX();4):Yy=newY();5):x.showX();6):y.showY();7)ó)8)ó}9):10):classX{11):publicvoidshowX(){12):SysteTn.out.println(naaaaau);13):)14):)15):16):classY{17):Xa=newX(){18):publicvoidshowX(){19):System.out.printlnC'bbbbb");20):)21):}ù22):publicvoidshowY(){23):a.showX();}24):)ÒÓú5jḄûᵨ{|Ḅôõ᝞ýø153.▅íÒÓïðñ⚪1):publicclassA{

142):publicstaticvoidmain(String[]args){3):longfirst=1,second=1,third;4):System.out.print(first+""+second+"”);5):for(inti=3;i<=6;i++){6):third=first+second;7):System.out.print(third+"");8):first=second;9):second=third;10):)11)ó)12):)ÒÓ{|Ḅôõ,ö÷ø154.ᑏ|Uᑡ
ᡂḄspublicclassSum{publicstaticvoidmain(Stringargs[]){doublesum=0.0;for(inti=1;i<=100;i++)sum+=1.0/(double)i;System.out.println(nsum=u+sum);))155.ᑏᑡ
Ḅ஺importjava.io.*;publicclassClassi{publicstaticvoidmain(Stringargs[]){intil=1234,i2=456,i3=-987;intMaxValue;MaxValue=max(il,i2,i3);System.out.println("ᦪḄᨬᜧ"+MaxValue);)publicstaticintmax(intx,inty,intz){inttemp1,max_value;templ=x>y?x:y;max_value=templ>z?templ:z;returnmax_value;))156.ᑏᑡ
Ḅimportjava.io.*;

15publicclassClassi{publicstaticvoidmain(Stringargs[]){SubClassa=newSubClass(10,3);System.out.println(a.exp());))classSuperClass{floatx;intn;SuperClass(floatxx,intnn){x=xx;n=nn;)}classSubClassextendsSuperClass{SubClass(floatxx,intnn){super(xx,nn);)floatexp(){floats=1;for(inti=1;i<=n;i++)s=s*x;returns;))157.▅
⚪1):publicclassA{2):publicstaticvoidmain(Stringargs[]){3):Mylnterfaceobj2=newB(nB");4):obj2.show();5))6))7)8):interfaceMylnterface{9):doubleG=88;10):voidshow();H))12):13):classBimplementsMylnterface{

1614):15):Stringstr;16):publicB(Strings){17):str=s;18):}19):publicvoidshow(){20):System.out.println(str4-U:G="+G);21):}22):)
811ḄMylnterface!"#$
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.⚪஺classParent{voidprintMe(){System.out.println("parent");))classChildextendsParent{voidprintMe(){System.out.println(uchild);)voidprintAll(){super.printMe();this.printMe();printMe();)publicclassTest_this{

17publicstaticvoidmain(Stringargs[]){ChildmyC=newChild();myC.printAll();%&'()$160.▅
⚪஺1):publicclassA{2):publicstaticvoidmain(Stringargs[]){3)try(4):intx[]={1,2,3)<5):intk=Integer.parseInt(args[O]);6):System.out.println(x[k]);7):System.out.println(“try&=>”)<8))9):catch(ArrayIndexOulOfBoundsExceptione){10):System.out.println("᡻catch*');11))12):finally{13):System.out.println("᡻finally*');14):}15):System.oul.prinlln("
&=>”)<16):}17):)5ᙠCDEFG
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⚪஺classstudent{Stringname;intage;intscore=88;student(Stringal,inta2,inta3){name=al;age=a3;score=a2;)ᙠOᵨGQROᵨ☢STUᡂVGḄ67:

18studentsl,s2;sl=newstudent("X”,20,33);s2=newstudent();s1.name,s1.age,s1.scoreḄᔜ(),s2.nae,s2.age,s2.scoreḄᔜ()$162.ᑏᑡ
Ḅimportjava.io.*;publicclassClassi{publicstaticvoidmain(Stringargs[]){inti,Max,Min;inta[]={12,67,8,98,23,56,124,55,99,100);Max=Min=a[0];for(i=1;iMax)Max=a[i];)System.out.println(Max+"H+Min);System.out.println();))163.▅☢Ḅ
ᑏ%&'஺iimportjava.io.*;publicclassABC{publicstaticvoidmain(Stringargs[]){StringCs=newStringC(',He,',nllon);System.out.println(s.toString());))classStringC{Stringsi;Strings2;StringC(Stringstrl,Stringstr2){si=strl;s2=str2;)publicStringtoString(){returnsl+s2;))164.ᑏᑡ
Ḅ஺publicclassABC{publicstaticvoidmain(StringargslJ){

19intiJ;inta[]={12,67,8,98,23,56,124,55,99,100);for(i=0;i

208):myTreeSet.add(,,an);9):myTreeSet.addCb");10):myTreeSet.add(Mc,');11):Iteratormylter=myTreeSet.iterator();12):while(myIter.hasNext())13):System.out.print(mylter.next());14):System.out.println();15):}16):)⚪
MH%Ḅ&'()$167.▅
⚪classA{publicstaticvoidmain(String[]args){Strings,sl=nM;charc;s=args[0];for(inti=O;i=*a'&&c<-z,){sl=sl+Character.toUpperCase(c);}else{sl=sl+Character.toLowerCase(c);))System.out.println(s1);)}5ᙠdosCD%ᐭjavaAhELLO,ᑣ%[()஺168.▅
⚪importjava.util.*;publicclassLinkExample{publicstaticvoidmain(Stringargs[]){LinkedListmylist=newLinkedList();mylist.add("how");mylist.addC'are");mylist.add("you");mylist.add(nJavau);intnumber=mylist.size();System.out.println("0ᙠ\⊤^ᨵ“+number+”⁚a)

21
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Ḅ஺publicclassmainthread{publicstaticvoidmain(String[]args){Threadthread=Thread.currentThread();System.out.println("Mainthreadisnamed"+thread.getName());))170.▅
⚪஺publicclassCompareTest{publicstaticvoidmain(String[]args){Stringstrl=newSlringC'heUoworld");Stringstr2=newString(,'hellon);System.out.println(str1,compareTo(str2));Stringstr3=newString(Hhellen);Stringstr4=newStringC^ello");System.out.println(str3.compareTo(str4));))⚪
MH%Ḅ&'()$171.ᑏᑡ
Ḅimportjava.awt.*;importjava.applet.Applet;publicclassAppletlextendsApplet{publicvoidpaint(Graphicsg){g.drawLine(30,5,100,45);g.drawRect(30,50,50,20);g.drawOval(30,80,50,40);g.drawString("Theyarefigures!1,,30,150);))172.▅☢Ḅ
:⚪஺importjava.awt.*;importjava.applet.*;importjava.awt.event.*;publicclassAppletlextendsAppletimplementsActionListener)Labelaa;TextFieldtl;inti=0;

22publicvoidinit(){aa=newLabel'b%ᐭc᦮ᦪ")

23JMenuBarmenubar=newJMenuBarQ;JMenumenu=newJMenu("ᦻq”)

2416):)
xᵨV()yz{9ḄuvgetLineNumber஺Ḅ()$177.▅
⚪importjava.io.*;publicclassReadLineTest{publicstaticvoidmain(String[]args){BufferedReaderb=newBufferedReader(newInputStreamReader(System.in));Strings;System.out.flush();s=b.readLine();System.out.println(s);))M:|
5}I~%ᐭHeHo<l,ᑣ%&'()$178.ᑏᑡ
ᡂḄ஺publicclassReverse{publicstaticvoidmain(Stringargs[]){inti,n=10;inta[]=newint[10];for(i=0;i=0;i`)System.out.print(a[i]+"");System.out.println();))179.ᑏᑡ
Ḅ஺importjava.net.*;importjava.io.*;publicclassURLConnectionReader{publicstaticvoidmain(String[]args)throwsException{URLweb=newURL(nhttp://www.swust.edu.cn");URLConnectionwebc=web.openConnection();BufferedReaderin=newBufferedReader(newInputStreamReader(

25webc.getInputStream()));StringinputLine;while((inputLine=in.readLine())!=null)System.out.println(inputLine);in.close();))180.ᑏᑡ
Ḅ஺importjava.io.*;publicclassa{publicstaticvoidmain(Stringargs[])throwsIOException{inti;floatf,r;BufferedReaderdin=newBufferedReader(newInputStreamReader(System.in));System.out.print(ninputi:");i=Integer.parseInt(din.readLine());System.out.print(Minputf:”)

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-9,11Ḅ¡¢)஺209.mainHIḄZ[ª)஺210.ᙠ«¬}VḄᔲ">?Fᵨ)HI஺211.UP|ᓄḄ}~⌶°±²ThreadP)212.|ᙠb³ᕜµ&⌕·ᔊ5~¹᝱ᑖ»T¹᝱>¹᝱¹᝱)¹᝱¼½¹᝱஺213.|VFᵨsleep஺000HIᑣ|¾Ḩ)ÀÁ஺214.|Fᵨstart஺HI@ÂÃ||Ä)¹᝱ᐭÆÇÈᑡ᣸È஺215.!ᙠËᐜ|Ḅrun
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32᡻Dcatch᡻DfinallyIJ¬®161.sl.name="±"=sl.age=33,sl.score=20s2.name=null,s2.age=0,s2.score=88162.ᙠᦪ1³´>µ¶ᨬᜧ·ᨬH஺163.hello164.¸ᵨ⌱¹sᦪaḄᦪº»DᓣJ᣸J=ᯠ¥µ¶᣸J¥Ḅ¬¾஺165.ᦪᔜᐗÁḄ·஺166.abcxyz167.Hello168.R+,-"how"="are","you","Java"ᑮLinkedList1=>µ¶È⊤1ᐳᨵÌÍ*⁚Ï஺169.(ÐÑÒᡂḄL+=>ᙠÔÕµ¶஺170.5-10171.ᙠApplet×☢1ÙÚ)ÛᵫÝÒÞஹßà᪾·âᙊ·ᦻ+ᡂḄäà=ᐸ1bÝÒÞᙶ᪗(30,5)éᑮᙶ᪗(100,45)êëßàìíᙶ᪗M(30,50),îM50,ïM20ëâᙊ᜜¦ßàìíᙶ᪗M(30,80),ñòóî50,ᚖÝóî40ëᦻ+ᑁöM“Theyarefigures!ᙠᙶ᪗(30,150)ᜐìᑮúñòµ¶஺172.a=42i=6173.1234567174.ûü)*᪗⚪M“)*ýᓫþᓫÿ”Ḅᨵ“ᦻ”᪵Ḅᓫ஺175.actionPerformed(),&ᙠᦻ()ᢥ+,-./0123ᵨᐸ6789ᦻ()Ḅᦻ(:ᣚ8int<ᦪ>?@i,ABrepaint஺D3ᵨpaint஺01EFGH஺176.ᦻJKLᑮᦻTest.javaRSTḄTU஺177.Hello178.Y᪗[Eᐭ(ᓽ-^)_ᐭ10a᦮ᦪcᐭ᦮<ᦪdaᯠf⌮hEFi10a᦮ᦪ஺179.URLConnectiono@pḄURLqr(http://www.swust.edu.cn){T_9|ᙠstu஺180.}ᵨBufferedReaderY-^ᦈSa᦮ᦪSaᦪḄᯠfᙠstuEF஺ஹ⚪181.0182.ᑖG᪀

33183.false184.returna+b185..java186.ᦻ᫏ᡈὅAPIᦻ᫏187.void188.1189.◀29ᖪᡈὅ◀2190.ᡈὅ191.boolean192.Yᑮ193.case194.throw195.Throwable196.¡197.¢Ḅ£¤¥ᑴ(ᡈᐸ§¨©ª)198.new199.static200.ᡂᕒ01201.202.implements203.204.205.final206.90207.boolean208.-9209.publicstaticmain(String[]args)ᡈὅpublicstaticmain(Stringargs[])210.equals()211.®Runnable212.¯°213.1000214.±¡215.²³ᐜµ216.¶ᘤ217.CardLayout218.BorderLayout219.JButtongb=newJButton("ᐵº")»220.ᑁ¶☢¾221.o¿K

34222.InputStream223.Filteroutputstream224.ᑁ¶225.str=dis.readUTF();226.HTML227.Appl.class228.Java.applet.AppletᡈὅApplet229.getPatameterInfo()230.ᑁ¶☢¾ÀஹÁÂ⚪(ᶍ)...JavaÂhÄÅSÆJavaÂhÇᵫÉÊdᡂḄËSaÂhÌÍᨵpublicᔩËJavarᦻḄÏÐᑣÇÒ᪵ḄËÓÔSaJavarÂhÇᵫÕÖadᡂ஺SaJavaÂh×Sp◤⌕ᨵpublicÔ᝞HrᦻᨵÛa.ᑣÜ7ᨵSaÇpublicÔ᝞HrᦻÜᨵSaᑣ×Ý/ᑏᡂpublicßÝàá8â஺rᦻÏ.⌕ãrᦻâäåâæᓽᵨpublicç⛲ḄéḄêë᡽í8.java஺᝞HîᨵpïpublicᑣðñòSa8âᦻ&ᯠiÇ×âóḄô8Ýõ1{T2ö÷}ᵨ஺ø᜜oAppletúäᵨÂhᩭüᐸâÌÍ8public,ᔲᑣþᯠᙠSÿ

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369ᵨ8?ᵨᡈKLḄ2.OPᵨQᡈERSஹKLTU᦮ᦪḄWᣚ஺>intx=5,y=19;x=xy>y=y'xex=x'y;3.gᑡiUᔠkḄ᪗mS>no஺Aஹa=bBஹHelloC>2ndDஹChongqing>B4.gᑡiᔠkḄ᪗mSno஺AஹnewBஹclassC>intDஹconst2>D5.᝞AᨵHdoubledl,d2=4.0ᑣgᑡkḄ:AஹHdl,d2ᙳᓄ4.0BஹHdlᨵᓄ,d2ᓄ4.0CஹHdl,d2ᙳᓄDஹHd2ᨵᓄ,dlᓄ4.0>B6.ᑨ⚪>ᡠᨵḄHᙠPᵨ?ᓄ஺no>஺7.ᑁᦪ78byteḄ¡£>noAஹ0-65,535Bஹn-128o127Cஹn-32,768o32,767Dஹn-256o-255>B8.gᑡiC¦§"$¨Ḅ%©>noAஹinti=32;Bஹfloatf=45.0;Cஹdoubled=45.0;Dஹchara='c';>B9.ᑨ⚪>Java®ᦪ78Ḅ¯°±ᐹ³PᵨḄ´ᘤ¶ᐵ஺no>┯¹஺10.᝞AᨵdoubleXefloatyeintm,ᑣ⊤½x*y-mḄ8no>AஹdoubleB,floatCஹintD>short>A11.᝞Aᨵshortsebytebecharc,ᑣ⊤½s*b+cḄ8o>

37AஹcharBஹshortCஹintDஹbyte:C12.ÀÁinti=2147483647;++ieᑣiḄ¡(ÂÃÄnoA-2147483648B2147483647C2147483648>A13.ÀÁbytei=127;++ieᑣiḄ¡(ÂÃÄnoA-128B127C128>A14.ÀÁbytei=127;i=i+leÅT%©¦ᔲ$¨ᡂÈ=no>$¨CᡂÈ஺15.᡻Êg#ËÌinta=5,b;b=++a*3ÍbḄ¡>noAஹ17Bஹ18Cஹ16Dஹ15>B16.᝞x=3,y=5,ᑣ⊤½x|yḄ¡>noAஹ15Bஹ8Cஹ1Dஹ7>D17.᝞inta=3,b=2,ᑣ᡻a*=b+8ÍaḄ¡>noAஹ20Bஹ14Cஹ30Dஹ16>C18.ÏᡠᵨH?ÀAÊg⌱⚗®ÒkḄ⊤½>noAஹa!=4|b==lBஹ'a'%3Cஹ'a'=l/2Dஹ'A'+32>C19.ᨵA%©int=1,2};ᑣÊg×%©ḄØÙ┯¹Ḅno஺AஹAÚ+UÛaḄ+ÜᦪÝBஹaᦪÝᨵ3UᐗßCஹaᦪÝḄg᪗1-3DஹᦪÝ®ḄàUᐗß᦮8>C20.ÊgᦪÝᓄáḄ>noAஹinttl□□={{1,2},{3,4},{5,6}}Bஹintt2[][]={1,2,3,4,5,6}Cஹintt3[3][2]={1,2,3,4,5,6}Dஹintt4□æet4={l,2,3,4,5,6}>A*ç,-⚪./ὃ⚪1ஹ$ᑏ+U#Ë,ᵨ⌱ékᦪÝa□={20,10,55,40,30,70,60,80,90,100}ᜧᑮëḄ᣸Ë>publicclassArraySort{publicstaticvoidmain(Stringargs[]){intarray[]={20,10,55,40,30,70,60,80,90,100};inti,j,k,t;intm=array.length;

38for(i=0;i

39publicclassMultiTable{publicstaticvoidmain(Stringargs[]){inti,j,n=9;System.out.printC*|஻)7for(i=l;i<=n;i++)System,out.print(஻஻+i);System,out.print(஻

40-------1஻)7for(i=l;i<=n;i++)System,out.print(஻----")7System,out.printin();for(i=l;i<=n;i++){System,out.printC஻+i+஻|஻)7for(j=l;j<=i;j++)System,out.print(஻஻+i*j);System,out.printin();)))4ஹ?@ᐗBCDEax2+bx+c=0Ḅ᪷I⌕?aஹbஹcKLᑴNOᐭ஺mportjava.io.*;//importjava.awt.*;publicclassabcxxx(publicstaticvoidmain(Stringargs[])throwslOException(BufferedReaderkeyin=newBufferedReader(newInputStreamReader(System,in));Stringx;doublea,b,c;doublexl,x2,pl,p2,disc,absdisc;System,out.print(IzCtrl+Ctoescape:;for(;true;)(System,out.printIn(zIEntera(enter)

41b(enter)

42c(enter):

43");x=keyin.readLineO;

44a=Double.parseDouble(x);x=keyin.readLineO;b=Double.parseDouble(x);x=keyin.readLineO;c=Double.parseDouble(x);System,out.println(zza=஻+a+஻b=஻+b+஻c=஻+c);if(a=0.0){if(b!=O.0){System,out.printin(IzNotaquadrtaticrootis"+(-c/b));)else{if(c=0.0)System,out.printin(஻Trival஻)7elseSystem,out.println(zIIMpossibleI/);))else{pl=-b/(2.0*a);disc=b*b-4.0*a*c;absdisc=disc>=O?disc-disc;p2=Math.sqrt(absdisc)/ফ0*a);if(disc<0.0){System,out.printin(''Complexroots:஻+pl+஻+or-"+p2+஻i");}else{xl=pl+p2;x2=pl-p2;System,out.printin(zIFirstRealroots/z+xl);System,out.printin(^Secondrealroots:Iz+x2);))}//endfor))5ஹ?j40kFibonacciᦪᑡ஺Fibonacciᦪᑡ1,1,2,3,5,8,13,21,34,…KᦪᑡoᑮFl=l(n=l)

45F2=l(n=2)Fn=Fn-l+Fn-2(n23)publicclassFibonacci{publicstaticvoidmain(Stringargs[])(longfl,f2;inti;fl=l;f2=l;System,out.printin(fl+“"+f2);for(i=3;i<=20;i++){fl=fl+f2;f2=fl+f2;System,out.printin(f1+""+f2);)}}6ஹrstu5ᐗ1vIwu3ᐗ@vIxu1ᐗ3vI⌕?ᵨ100ᐗz{|100vuI}ᨵDᫀ஺publicclassLoop_Loop3_20{publicstaticvoidmain(Stringargs[]){intI.J.K;System,out.printingIK");for(I=0;Iீ=20;I++)//Ituᦪfor(J=0;J<=33;J++)//JwutuᦪK=100-I-J;//Kxuᦪif(5*1+3*J+K/3.0==100)System,out.printin(z/"+I+""+J+""+K);})))7ஹᑨ@kᔲᦻI᝞“rotor"“rotor"Iᡠᦻ.◤▅StringḄ@D஺:

46publicclassRotorpublicstaticvoidmain(Stringargs[]){StringstrB஻rotor”,subl;inti=0,n;booleanyes=true;if(args.length>0)str=args[0];System,out.printin(஻str=஻+str);n=str.length();charchi,ch2;Stringtempi”;for(i=0;ij/2){System,out.printin(஻஻+j+”¢ᦪ஻)7))))

479ஹᙠ@k¥¦§¨ᵨbreak,continue©returnᨵª«¬®ᙠ¥¦§¨ᵨbreak¯°I±¨¥¦²³I´EKbreak¯°ᜐ¶ᑮbreak¯°ᡠᙠḄ¥¦᜜☢Ḅ¹@k¯°º»᡻½஺ᙠ¥¦§¨ᵨcontinue¯°I±¾j¿ÀÁÂ¥¦I´E¶ᑮcontinue¯°ᡠᙠ¥¦Ḅ¹@k¯°º»᡻½஺ᙠ¥¦§¨ᵨreturn¯°I±²³ÃjDÄᵨIŲ³¥¦I¨´EÆᑮÄᵨ¯°Ḅ@k¯°᡻½஺10ஹ¿᪀ᓄEÉÊËᨵÌÍ´E®ÎÏᑖÑÒÓJava§Ô¯°¿᪀ᓄEÉÊËᨵÍÕÁ´E¥¦ஹᑖÖ©×É஺JavaEɧḄᑖÖ¯°ᒹÙif¯°ஹswitch¯°7¥¦¯°ᒹÚÛwhile¯°Ido-while¯°ஹfor¯°7ᐸί°᝞ÝÞஹÒßàáஹâ㯰ஹDÄᵨ¯°ஹäå☢Ḅ¥¦¿᪀ஹᑖÖ¿᪀æᢥ᯿åᦻ᣸ᑡê×ɯ°஺¹ëìí⚪äïὃ⚪1.ª«®ª«Òß®Òß©ª«ᐵò®óôõÛÒßḄᐳ÷ឋ©½ùᡂḄÒßᡈüýḄ“þÿ”஺ḄᐸᡠᐹᨵḄ᝱ᱯ᝱Ḅ!"ᔠᙠ%&ᡠ᪀ᡂḄ)*஺+,-.Ḅᐵ01,ᐹḄᐵ02+⊤4Ḅ%51Ḅᭆ789:+Ḅᐳ<ᱯ=>ᐹ?ᱥ+ABCᩭEᡂ8ᐹᨵFḄ᝱஺GH2+IḄᐵ0J᝞LMḄNOIᢥNOᑴ⌼SḄLMᐵ0%᪵=NOU+V9LMUVḄᐳ<ᱯWXLMUVYᨵFḄXឋ᝞[\]Ḅ^<__2ஹabcdecdḄ"᪀f᪵Ḅeghcdiὃ⇋lmneo2cdJava+Ḅ%Xpᡂqᑖst+ḄcdᦋvḄ᝱஺cdḄ"᪀2wcdx⛲z{|}~+cdUwᑡ⊤{Vthrowsᑡ⊤{Ucd=Vghcdiὃ⇋mnᨵ2
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48(++……)(4)throwsᑡ⊤³9ᙠcd᡻µ¶·¸Ḅ஺3.º»%Xᨵ¼XcdḄ+ᐸ%Xcd¼½¾ᵨ¿Xcd%½^Àᵨthis,¿XÀᵨthis஺classRectangle//Â+(intwidth;//ÂḄÃintusethis(intwidth)஻|}Ã]ḄÅᦪ{this.width=width;஻ᢣFXreturnwidth;intunusethis(intwidth){intw=width;returnw;)publicstaticvoidmain(Stringargsf])(Rectangler=newRectangle();஻+ḄHᓄSystem.out.println("Itisaboutthenodeofthis.");஻ÈSÉSystem.out.println(r.usethis(1));System.out.println(r.unusethis(2));ʵ"¤2Itisaboutthenodeofthis.124ஹº»%X+:+Ëᨵint,char+ḄᡂᕒvÍÎÏÐÑÒᓄᯠÔÕÖÈSᡂᕒvÍḄ~×Øjavaᔲ᡻µ9ÚÛḄÑÒᓄ!஺ὃoᫀ2publicclassCuoShiHua{inta;஻᦮vÍcharb;//zvÍpublicvoidshow()஻ᵨᩭÈSÏÐÑÒᓄḄvÍḄ(System.out.println(a);System.out.println(b);)publicstaticvoidmain(String[]args){CuoShiHuac=newCuoShiHua();//Þß+ḄàHᓄ

49c.show();஻Åᦪ¾ᵨÈS"¤20□஻câã⊤äâ5ஹº»%X+:+åᨵḄᡂᕒvÍ,ᡂᕒcdº»%X:+ḄæØçèNéêᡂᕒèÕëÖìíîSïðñUò2ᙠ<%óô¯Ḅ+õö÷%XÚÛḄᒹV஺classtextlstaticinta;//çÐAstatic+èA+vÍÐᡈ+¾ᵨintb;//vÍù¶Ð¾ᵨpublicvoiddisplay(inta,intb)஻ᡂᕒcd(System.out.println("staticinta="+a);System.out.println("intb="+b);)publicstaticvoiddisplay(intb)(System.out.println("staticdisplay:intb="+b);)publicstaticvoidmain(Stringargs[])(textltt=newtext1();tt.display(5,6);//textl.display(5,6)┯ûḄ2vÍᡈcdù¶Ðtt¾ᵨtextl.display(0);஻çÐAstatic+èA+cdÐᡈ+¾ᵨtt.display(23);tt.a=9;textl.a=4;tt.b=3;ʵ"¤:

50staticinta=5intb=6staticdisplay:intb=0staticdisplay:intb=236ஹ¯☢îS9%XÂ+Rectangle,ᐸåᨵþX᪀⌼cd஺ÿ
ᐸ᪀⌼Ḅᵨ஺importjava.io.*;classRectangle//!"privateintwidth;஻!Ḅ$%privateintlength;஻!Ḅ&%Rectangle()஻!Ḅ'(ᦪḄ᪀⌼*ᦪ+ḕḄ-.&(30)$(20)length=30;width=20;)Rectangle(intl,intw)஻!Ḅ'(ᦪḄ᪀⌼*ᦪ{length=l;width=w;)Rectangle(Rectangler)஻᪀⌼/012Rectangle34(ᦪ(width=r.width();//56789ᵨ*ᦪ▬;-<=>?length=r.length();}intwidth()஻@A$%(returnwidth;)intlength()஻@A&%(returnlength;publicclassCRctnglepublicstaticvoidmain(Stringargs[])

51Rectanglex1=newRectangle();஻BC"Ḅ78DEᓄRectanglex2=newRectangle(50,40);஻BC"Ḅ78GHᓄRectanglex3=newRectangle(xl);System.out.println(xl.length());System.out.println(xl.widthQ);System.out.println(x2.1ength());System.out.println(x2.width());System.out.println(x3.1ength());System.out.println(x3.width());)):302050403020JᐳLMN32᪀⌼JRectangle஺ஹRectangle(intl,intw)ஹRectangle(Rectangler)ᐸRectangle஺PQᨵ(ᦪḄRectangle(intl,intw)/Sᦪ34(ᦪRectangle(Rectangler)P/78ᨬ4(ᦪ஺᪀⌼*ᦪḄ9ᵨDᙠᵨnewVWXY"78Pᵫ[\]^_ᡂḄ᪀⌼*ᦪḄ(ᦪa⌴!DᔠdPᵫ[\ᙠ9ᵨḄe]^_ᡂ஺7ஹf☢-.N12V▤iḄ"Factᵨj"V▤iḄCheckl஺
jḄ(ᦪḄa⌴@A;Ḅᵨ஺ᙠ9ᵨeᦋ>(ᦪḄ2ᦪ"lmm
enᑮpqrs஺classFact(floatfact(intn)஻LMVn!Ḅ(inti;floatx=1;for(i=l;i

52publicstaticvoidmain(Stringargs[]){Factx=newFact();System,out.printin(x.fact(10));஻V10!System,out.println(x.fact(15));஻V15!))J1.0E92.91929271El68ஹ
f☢Ḅᑖ᪆superthisḄᵨw1xᳮz>?◚|}ᑏḄᭆ஺importjava.io.*;classSuperClss஻LM᱄"(intx;SuperClss()஻᱄"Ḅ᪀⌼(x=10;)voiddoClss()System.out.print]n(nSuperClss.doClass()");

53classSubClssextendsSuperClss஻LM"intx;SubClss()஻"Ḅ᪀⌼(super();//9ᵨ᱄"Ḅ᪀⌼x=100;voiddoClss()//}ᑏ᱄"ḄdoClss(System.out.println("SubClss.doClss()n);)voiddoDemo()஻superthisḄ(intx;x=1000;super.doClss();஻9ᵨ᱄"ḄdoClssdoClss();஻9ᵨ"ḄdoClssSystem.out.println(nsuper.x=n+super.x);஻᱄"ḄxSystem.out.println(nthis.x=n+this.x);//"ḄxSystem.out.println("x="+x);//Ḅx

54publicclassSuperDemopublicstaticvoidmain(Stringargs[])஻SubClsss=newSubClss();s.doDemo();JSuperClss.doClassOSubClss.doClss()super.x=10this.x=100x=1000JLMN12᱄""SubClssN᱄"SuperClss,ᙠ*ᦪLMSubClss"78se(ᓽ᡻JSubClsss=newSubClss஺;e),]^9ᵨ"SubClssḄ᪀⌼*ᦪSubClss(),᪀⌼*ᦪᐜ᡻“super()᪵9ᵨ"SuperClssḄ᪀⌼SuperClss(),4superᩭᢣC"Ḅ஺᪵ᙠ"doDemo()᡻"super.doClss();"eᑣ9ᵨ᱄"ḄdoClss()஺᝞ᵨsuperᩭᢣLḄᑣ9ᵨḄP"ḄdoClss(),"SubClss()ḄᡂᕒdoClss()}ᑏN᱄"SuperClss()ḄᡂᕒdoClss()஺

55"System.out.println("super.x="+super.x);“super9ᵨḄP᱄"SuperClssḄ>?x,"System.out.println("this.x="+this.x);"this9ᵨḄ"SubClssḄ>?x,ᐵ¡¢thiss£erᑖ¤ᵨᩭᢣC"᱄"¥Ḅᡂᕒ>?஺᱄"SuperClssḄᡂᕒ>?Xஹ"SubClssḄᡂᕒ>?x"doDemo()ᵨḄ¦§>?x¨ὅ¥ᑣ⌕ᵨᐵ¡¢thissuperᩭᢣLᡠ⌕ᵨḄ>?஺᝞ᵨᑣ¬.Ḅ"Ḅ¦§>?᝞wSystem.out.println("x="+x);w¬.ḄP"doDemo()Ḅ¦§>?஺"SubClss()Ḅᡂᕒ>?x◚|N᱄"SuperClss()Ḅᡂᕒ>?x஺9ஹ
f☢Ḅᑖ᪆ᐸ}Ḅᵨw1xᳮz}Ḅᭆ஺classFather஻"Ḅspeak}N®¯(voidspeak()஻°(ᦪḄspeak(System.out.println(MIamFather!");}voidspeak(Strings)஻ᨵ(ᦪḄspeak(System.out.println("Ilike"+""+s+".");})publicclassOverLoadingDemo{publicstaticvoidmain(Stringargs[]){ூFatherx=newFather();x.speak();//9ᵨ°(Ḅspeakx.speak("music")஻9ᵨᨵ(Ḅspeak:

56IamFather!Ilikemusic.³´µ¶⚪¸¹ὃ⚪1ஹpqP?pqP᱄"?pqP"?Ḅᱯឋ¾-☢ᔣ78
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576ஹ>?8ᒹ?Ḅᵨ8>?STUᒹ8-ᦣḄḄᔠ஺ᒹḄᵨ⌕8W◤⌕¡6¢Ḅ*6Ḅ£¤ᙠ-¥¦FGYZ§¨ஹ©᪀ᑖ¬஺7ஹCLASSPATH8ᨵᐵ>?Ḅ¶᛻¸¹?᝞º»FGḄ¼½S᝞H¾[¿ᦋ;¶᛻¸¹STUCLASSPATH8ᢣÁḕḄᒹᦻ(Å⁚ṹᦻ)ÈÉḄ¶᛻¸¹஺᝞ÊCLASSPATHH¾¦*ËÌᑣFGÎÏஹ¼½tZÐ*ᑮᡠ◤ḄḄÅ⁚ṹᦻFGÓËÔ¼½஺ᵨ᝞dÕH¾ᡈ¿ᦋCLASSPATHUSETclasspath=,;d:\jdkl.5.O\lib\ext8ஹ-;᝞`a{ïS`a{ïḄ8ᔲ-⌕7ñ{ï,ḄᡠᨵXESTUᵨᐵòÅimplementst`a{ï஺`a{ïḄ᝞Ê*8XEᑣ◤⌕õö7ᩭ`añ{ï,ḄᡠᨵXE᝞Ê;8XEᑣt*÷`añ{ï,ḄᡠᨵXE஺9ஹJẆúᡠÎᑏ-;õᵨFGᵨᩭIüý-þõ¢ᐹ¼½1000
ᡠ◤ḄᐹḄᦪ3᦮ᦪAஹBஹCḄ⊤஺ᨵ"ᐹ:Car007'Plane,ᐸ.Car007Ḅ/012
34A*B/C,PlaneḄ/012
34A+B+C஺◤⌕:ᑏ<=:ComputeTime.java,Plane,java,Car007.java'HICommon,java,⌕JᙠLᩭ᝞OPQR3ᐹḄ᎛TUVᦋXYḄZ[\]^◤⌕:ᑏ_ḄᐹḄ\]஺ᐸ1`a\᝞bcde`fᐭComputeTimeḄhᦪRiᐹḄ=jRkஹ<ஹhᦪᑖm᦮ᦪAஹBஹC,no᝞b4p2PlaneḄ4"javaComputeTimePlane203040"p2Car007Ḅ4"javaComputeTimeCar007233445”᝞OR3ᐹ3Ship,ᑣ^◤⌕:ᑏShip,java,1`fᐭ4”javaComputeTimeShip223344஻z{4ᐙᑖᑭᵨHIḄᭆHIᐙᦪ஺oᓄiḄ᜜i4Class.forName(str).newlnstance()o᝞◤⌕oᓄiPlaneḄᑣ^⌕ᵨClass.forName(zzPlanez).newlnstance஺஺4ComputerTime,java\]4importpkgl.pkg2.*;importjava.lang.*;publicclassComputerTime{publicstaticvoidmain(Stringargs[]){System.out.printin(஻ᐹ4஻+args[0]);System.out.printin(zᦪA:஻+args[l]);System.out.printin(zᦪB:"+args[2]);

58System.out.printin(zᦪC:஻+args[3]);doubleAkDouble,parseDoub1e(args[1]);doubleB=Double.parseDouble(args[2]);doubleC=Double.parseDouble(args[3]);doublev,t;try{Commond=(Common)Class.forNameCzpkgl.zz+args[0]).newlnstance();v=d.runtimer(A,B,C);t=1000/v;System,out.printin(“¦ᙳ/04"+v+"km/h");System,out.printin(஻1`4஻+t+”¨஻)}catch(Exceptione){System,out.printlnC'classnotfound");}})ᒹpkgl.Car007.javaḄ\]4packagepkgl;importpkgl.pkg2.publicclassCar007implementsCommon{publicdoubleruntimer(doubleA,doubleB,doubleC){System,out.printin("runtime="+(A*B/C));returnA*B/C;))ᒹpkgl.Plane.javaḄ\]4packagepkgl;importpkgl.pkg2.publicclassPlaneimplementsCommon{publicdoubleruntimer(doubleA,doubleB,doubleC)(returnA+B+C;)

59ᒹpkg2.Common,javaḄ\]4packagepkgl.pkg2;publicinterfaceCommon{doubleruntimer(doubleA,doubleB,doubleC);}10ஹ:ᑏJ®[¯°(᝞±²ஹ<³°´jᙊ¶·j)Ḅᕜ¹☢»Ḅ¼ᵨ\]⌕Jᵨᑮ¾¿'HIÀᢈÂ஺4//Solutionofdrawingsastriangle,rectangle,circleimportjava.io.*;//interfaceinterfacegetProperty(doublePi=3.1415926;doublegetAreaO;doublegetCircumO;StringgetName();)//classmpoint(staticinti=0;doublex,y;Stringstrmpoint;mpoint(doublea,doubleb)(this.x=a;this.y=b;)doublegetX(){returnx;)doublegetY()returny;

60StringgetStringO(i+=l;strmpoint=/mpoint/+i;//nameofampoint;returnstrmpoint;))//dispclassclassdisp{doublearea;doublecircum;StringdrawingName;disp(doublea,doubleb,Stringss){this.area=a;this.circum=b;this.drawingName=ss;)publicvoiddisplay(){System.out.println(z/Drawingisz+drawingName);System,out.printin("Area="+area+“Circum=஻+circum);))//classtriangleclasstriangleimplementsgetProperty{mpointpl,p2,p3;doublesi,s2,s3;StringdrawingName஻Triangle";triangle(mpointpl,mpointp2,mpointp3){this.pl=pl;this.p2=p2;this.p3=p3;this,si=Math,sqrt((pl.x-p2.x)*(pl.x-p2.x)+(pl.y-p2.y)*(pl.y-p2.y))this.s2=Math.sqrt((p3.x-p2.x)*(p3.x-p2.x)+(p3.y-p2.y)*(p3.y-p2.y))this.s3=Math.sqrt((pl.x-p3.x)*(pl.x-p3.x)+(pl.y-p3.y)*(pl.y-p3.y))publicdoublegetArea(){

61doubless,ssa;ss=(sl+s2+s3)*Pi/2.O/Pi;ssa=Math.sqrt(ss*(ss-sl)*(ss-s2)*(ss-s3));returnssa;)publicdoublegetCircumO{returnsl+s2+s3;)publicStringgetName(){returndrawingName;)publicbooleantlineO{returntrue;)}////circleclassclasscircleimplementsgetProperty{mpointpl;doubleradius;StringdrawingName஻Circle”;circle(mpointpl,doubleradius){this.pl=pl;this.radius=radius;)publicdoublegetAreaO{doublessa;ssa=Math.PI*radius*radius;returnssa;)publicdoublegetCircumO{returnMath.PI*2.0*radius;)publicStringgetName(){returndrawingName;)publicbooleantcircle(){returntrue;

62//classrectangleclassrectangleimplementsgetProperty{mpointpl,p2;doublesi,s2;StringdrawingName="Rectangle”;rectangle(mpointpl,mpointp2){this.pl=pl;this.p2=p2;this,si=Math,sqrt((pl.x-p2.x)*(pl.x-p2.x));this.s2z=Math.sqrt((pl.y-p2.y)*(pl.y-p2.y));)publicdoublegetArea(){returnsl*s2;)publicdoublegetCircumO(returnsl+s2+sl+s2;)publicStringgetName(){returndrawingName;)publicbooleanrline(){returntrue;))//mainclassclassdrawingextendsdisp{drawing(doublea,doubleb,Stringss){super(a,b,ss);)publicstaticvoidmain(Stringargs[])throwslOException{BufferedReaderkeyin=newBufferedReader(newInputStreamReader(System,in));Stringstrxx;for(;true;){System,out.print(zInputstringlikeTriangleஹRectangleorCircle:");

63strxx=keyin.readLineO;if(strxx.length()=0)continue;charcharxx;charxx=strxx.toUpperCase().charAt(0);switch(charxx)(caseT://trianglestart//3pointgetSystem,out.printIn("'Pleaseinput(triangle)1pointx(enter)y(enter)/z);mpointpl=newmpoint(aVar(keyin),aVar(keyin));System,out.printin("Pleaseinput2pointx(enter)y(enter)z/);mpointp2=newmpoint(aVar(keyin),aVar(keyin));System,out.println(Pleaseinput3pointx(enter)y(enter);mpointp3=newmpoint(aVar(keyin),aVar(keyin));//tltriangletl=newtriangle(pl,p2,p3);//dispdisptdisp=newdisp(tl.getAreaO,tl.getCircumO,tl.getNameO);tdisp.display();//mpointpl=p2=p3=null;//disptdisp=null;//triangleendbreak;//------------------------------------------------------------------------------case'C'://circlestart//1pointgetSystem,out.println(zPleaseinput(circle)centerx(enter)y(enter)z/);mpointp4=newmpoint(aVar(keyin),aVar(keyin));System.out.println(Pleaseinputradiusx(enter)z);doubleradius=aVar(keyin);//t2circlet2=newcircle(p4,radius);//disp

64dispcdisp=newdisp(t2.getAreaO,t2.getCircumO,t2.getNameO);cdisp.display();//circleendbreak;//-------------------------------------------------------------------------------case'R'://rectanglestart//2pointgetSystem,out.printIn(/zPleaseinput(rectangle)1pointx(enter)y(enter)z/);mpointp6=newmpoint(aVar(keyin),aVar(keyin));System,out.printIn(Z/Pleaseinput2pointx(enter)y(enter)zz);mpointp7=newmpoint(aVar(keyin),aVar(keyin));//t3rectanglet3=newrectangle(p6,p7);//dispdisprdisp=newdisp(t3.getAreaO,t3.getCircumO,t3.getNameO)rdisp.display();//circleendbreak;//---------------------------------------------------------------------------------default:System,out.printIn(zError!pleaseinputt(T),c(C)orr(R);஻)}//switch}//endoffor}//mainmethodstaticdoubleaVar(BufferedReaderkeyin)throwslOException{//getadoublevarStringxx;xx=keyin.readLineO;returnDouble.parseDouble(xx);)

65RÒÓÔ⚪Ö×ὃ⚪a)ÙÚXbᨵÛ⚪ḄÜṹpulicintsearchAccount(int[25]number){number=newint[l5J;for(inti=O;i

66{sum=sum4-Double.valueOf(args[i]).doubleValue();)n=sum/args.length;System.out.println("ᙳᦪ:"+n);))ᵨ!"Ḅmain#$"Ḅ%ᦪargs&'()ᐭḄ*+.✌ᐜ./012!D:\>javacExample5_5.java./345)⌕7ᵨ8ᘤjava.exeᩭ᡻<)Ḅ⁚ṹᦻ@D:\>javaExample5_5"123.78"23324.9""213214"(AB)DED!"Ḅargs[O],arg[l],argফᑖHIᑮ*+"123.78",”23324.9"K"213214”.ᙠ2!"ᡃNODP*+QᓄSᦪTU

67while(fenxi.hasMoreTokens()){Stringstr=fenxi.nextToken();System.out.println(str);System.out.prtln(“sᒕ"+fenxi.countTokens()+”ᓫh”)d)System.out.printingsᐳᨵᓫh”+number+"");)}6ஹ7ᵨjava.langᒹ"SystemzḄ☟᝱#$arraycopy}~ᦪ]ḄclassArrayCopy{publicstaticvoidmain(Stringargs[]){chara1[]={aVb7c','d''e',,f'},b1[]={,1',2,3,4,5,6};,System.arraycopy(a1,0,b1,1,a1.length-1);System.out.println(newString(a1));System.out.println(newString(b1));byte32[]={97,98,99,100,101,102}^2[]={65,67,68,69,70,71);System.arraycopy(b2,0,a2,3,b2.length-3);System.out.println(newString(a2));System.out.println(newString(b2));))7ஹV<☢!fZ[publicclassExample4{publicstaticvoidmain(Stringargs[]){byted[]=")ᡃ”.getBytes();System.out.println("ᦪ]dḄ(\ᓰ⁚):”+d.length);Strings=newString(d,0,2);System.out.println(s);))01!ḄfZ[ᦪ]dḄ(\ᓰ⁚)6)⚪ὃ⚪1ஹ.ᑏᑨᔲḄJava!஺:publicclassDatelintyear,month,day;

68voidsetdate(inty,intm,intd)஻ᡂᕒ#$µ¶·¸T{஻ºᨵḄ»¼ATᨵ½%ᦪyear=y;month-m;day=d;)booleanisleapyear()஻ᑨÀᔲS(஻ÁÂüAT»%ᦪreturn(year%400==0)|(year%100!=0)&(year%4==0);)voidprint()஻f·¸T»¼AT,»%ᦪ(System,out.printinC'dateis஻+year+'-'+month+-'+day);)publicstaticvoidmain(Stringargs[])(Datela=newDatel();//ÓÔÕÖa.setdate(2002,4,18);஻Ùᵨz#$a.print();System,out.printin(a.year+zisaleapyear,z/+a.isleapyear());})2ஹÜÝf(n)ºß᝞f(l)=f(2)=lán=L2f(n)=f(n-l)+f(n-2)án>=3kWf(28)ḄZ[åækWçºßᡠèḄEéᦪ஺(êë}~ᵨSystemzḄ☟᝱#$publiclongcurrentTimeMi11is()îïðjáñEéò}~᪷ôcurrentTimeMillis()#$IᑮḄᦪᵨDateḄ᪀⌼#$)importjava.util.Date;classExample6_2{publicstaticvoidmain(Stringargs[]){longtimel=System.currentTimeMillisO;Datedate=newDate(timel);System,out.printin(date);Strings=String.valueOf(timel);intlength=s.length();s=s.substring(length-8);System.out.printin(s);

69longresult=f(28);System,out.printin(result="/+result);longtime2=System.current?imeMi11is();//kWf(28)þ5ḄEé.s=String.valueOf(time2);length=s.length();s=s.substring(length-8);System,out.printin(s);System,out.printingᵨE”+(time2-timel)+"ÿ஻);)publicstaticlongf(longn){longc=0;if(n==l||n=2)c=l;elseif(n>=3)c=f(n-l)+f(n-2);returnc;))3ஹᑭᵨVector"#$%&'ᐜ)ᐜ*+ᑡ஺./importjava.util.*;importjava.io.*;publicclassQueue{publicstaticvoidmain(Stringargs[]){VectortheVector=newVector();஻<=&>ᔣ@$AtheVectorbytebytebuffer[]=newbyte[10];try(System,out.print(z#pleaseinputthelengthoftheQueue:");஻HI+Jsize,ᓽᔣ@$AtheVectorḄᜧNSystem,in.read(bytebuffer);Stringc=newString(bytebuffer);intsize=Integer,parselnt(c.trim());System.out.println(z/pleaseinputtheelementoftheQueue:");஻Qᔣ@RSᐭUV#ᓽᐭ+for(inti=0;i

70for(inti=0;ijavaQueuepleaseinputthelengthoftheQueue:3pleaseinputtheelementoftheQueue:563ertet23.34OutQueueNumber:0OutQueueElement:563OutQueueNumber:1OutQueueElement:ertetOutQueueNumber:2OutQueueElement:23.344ஹyzNᑮᜧḄdᦪ30'|ᐭᦪ}R஺./publicclassPrimearray(publicstaticvoidmain(Stringargs[])finalintMAX=100,SIZE=30;intprime]]=newint[SIZE];inti,j,k,n;prime[0]=2;஻ḄᨬNdᦪn=l;஻dᦪ'ᦪ,ᓽᦪ}Ḅ$▭Jᐗd'ᦪi=l;஻l&'dᦪ|Ḅᦪ}l᪗k=3;஻zᨬN᜻ᦪ,ᡠᨵᏔᦪ◤doj=0;while((j

71prime[i]=k;i++n++;)k=k+2;஻l&'᜻ᦪᔲdᦪ}while(k

72}for(inti=0;i<6;i++)(System.out.printin('

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74U☢ḄWXU〉ᔠYᵨᔣ1(D◤⌕ᜐᳮḄBCᦪ^#_15ᑡḄᐗ@A2BC:ᡈbc⊤efBC஺(2)◤⌕i#$ḄBCᔠᡂG>ᦪ85ᑡ஺(3)◤⌕l⚣nḄBC5ᑡᐗ@Ḅopᑤ◀஺(4)t◤⌕_u5ᑡḄBCᡈᐸwḄxyz{஺(5)◤⌕ᙠ#$Ḅ;~⌴ᜧḄᦪ8஺(6)VectorḄB,ᦪ⌕GH:2Yᵨ>ᨵG_Ḅ▲ឋ:᝞ᐸḄBC#K2ᓫᦪ8P஺GᙠU☢ḄWXU:Yᵨᦪᔠ〉(1)5ᑡḄᐗ@2ᓫᦪ8PḄᦪ8(2)5ᑡḄᐗ@ᦪ^B_:oᐭஹᑤ◀pxyz{஺10ஹ-.2᣸5?¡¢£᣸5?&'ᔜ¥ᨵ-.¦§¨0ᑖ)〉ᔠᙠ-.WXUYᵨ01᣸52©G>ᦪ85ᑡḄᔜ>ᦪ8ᐗ@:᪷8ᐸᡠᒹḄ¬>ᐵ®¯°±ᜧᑮ³ᡈ±³ᑮᜧ᣸ᑡḄ´µ஺᣸5Ḅ^ḄᜧA2f¶Bᦪ85ᑡḄᐗ@¯°xy஺·Ḅ᣸5ᨵ1ᑈ¹᣸5ஹ⌱»᣸5ஹoᐭ᣸5ஹ᫜᣸5p½¾᣸5஺ᐸᑈ¹᣸5Ḅp¿ṹᓫ:〉ᔠᙠÁ᣸5Ḅᦪ8ᐗ@ᦪ^#ÂḄWX:ᐸÃᩖÅfn\⌱»᣸5poᐭ᣸5Ḅ¿Èfn2,ᜧᜧÊ:ᐸ⌱»᣸5ᡠ◤Ḅz{:ËÌz{:Íoᐭ᣸5Ḅz{:ËÌz{:ÎᔠÏᩭÑὅᜧÓ#ÔU஺᫜᣸5ḄÃᩖឋfn,ᨬ³:2¿È2ᓰᵨḄᑁ6Ø~(10n)஺½¾᣸5ḄÃᩖឋ2n஺◤⌕ÙÚḄ2:ÛÃᩖឋᢣÝḄA2ᙠᨬÞWXUḄ:ß▭Yᵨábc᪷8◤⌕᣸5Ḅᦪ8ᐗ@¥âḄᱯ¨:᝞2ᔲåtæᑖᨵ5:ᩭ⌱»çḄ஺èéêë⚪íîὃ⚪1.-.2ñ0òJavaḄñᜐᳮöᑴ஺ø1ñ2ùµ5°Ḅá᎛:ᵫ,ᔜ£#büýḄþLÍÿḄ┯஺᝞◀ᦪஹᦻᑮᑏஹ஺Java!"#$ᔜ&'()*Ḅ┯+,-./0Java12Ḅ./34ᜐᳮ7ᑴ9./ᜐᳮ஺Java12:;&<Ḅ./=)7ᑴ>throws=)./Ethrow=)./஺throws=)./F9G=)./0throw=)./F9H=)./஺throws=)./EIJKὶMᙠOP0Q┐STU34>VᵨḄI=):./ஹXYᑮ:┯Z[ᵨthrow\]=)./ஹ^ṹᨵ┯a./஺I$)*Ḅ./ᵫcatch\]ᣓe0f#ᜐᳮ஺

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76System,out.printin("ᦪíîï>"+e);)finally(System,out.printin("End!

77");)))ò⚪:ᙠjavaḄ./ᜐᳮ7ᑴ$0tryᙽஹcatchᙽEfinallyᙽᔜP}lj÷ø-ᵨq"#ùú>***./ᜐᳮYß***num=0◀>java.lang.ArithmeticException:/byzeroEnd!***./ᜐᳮYß***num=100ᦪíîï>java.lang.ArrayIndexOutOfBoundsException:100End!***./ᜐᳮYß***num=lEnd!ò⚪tᫀ>Tryᙽ-ᵨ>JK=)./Ḅýþ0ºýþÿᨵ
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Ḅᣓᜐᳮ஺catch☢Ḅtryᙽ#$%&'(try-catch*+,-ᙠtryᙽ/☢Ḅᔜ(catchᙽ#1234ᓛ6Ḅ7ᦪ஺7ᦪ9ᔠ;<3(ᩩ?@'A*BCD(7ᦪ2E%Ḅ4ᓛ6:7ᦪ2E%ḄGH'(I7ᦪJE%ḄḄ᱄I7ᦪJ'(LAE%ḄMN&D'L஺E%Ḅ1ᑮ&P'(2@4ᓛ6Ḅ7ᦪA*᡻ᒹSD'7ᦪḄcatch#ḄjavaVṹ஺Finally\ᵨfinally^;_JCᜐᳮ`?abḄ'(cᳮdᑴ'fJᵨᩭᐵiᦻ?ᡈlmᐸoḄpqrs஺Ctry-catch-finallyt᪀Ḅ'vᑖ^;xᨵfinally᝞z{ᙠfinally|}tryᙽ#Jᔲ$%&Jᔲ᡻catch⌕᡻finally஺4.ᑏᐭ10(9mᐭ'(9ᦪᙠḄ஺ᜐᳮᦪ.

78importjava.io.*;classReadCharpublicstaticvoidmain(Stringargs[])throwslOException(charbuf[]=newchar[10];஻10⁚ḄᦪᵨH{9²bufC³v´µSystem,out.println(zInput10char!");charch;for(inti=0;i<10;i++)buf[i]=(char)System,in.read();஻'(ᦪ²½{Hbuf#¾$for(intj=0;j<10;j++)System,out.print(buf[j]஻);))¿tzD:\java\pro>javaReadCharInput10char!uiwryiufysuiwryiufysPÃÄÅ⚪ÇÈὃ⚪1ஹ'(ËᵨᢥÍᙢÏ'(^ᦻ?ḄᑁÑ஺Òimportjava.io.*;publicclassReadFile{publicstaticvoidmain(Stringargs[]){Strings;FilelnputStreamis;InputStreamReaderir;BufferedReaderin;try{is=newFilelnputStream(zbbs.txtz);ir=newInputStreamReader(is);inÕnewBufferedReader(ir);while((s=in.readLineO)!=null)System,out.printin("Read:஻+s);

79catch(FileNotFoundExceptione){System,out.printinC'Filenotfound!z);System,exit(-2);}catch(lOExceptione){System,out.printin("Error:஻+e);System,exit(-3);))2^ÜHashtable{mḄÞßàᑮáᦻ?#â#Hashtable.importjava.io.*;importjava.util.Hashtable;publicclassObjectlOClassextendsimplementsSerializable{publicstaticvoidmain(Stringargs[])throwsException(Hashtableht=newHashtable();஻ãäHashtableḄåæMçDatalnputStreamdisÕnewDatalnputStream(System,in);஻ãäDatalnputStreamåæè2஻᪗êàᐭåæë஺Stringst_no=dis.readLineO;஻᪗êàᐭ'{ᐭst_noStringstrec=dis.readLine();஻᪗êàᐭ'{ᐭstrecht.put(st_no,st_rec);//st_noᐵst_recCHashtable½{Ḅåæ{ᐭhtSystem,out.println(ht);Stringst_nol=dis.readLine();஻᪗êàᐭ'{ᐭst_nolif(ht.containsKey(st_nol))//᝞Hashtableåæ#ᨵst_nol,ᡭᓺåËḄåæSystem.out.printin(ht.get(s3));elseSystem.out.printin("error");ObjectReadWritemyobject=newObjectReadWrite();஻ãäᦻ?åæmy_object.write(ht);஻᝞htåæàᑮàsmy_object.read();஻àᐭsᐭåæ})publicclassObjectReadWrite{staticFileobject_file=new"data");publicstaticvoidwrite(Hashtableht){try(஻ãäFileOutputStreamåæè2ᦻ?åæobjectfileë

80FileOutputStreamfos=newFileOutputStream(object_file);//ãäObjectOutputStreamåæè2ᦻ?åæfosëObjectOutputStreamoos=newObjectOutputStream(fos);oos.writeObject(ht);஻HashtableåæᑁÑᑏᐭàᦻ?#//ol.flush();oos.close();}catch(Exceptione){);}publicstaticvoidread(){஻åæàᐭᦻ?#åætry(஻ãäObjectOutputStreamåæè2ᦻ?åæobjectfileë஺ObjectlnputStreamois=newObjectInputStream(newFileInputStream(object_file));Ilashtablehtl=(Hashtable)ois.readObject();஻àᐭsᐭåæSystem,out.printin(ht1);//᪗êàhtl}catch(Exceptione){e.printStackTrace();)))3ஹᑭᵨStringBufferᑏᐭ9²ஹ᦮ᦪஹMöᦪᙠà஺simportjava.io.*;publicclassStringBufferToString{publicstaticvoidmain(String[]args)throwslOException(charch;StringBufferstrb=newStringBuffer();஻÷ã'(øḄStringBufferSystem,out.printin(zpleaseEnterthechar,intnumberorfloatnumber:z);while((ch=(char)System,in.read())!='

81')(strb.append(ch);஻Ü9ëᑮ²ù}Stringstr=strb.toString();஻ÜStringBufferúᣚCStringSystem,out.printin(zthedatayouhavebeenentered:");System,out.println(str);

82))4ஹüýþÿ
Ḅᑖ“”ᳮᩩ“⍝”஺ᩩ“⍝”ᨵᦪ(!"ᐭᦪ$)ᡈᦪ'(!"(ᦪ$))*+,-.)*஺ᙠᦪᡈ0ᦪ')*Ḅ+“⍝”ᙠ1/ᑏᦪ$4567ᦪ8ᦪ'Ḅ9᪵ឋ+<ᓄᣵ?ᦪ8ᦪ'Ḅ9᪵ឋ@ᩭḄᦪ1/ᑏḄBᩖឋDEᙠ-.)*Ḅ+“⍝”FGH"ᐭ/"(ḄIJ☢஺᪷MḄᦪN"ḄOᔣ+ᑖ"ᐭ8"(D᪷“⍝”QRḄᦪḄS+ᑖTU8T⁚D᪷ḄWXOY8Z[\ᳮ+ᑖ⁚]^_஺5ஹbᑏcdᦻfghឋ(᝞jkᦻfḄlmஹnolmஹjkᦻf0ᔲᑏஹjkᦻf0ᔲ1ஹjkᦻfḄᜧrshឋ)Ḅ-.஺importjava.io.*;publicclassFileinfo(publicstaticvoidmain(String[]args)(System,out.printin("enterfilename:");charc;StringBufferbuf=newStringBuffer();try{while((c=(char)System,in.read())!='

83')buf.append(c);஻"ᐭḄTUᑮbufM+ᑮ⍗¡¢U}catch(java.io.lOExceptione)(System,out.printlnC'Errorr^+e.toString());}Filefile=newFile(buf.toString().trim());஻ªWFileḄfileo«if(file.exists())஻᝞¬ᦻfᙠ!®¯°ᙠ(System,out.printin(Z/FileNamei^+file.getName());஻jkᦻfḄᦻf³

84System,out.printIn("path:஻+file.getPath());஻jkᦻfḄlmSystem,out.printin(+zAbs.path:"+filegetAbsolutePath());஻jkᦻfḄnolmSystem.out.printIn(^Writeable:+z+file.canWrite());஻jkᦻf0ᔲᑏSystem.out.printIn(+zReadlable:+z+file.canRead());//jkᦻf0ᔲ1System,out.printin("Length:"+(file,length())+஻B஻);஻jkᦻfḄᜧr)else஻᝞¬ᦻf»ᙠ!®¯System,out.printlnC'Sorry,filenotfound.+z);஻jkᦻf¼ᨵ½ᑮḄFk<¾))6ஹᑭᵨRandomAccessFilebᑏ6ᵨ-.+⌕Ã"ᐭ10ÆᦪᑮᦻfM+ÇÆᦪ1᦮Éᦪ8ÊËÌᦪ+ᯠÎÏÐÑᦋᦻfḄÓÆᦪ+ÔjkÑᦋḄÕ¬஺importjava.io.publicclasstestRandom2{publicstaticvoidmain(Stringargs[]){try(RandomAccessFilerf=newRandomAccessFile(//rtest.datz+,"rw");for(inti=0;i<10;i++){rf.writelnt(i);rf.writeDouble(i*l.414);)rf.close();rf=newRandomAccessFile(z+rtest.datz+,஻rw஻)Drf.seek(5*(4+8));rf.writelnt(47);rf.writeDouble(47.0001);rf.closeO;rf=newRandomAccessFile(z*rtest.dat/\஻r஻)Dfor(inti=0;i<10;i++){System,out.printIn(z+Value஻+rf.readlnt()+஻:"+rf.readDoubleO);

85rf.close();}catch(lOExceptione){System,out.printin(e.toStringO);}))7ஹ᝞ÞßÆ»àSḄᦪᑭᵨDatalnputStream8DataOutputStreamᑏᐭᦻf+ᯠÎáᦻfM1(஺ßÆᦪ᝞Þ{19.99,9.99,15.99,3.99,4.99};{12,8,13,29,50);{“JavaT-shirt","JavaMug","DukeJugglingDolls","JavaPin","JavaKeyChain”}importJava.io.*;publicclassDatalOTest(publicstaticvoidmain(String[]args)throwslOException(஻ªWᦪ"(DataOutputStreamout=newDataOutputStream(newFileOutputStream(^content.txt"));஻éêᓄ"(ᦪdoublet]prices={19.99,9.99,15.99,3.99,4.99};int[]units={12,8,13,29,50};StringE]descs={“JavaT-shirtz+JavaMug஻+“DukeJugglingDolls”,“JavaPin஻+“JavaKeyChain”}D஻ᦪ"(for(inti=0;i

86out.writeChars(descs[i]);out.writeChar(J

87+);)஻ᐵìᦪ"(out.close();஻ªWᦪ"ᐭDatalnputStreamin=newDataInputStream(newFilelnputStream(^content.txt஻))Ddoubleprice;intunit;Stringdesc;doubletotal=0.0;try(஻ᑭᵨᦪ"ᐭ1ᦻfᑁîwhile(true)(price=in.readDoubleO;in.readChar();//throwsoutthetabunit=in.readlnt();in.readChar();//throwsoutthetabdesc=in.readLine();System,out.printin("You'veordered஻+unit+஻unitsof஻+desc+஻at$"+price);total=total+unit*price;))஻ᣓòóôcatch(EOFExceptione)(e.printStackTrace();)System.out.println(z+ForaTOTALof:$஻+total);஻ᐵìᦪ"ᐭin.close();)

888ஹᑭᵨBufferedReader8BufferedWriterᙠᦻfMõö"ᐭ"(TU÷஺importjava.io.*;publicclassko24_6{publicstaticvoidmain(Stringargs[])throwslOException(Stringline;Stringstr=஻Acharacterstream.;BufferedWriterkow=newBufferedWriter(newFileWriter(஻ko24_6.out"));kow.write(str,0,str.length());kow.flush();BufferedReaderkor=newBufferedReader(newFileReader(Z/D:/jtemp/ko24_6.out"));line=kor.readLineO;System,out.println(line);))9ஹùú0^_+Ôûü^_ᙠ1/ᑏᦪḄà$oᦪýþᜐᳮ
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ÐAÔ»Ḅ¶"ᓄ(Serialization)஺¶"ᓄḄÜḄj@javaḄÝ"Þ᛻àᱯឋ
ᐸâ⌕ãäjᑏE»]_åæḄᦪÚ஺✌ᐜ[ç¶"ᓄ»publicclassStudentimplementsSerializable{intid;஻êStringname;஻ìíintage;஻îïStringdepartment஻ð?publicStudent(intid,Stringname,intage,Stringdepartment){this,id=id;this,name=name;this,age=age;this,department=department;))ᐸòj᪀⌼»ḄCᐭ/CEjava,ioᒹY
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zLiuMing”,18,஻CSD஻)FileOutputStreamfo=newFileOutputStream(zdata.ser/z);஻$%&'Ḅ)᝱ObjectOutputStreamso=newObjectOutputStream(fo);try{so.writeObject(stu);so.close();}catch(lOExceptione){System,out.println(e);}FilelnputStreamfi=newFilelnputStream(zdata.serz);ObjectInputStreamsi=newObjectInputStream(fi);஻ឮ6&'Ḅ)᝱try(

90stu=(Student)si.readObject();si.close();}catch(lOExceptione){System,out.println(e);7ᓝ9:⚪<=ὃ⚪1.?@ABCDEFGḄHIA?@DBCᨵKL)᝱DMN)᝱OᓄQᵨḄST஺VWBCAXYZCᙠ᡻]^C_FGḄ`ᩩ᡻]Bb஺cYBCᨵEFGஹ%ᙠefgḄ^CAh᝱Ḅ஺BCᵫBCᑁ᪶&'eBCᚮ᪘noᑖqᡂs&tqᡂZCḄᑁ᪶&'

91left=newLefthand0;஻cO஺right=newRighthand();left,start();஻;<Lefthand+Ḅrun!᡻<஺right,start();))classLefthandextendsThread//lefthandThread(publicvoidrun()(for(;;)(System,out.printin("C1fghNi");Try(sleep(1000);஻MṑḨ1f}catch(InterruptedExceptione){}//ᣓᣍ¢}))classRighthandextendsThread(publicvoidrun()(for(;;)(System,out.printin("C3fghNi!");Try(sleep(3000);)catch(InterruptedExceptione){})

92;<6%l(8NᑡB@¤)C1fghNiC3fghNiC1fghNiC1fghNiC3fghNiC1fghNiC1fghNiC1fghNiC3fghNiC1fghNiC1fghNiC1fghNiC3fghNiC1fghNiC1fghNiC1fghNiC3fghNiC1fghNiC1fghNi3ஹcOCOᡭᓺ§¨©ªṑḨ«ᐸ®᡻<Ḅ¯°±²⌕ᡭᓺ§¨©ªṑḨCOᐳṑḨ5i஺⌕µᑖ·¸ᵨ¹Thread+ºabRunnable»¼c9½ᩭabn஺(ᓽᑏcOn)/*Creatstwothreadsthatwritetheirnamesandsleep.Themainthreadalsowritesits/*nameandsleeps.*/importjava.io.*;publicclassNameThreadextendsThread{inttime;//timeinmillisecondstosleeppublicNameThread(Stringn,intt){super(n);time=t;)publicvoidrun(){for(inti=l;i<=5;i++){System,out.printIn(getName()+z஻+i);

93try{Thread,sleep(time);}catch(InterruptedExceptione){return;})}publicstaticvoidmain(Stringargs[]){NameThreadbonnie=newNameThread("Bonnie”,1000)"bonnie.start();NameThreadclyde=newNameThread("Clyde”,700)"clyde.start();for(inti=l;i<=5;i++){System,out.printin(Thread.currentThread().getName()+z/஻+i);try(Thread.sleep(HOO);}catch(InterruptedExceptione){return;)))ÊᓝNÌÍ⚪ÏÐὃ⚪1ஹÒBAWT,ÒBSwing?klAWT(AbstractWindowToolkit)BJavaB×<5Øᓄ,ÚÛÜḄÝ஺AWTÛÜÞßàḄᵨᡝ»¼â᝞label,button,menu,lists஺ã᜜²ÛÜåᜐᳮ¯ᑴéᢝclipboardÏᦪìíᣚ(datatransfer)®ÏïðñK஺SwingºAWTN᪵óBJavaÛÜô9ïõᵨᡝ»¼ᒹ+Ḅ÷ø¼ùᐹâ஺2ஹAWT+ᒹûÞüýᵨḄâᨵÒᵨ⌶ÿ
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ᢥ(Button)ஹ᪗(Label)⌱᪾(Checkbox)ஹ%&ᑡ⊤᪾(Choice)ஹᑡ⊤᪾(List)ஹᓫ⌱᪾(CheckboxGroup)ஹᓫ/ᦻ᪾(TextField)ஹ3/ᦻ᪾(TextArea)456ᩩ(ScrolIbar);஺AWTᵨContainer>ᩭ@AᨬḄDᘤFᡠᨵHIJKDᘤḄLMNOPQContainer>ḄRSᡈU>ᡠVᡂḄNO஺AWTXYZ[\Dᘤ>஺]^QWindow>`ᐸb\U>ஹFrame>ஹDialog>4Panel>஺◀ZAWTXYḄDᘤ᜜FApplet>iQj\DᘤF]QPanel>Ḅj\U>஺ᵨᡝlmḄn\oLMPpᨵ]^qrḄsᓫᩩFn\sᓫᩩHIᨵj@ᦪuḄsᓫFsᓫvHIᨵqrḄsᓫ⚗஺AWTXYZjx>ᵨyzxF]^ᑖ|QMenuBar>ஹMenu>4Menuitem>஺java.awtᒹᒹFᒹ4ᜐᳮᨵᐵḄ>஺᝞ᡃ^☢ᡠᑮḄFQᙠDᘤḄ஺ᡃ^ᨵXᑮn\Dᘤ᝞ᵨᳮᘤ(Layout

94manager)ᩭ¡ᑴ]ᡠᒹḄ£¤4᣸¦஺java,awtXYZ¨\ᳮᘤ>(BorderLayout>ஹCardLaout>;)஺ᵨᡝH᪷ª◤⌕⌱〉¯ḄᳮᘤN°/஺java.awtᒹXYZ¨\>ᩭ⊤±£¤4²³஺S᝞
Dimension>F]ᢣ@Zj\µ²¶·Ḅ£¤¸Insets>F]¹ºᵨᩭᢣ@DᘤḄᕜ¼DᘤḄ½±¶·¾¿ḄÀÁᜧøShape>ᑣᒹZÅஹµ²43¼²஺AWTḄColor>ᙠ⊤±4Æ᦮È⁐Ê☢QᓝᑖᨵᵨḄ஺]@AZjxºuᩭ⊤±ºᵨḄÈ⁐FÌ᝞FColor,black⊤±Í⁐FÎᯠ]ᵨḄÈ⁐QRGB(red-green-blue)ÒÓF]iHIᳮKHSB(hue-saturation-brightness)ÒÓ஺AWTḄImage>XYZÕᦪªḄÖJ⌶Ø஺AppletHI¹ÙAppletḄgetlmageOÊÛÜÝGIF(GraphicInformationformat)4JPEG(JointphotographicExpertGroup)ÕḄNOFáApplet>ᑣHIᵨToolkit>ÜÝ஺Toolkit>┐NAWTḄãäåæឋ,XYZj\áåæyãäḄèM஺QFᜧéᑖêë◀ZÜÝÕ᜜FpìèᵨToolkitNO஺ᵨᡝHIᵨFont4FontMetrics>ᩭ¡ᑴᡠíᦻḄ᜜î஺Font>ᵨᡝHIÜÝᐵyïðḄñòólmôḄïðNO஺FontMetrics>FᵨᡝHIÜÝjxᱯ@ïðᙠ£¤öḄ÷⁚ñò஺ᵨᡝHIᵨComponet>4Graphics>ḄsetFont()ÊÛùj\ᡠᵨḄïð஺ᨬú⌕XᑮḄQGraphics>4Event>஺Graphics>4Event>NyAWTḄí`ᜐᳮûüQáºý⌕ḄFᨵGraphicsNOFêëþpÿ
஺Eventᑣ⊤ᵨᡝḄ᝞ᓫ᪗஺3ஹ#$%&'(#$%)ᡲ&'ᜐᳮ-.(/0ᵨᡝ12Ḅᵨ%345Ḅ3ᵨὅ74589:;<=᝞>3ᵨᡝ12ᐹᨵ<=ABCDEFGᑮ&'ᜐᳮ஺ᡠJ“&'”C%ᢣᙠOPQᨵRSᡃUᡠᐵWḄ&X(᝞0᪗Zᵨᡝᢥ\]R^_)ab]ᯠdOPefgᡃUhᜐᳮiS&X஺i᪵Ḅᭆlmᙠnᵨopᵨᡝq☢s᛻ḄuOPQ%ᓝᑖxyḄ஺zᵨᡝᙠ{'|}(᝞0ᙠ{'ᓫ᪗ᡈᢥ^)C]Event஺Java&'ᜐᳮ-.ᨵ&'ᜐᳮ-.)ᡲ&'ᜐᳮ-.஺ᵫ&'Aab&'javaxn])ᡲᜐᳮᑴ(DelegationModel),&'¡ᙠᐸ£¤ᡠᨵAabḄ&'ᑖ¥ᣴᩗ¨©Ḅ&'ᜐᳮὅᩭᜐᳮ஺᝞ᙠCanvasAab᪗&'®Aab^¯&'°CanvasCᣴᩗ¨&'ᜐᳮὅᩭᜐᳮ᪗&'}ᣴᩗ¨&'ᜐᳮὅ±ᩭᜐᳮ^¯&'஺ᨵ}®²&'ᜐᳮὅ³´µ¶ᘤ¸⌕º®ᙠµ¶ᘤ}»µ¶Ḽ&'ᡠᨵabḄ&'.½°&'.7£¾ᡠ¿ÀᜐᳮḄ&'.ÁCÂ:;ᜐᳮ஺)ᡲ-.¡&'Ḅᜐᳮ)ᡲ¨᜜ÄḄᜐᳮÅÆ:;ᜐᳮÅÇ]²&'µ¶ᘤᑖÈḄᑴ஺&'ᜐᳮὅ(µ¶ᘤ)fx%°᝞>⌕AÉᜐᳮR.Ḅ&'CDEÅÇ7°&'.ÊḄ12஺Ë᝞Ë5.9QButtonHandler8ᡠAÉᜐᳮActionEvent&'ºᙠÕÅÇ]7

95ActionEvent&'ÖḄ12ActionListener஺Ø&'Ùᨵ78ÊÖḄ12஺4ஹÛ4ᒹÝ᪗Þᢥßᓫᢥß}᪗ÞḄᑁáᙠ஻ãä஻஻åy஻89ᑗᣚ஺/0importjava.awt.*;importjava.awt.event.*;classbutimplementsActionListener{Framef;Labellabel;Buttonb;publicvoidbegin(){f=newFrame("LabelandButtonverl.0/z);f.setSize(200,200);f.setLocation(100,100);f.setLayout(newFlowLayout(FlowLayout.LEFT,20,20));label±newLabel("He1lo!஻Label.CENTER);f.add(label);b=newButton("Press");f.add(b);b.addActionListener(this);f.addWindowListener(newWinCloseO);f.setVisible(true);)publicvoidactionPerformed(ActionEvente){if(e.getSource()==b){if(label.getText()==,,Hello!(z)label.setText("Goodbye!”);elselabel.setText("Hello!”);)))classWinCloseextendsWindowAdapter{publicvoidwindowClosing(WindowEvente){System,exit(0);))publicclasswork1{publicstaticvoidmain(Stringargs[])

96{(newbut()).begin();)5ஹ56ᒹ89:;⌱ᢥ>?9:@Aᢥ>(;⌱ᢥ>⌱BC(@Aᢥ>ḄEF⁐H☘⁐,J⌱BCHᮞ⁐஺importjava.awt.*;importjava.awt.event.classchooseimplementsItemListener{Framef;AText]Checkboxc;urnmuButtonb;publicvoidbegin(){f=newFrame("Checkbox");f.setSize(200,200);f.setLayout(newFlowLayout());c=newCheckbox(''ColorChange");f.add(c);b=newButton();b.setBackground(Color.GRAY);f.add(b);c.addltemListener(this);f.addWindowListener(newWinCloseO)Wf.setVisible(true);)publicvoiditemStateChanged(ItemEvente){if(e.getStateChange()==e.SELECTED&&b.getBackground()—Color.GRAY)b.setBackground(Color.BLUE);elseb.setBackground(Color.GRAY);))classWinCloseextendsWindowAdapter{publicvoidwindowClosing(WindowEvente){System.exit(0);))publicclasswork3

97{publicstaticvoidmain(Stringargs[]){(newchoose()).begin();)}6ஹ56ᒹ89:`aᑡ⊤?9:ᢥ>(`aᑡ⊤Bᨵ10ஹ14ஹ18g:⌱⚗஺⌱i10C(ᢥ>BᦻkḄklH10,⌱i14C(ᢥ>BᦻkḄklH14,⌱i18C(ᢥ>BᦻkḄklH18oimportjava.awt.*;importjava.awt.event.classWinCloseextendsWindowAdapter{publicvoidwindo^tlosing(WindowEvente){System,exit(0);))classchoiceimplementsItemListener{Framef;Choicec;Buttonb;publicvoidbegin(){f=newFrame("Choice");f.setLayout(newGridLayout());f.setSize(300,300);c=newChoice();c.addItem(஻10஻)Wc.addltem(((14(/);c.additem(஻18");f.add(c);bpnewButton("Font");b.setSize(50,50);f.add(b);f.addWindowListener(newWinCloseO);c.addltemListener(this);f.setVisible(true);)publicvoiditemStateChanged(ItemEvente){Stringstr=c.getSelectedltemO;if(str=஻10஻)b.setFont(b.getFont().deriveFont(Float.parseFloat(str)));if(str=஻14஻)

98b.setFont(b.getFont().deriveFont(Float.parseFloat(str)));if(str==஻18஻)b.setFont(b.getFont().deriveFont(Float.parseFloat(str)));)publicclasswork5{publicstaticvoidmain(Stringargs[]){(newchoice()).begin();))7ஹ56ᒹ89:ᑡ⊤?r:᪗t(ᙠv9:᪗tBwxᑡ⊤Byz{Ḅ⌱⚗Ḅᑁ}(ᙠvp:᪗tBwxᑡ⊤By⌱BḄᡠᨵ⌱⚗Ḅᑁ}஺importjava.awt.*;importjava.awt.event.classWinCloseextendsWindowAdapter{publicvoidwindo^tlosing(WindowEvente){System,exit(0);))classlistimplementsItemListener,ActionListener{Framef;Labellabl,lab2;Listli;publicvoidbegin(){f=newFrame("List");f.setLayout(newGridLayout());f.setSize(400,400);f.addWindowListener(newWinClose());labl=newLabel();lab2=newLabel();labl.setSize(100,100);

99Iab2.setSize(100,100);f.add(labl);f.add(lab2);li=newList(10,true);for(inti=0;i<10;i++)li.add(String.valueOf(i));li.addActionListener(this);li.addltemListener(this);f.add(li);f.setVisible(true);)publicvoiditemStateChanged(11emEvente){Stringstrp஻”Wfor(introw=0;row<10;row++){if(li.isIndexSelected(row))str=str+li.getItem(row);elsecontinue;)lab2.setText(str);)publicvoidactionPerformed(ActionEvente){labl.setText(e.getActionCommand());))publicclasswork6{publicstaticvoidmain(Stringargs[]){(newlistO).begin();)8ஹ56᪗Ḅᙶ᪗஺importjava.awt.*;importjava.awt.event.*;classWinCloseextendsWindowAdapter{publicvoidwindowClosing(WindowEvente){System.exit(0);))classmouseimplementsMouseListener

100{Framef;TextFieldt;publicvoidbegin(){fpnewFrame("Mouse");f.setSize(200,200);f.setLayout(newGridLayout());f.addWindowListener(newWinCloseO);t=newTextField();f.add(t);f.setVisible(true);t.addMouseListener(this);)publicvoidmousedicked(MouseEvente){t.setText(String.valueOf(e.getX())+஻,“+String.valueOf(e.getY()));)publicvoidmouseEntered(MouseEvente){}publicvoidmouseExited(MouseEvente){}publicvoidmousePressed(MouseEvente){}publicvoidmouseReleased(MouseEvente){})publicclasswork7{publicstaticvoidmain(Stringargs[]){(newmouse()).begin();))9ஹ569:Frame,Ḅᘤ஺importjava.awt.importjava.awt.event.*;classframeimplementsWindowListener{Framef;Labellab;publicvoidbegin(){f=newFrame("Frame");labpnewLabel();f.setLayout(newGridLayout());f.setSize(100,100);f.addWindowListener(this);

101f.add(lab);f.setVisible(true);)publicvoidwindowActivated(WindowEvente){lab.setText("'Windowactivated!”);)publicvoidwindowClosing(WindowEvente){System,exit(0);)publicvoidwindowOpened(WindowEvente){}publicvoidwindowDeactivated(WindowEvente){lab.setText("Windowdeactivated!;}publicvoidwindowClosed(WindowEvente){}publicvoidwindowlconified(WindowEvente){}publicvoidwindowDeiconified(WindowEvente){})publicclasswork8{publicstaticvoidmain(Stringargs[]){(newframe()).begin();))10ஹᵨ(ᑴ9ᐗp6᪷Ḅ¢£஺⌕¥(1)9ᐗp6g:¢ᦪa,b,c§ᐭ©☢(2)wx«¬b*b4*a*cḄ®(3)wx¯Ḅ᪷°¥packageequation;importjava.awt.importjava.awt.event.importjava,applet.*Wimportjavax.swing.*;importcom.borland.jbcl.layout.*;publicclassFangchengextendsApplet{privatebooleanisStandalone=false;JLabeljLabe11=newJLabel();JTextFieldjTextFieldl=newJTextFieldO;

102JLabeljLabe13=newJLabel();JLabelJLabel2=newJLabel();JLabelJLabel4=newJLabel();JLabelJLabel5=newJLabel();JLabelJLabel6=newJLabel();JTextFieldjTextField2=newJTextFieldO;JTextFieldjTextField3=newJTextFieldOWJButtonjButtonl=newJButton();JTextAreajTextAreal=newJTextAreaO;floatxl,x2,x3,x4;floata,b,c;floatcheck;//GetaparametervaluepublicStringgetParameter(Stringkey,Stringdef){returnisStandalone?System.getProperty(key,def):(getParameter(key)!=null?getParameter(key):def);)//ConstructtheappletpublicFangcheng(){)//Initializetheappletpublicvoidinit(){try{jblnitO;)catch(Exceptione){e.printStackTrace();))//Componentinitializationprivatevoidjblnit()throwsException{jLabel1.setFont(newjava.awt.Font("Dialog”,1,19));jLabell.setForeground(Color,red);jLabel1.setText("µ᧕9ᐗp°¢£஻);jLabell.setBounds(newRectangle(100,8,200,27));this.setLayout(null);jLabel3.setText(“°·¸¥”);

103jLabel3.setBounds(newRectangle(230,45,80,20));jLabel2.setText("6¹ᦪ¥஻);jLabel2.setBounds(newRectangle(60,45,80,20));jLabel4.setText("a:');jLabel4.setBounds(newRectangle(38,80,27,16));jLabel5.setText(஻b:஻)WjLabel5.setBounds(newRectangle(38,130,26,20));jLabel6.setText(஻c:஻)WjLabel6.setBounds(newRectangle(38,180,28,20));JButtonl.setBackground(SystemColor.desktop);jButtonl.setBounds(newRectangle(128,245,116,27));jButtonl.setText("°")WjButtonl.addActionListener(newFangcheng_jButtonl_actionAdapter(this));this.setBackground(UIManager.getColor("Button,focus"));jTextAreal.setBackground(SystemColor.desktop);jTextAreal.setForeground(Color,yellow);jTextAreal.setBounds(newRectangle(185,90,175,100));jTextFieldl.setBackground(SystemColor.desktop);jTextFieldl.setForeground(Color,yellow);jTextFieldl.setCaretColor(Color,black);jTextFieldl.setBounds(newRectangle(70,75,60,30));jTextField2.setBackground(SystemColor.desktop);jTextField2.setForeground(Color,yellow);jTextField2.setCaretColor(Color,black);jTextField2.setBounds(newRectangle(70,125,60,30));jTextField3.setBackground(SystemColor.desktop);jTextField3.setForeground(Color,yellow);jTextField3.setCaretColor(Color,black);jTextField3.setBounds(newRectangle(70,175,60,30));this.add(jLabell,null);this,add(jTextFieldl,null);this.add(jLabel3,null);this.add(jLabel2,null);this.add(jLabel4,null);this.add(jLabel5,null);this.add(jLabel6,null);this.add(jTextField2,null);this.add(jTextField3,null);this,add(jButtonl,null);

104this.add(jTextAreal,null);)//GetAppletinformationpublicStringgetAppletlnfo(){return"AppletInformation”;)//GetparameterinfopublicStringgetParameterlnfo(){returnnull;)booleanAbandon(){intvaluepJOptionPane.showConfirmDialog(this,஻»§ᐭḄ¹ᦪa=0,¼᪵6¾¿À9ᐗp6!ÁÂçᐭÄḄ¹ᦪ!஻(஻஻(JOptionPane.YES_OPTION);switch(value){caseJOptionPane.YESOPTION:jTextFieldl.setText((/(z);JTextField2.setTextC);jTextField3.setText(஻஻)WjTextAreal.setTextC^);break;returntrue;)publicvoidresult()(a=Integer,parselnt(jTextFieldl.getText());b=Integer,parselnt(jTextField2.getText());c=Integer,parselnt(jTextField3.getText());check=b*b4*a*c;if(check>=0)(floatd;d=(float)(Math.sqrt(check));xl=(9b+d)/(2*a);

105x2=(bd)/(2*a);if(check==O)(JTextAreal.setText((zb*b4*a*c=0

106

107"+"xl="+xl+"

108"+஻x2="+x2);)else(jTextAreal.setText("b*b4*a*c>0

109

110஻+஻xl="+xl+"

111"+"x2="+x2);))else{஻ÈÉ;᪷floatd;d=(float)(Math,sqrt(check));x3=b/(2*a);x4=d/(2*a);jTextAreal.setText(,zb*b4*a*c<0

112

113஻+஻xl=஻+x3+"+”+x4++஻x2=஻+x3+஻஻+x4+஻/);))voidjButtonlactionPerformed(ActionEvente){if(Integer,parselnt(jTextFieldl.getText())=0)(Abandon();return;)result();))classFangcheng_JButtonl_actionAdapterimplementsjava.awt.event.ActionListener(Fangchengadaptee;Fangcheng_jButtonl_actionAdapter(Fangchengadaptee){this,adaptee=adaptee;)publicvoidactionPerformed(ActionEvente)(adaptee.jButtonlactionPerformed(e);))

114vᓝpËÌ⚪ÎÏὃ⚪1.ÑᙠÒÓÔwx“ÕÖ×”HØ(µÙJavaÚÛᵨ6ÜAppletḄÝÞḄßà஺á6Ü¥importjava.awt.importjava.awt.event.importjava,applet.publicclasshelloextendsApplet//âãAppeletä,¼ÀApplet6ÜḄᱯæ஺(publicvoidpaint(Graphicsg)(g.drawString("»Ö×”(60,60);஻wx)}çè·¸¥
ᘤ-_l.hello.dassApplet஺JavaÚÛᵨ6ÜApplet6ÜÝÞé⌕ßà᝞`¥(1)ᑭᵨEDITᡈWindowsNotepadH5íᘤîJavaAppletá6Ü஺Javaá6ÜᦻḄ᡽ðñHjava,Ø᝞JavaWorld.java஺(2)òAppletḄá6ÜóᣚHk⁚ṹᦻ஺(3)5ᑴᵨJavaWorld.classḄHTMLᦻ஺ᙠHTMLᦻᑁ÷ᐭø⌕ḄீAPPLETúûü஺ᑭᵨJbuildÝÞAppletÀýþÿḄ
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'(Applet)ᐰ+,஺-./0Applet,23ᘤ45)6789Web23ᘤ(windows98EPWS,widowsNTEHS)஺ᵫLAppletM/023ᘤNOᦟQᙠSᙢUN+,ḄᱯWឋ
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ESunᨵEJavaḄ¡ᑖ஺){4)Appletl&£\◀7SᙢU¤ᵨḄJava᱐S§ஹs~¨©ª᱐S§ஹᦻ¨ᑖ◞¬('/'ᡈ)°±²᜜ᨵᐵSᙢUḄᐸz´µ஺Appletl&£\¤ᵨὅḄ¨·°E-mailᙢᙬ¼஺3ஹ½¾8Applet,¤ᐸᵨᵨ¿8ᢥÁÂᑴ.(1)M23ᘤOÃÄÅÆÇ(2)ÈÉᙢ+,8Ê{¤NËÊ°ÄÅÌÍÆÇ஺packagesound;importjava.awt.*{importjava.awt.event.importjava.applet.importjava.net.*;importjava.util.*{importjava.io.*;publicclassSoundimageextendsAppletimplementsRunnable(Buttonbuttonl=newButton஺{஻ÚÛᓄ38ᢥÁButtonbutton2=newButton();Buttonbutton3=newButton();RandomRandomNumber=newRandom();஻ÚÛᓄÝUᦪRandomNumberThreadShapeThread=nu11;ColorImageColor;஻ÚÛᓄâ⁐}äAudioClipaudioclipl;஻ÚÛᓄåÄ}äpublicvoidstart()(if(ShapeThread==nu11)(ShapeThread=newThread(this);ShapeThread.start();))publicvoidrun()

116while(true)(switch(RandomNumber.nextlnt(6)){//ÝUᦪéᣚE0~4íîḄïcase0:ImageColor=Color,black;break;case1:ImageColor=Color,blue;break;case2:ImageColor=Color,cyan;break;case3:ImageColor=Color,magenta;break;case4:ImageColor=Color,orange;break;case5:ImageColor=Color,white;break;case6:ImageColor=Color.green;break;default:ImageColor=Color,red;)try(ShapeThread.sleep(100);஻ó0ṑḨrepaint();}catch(InterruptedExceptione){஻÷ᶍùúrepaint();)})publicvoidinit()(this.setSize(newDimension(400,300));஻ýþᜧthis.setBackground(Color,yellow);஻⁐

117buttonl.setLabel("ᡭ%&'஻)"/)ᢥ+Ḅ-.button2.setLabel(஻01&'஻)2஻)ᢥ+Ḅ-.buttons.setLabel(஻3401஻)2஻)ᢥ+Ḅ-.this.add(buttonl);஻5ᢥ+buttonl6ᑮApplet:this.add(button2);//5ᢥ+button2;<=Appelt:this,add(button3);//5ᢥ+button36ᑮAppelt:buttonl.addActionListener(newjava.awt.event.ActionListener(){publicvoidactionPerformed(ActionEvente){audioclipl=getAudioClip(getCodeBase(),஻music2.au஻)2஻Gᢥ+buttonlHIJ6K&'ᦻMshowStatus(஻&'ᦻMOPKQRᢥ“01&'”ᢥ+!஻)2஻VW)})2button2.addActionListener(newjava.awt.event.ActionListener(){publicvoidactionPerformed(ActionEvente){audioclipl.loop();஻YZ01&'showStatus(஻[&01:஻)2஻VW})2button3.addActionListener(newjava.awt.event.ActionListener(){publicvoidactionPerformed(ActionEvente){audioclipl.stop();஻3401&'showStatus(஻3401஻)2஻VW)})2)publicvoidpaint(Graphicsg){g.setColor(ImageColor);switch(RandomNumber.nextlnt(3)){஻abcdᦪf2᦮◀Ḅiᦪcase0:g.fillRect(120,60,150,200);//oᐙqrstbreak;casel:g.fill0val(140,80,100,100);//oᐙqrstbreak;case2:g.fillRect(120,60,150,180);஻oᐙqrstbreak;defaults.fill0val(120,60,160,200);஻oᐙqrwᙊbreak;}

118))yᓝ{|}⚪ὃ⚪1.᝞ᦪḄ:JDBCᦪQ✌ᐜfᦪ,ᵨᡝᑮqrjava.sql.ConnectionḄ஺rᦪḄᡠᨵ¡¢£¤r஺¥¦fᦪQJDBC§¨6K©ª«¬஺©ª«¬®JDBC-ODBC᫑©ª«¬QᡈᵫᦪᔆᖪV¶Ḅ©ª«¬Qᡈ)Java·ឋ:Ḅsql.driverᩭᢣ©ª«¬஺DriverManagerḄgetConnection¼½ᵨ¤f¾rᦪ¿Ḅ஺ÀfᵫURLᢣḄᦪ¿ᡂÃQᑣÅÆqrConnectionḄ஺®Ç¤rᦪ¿Ḅ¡¢£¤r஺getConnection¼½DriverManager:Ḅ☟᝱¼½஺ᡠ®ÊᵨJË᪀⌼DriverManagerḄQÎÊᵨ-DriverManagerÏᵨЮ¦஺2ஹᨵÒᑏ¼½®I〈ஹ¡ᦪḄSQLÖ×ØJDBC:ÙÚÖ×᡻ܼ½ᑖ¥{ØStatement,PreparedStatementÞCallableStatement஺ᙠStatementàQ®ÊᵨexecQuery¼½ᩭ᡻ÜqÙÚÖ×஺execQueryḄáᦪqrStringQᓽqrSELECTÖ×஺äḄÅÆåqrResultSetḄ஺PreparedStatementæÊᵨexecQuery¼½ᩭ᡻ÜÖ×஺CallableStatementÊᵨ᱄PreparedStatementḄexecQuery¼½ᡈexecute¼½ᩭ᡻Üèé«Ḅ஺3.᝞ᜐᳮᦪ¡ḄìíØResultSetᒹïqrᵫÙÚÖ×ÅÆḄqr⊤Qr⊤:ᒹñᡠᨵḄÙÚìí஺ResultSetḄᜐᳮ§¨⌲ÜóÜQôõqÜ:ḄᔜrᑡQ®ᢥøù¬ᜐᳮ஺ResultSetúᢝqrᢣᔣGýþÿḄᢣ┐஺ᵨnextᢣ┐ᢣᔣḄᦪ⚗!ᜐᳮ஺ᜐᳮ$%&ᵨnextᢣ┐ᢣᔣ'()ᜐᳮ*Ḅᦪ஺next+,Ḅ-boolean234true,ᑣ9:ᢣ┐ᡂ<ᙢ>ᔣ'*Ḅᦪ!ᜐᳮ?@34false,ᑣ9:Cᨵ'ᓽᜐᳮ$%஺4ஹ᝞IJKᐵMᦪNḄOPQRSᙠᦪN!UV&KᑮConnection[Ḅ\]\JKᨵᐵᦪ^Ḅᔜ`OPᒹbᐵMᦪNcḄᔜ`⊤⊤cḄᔜᑡᦪ[fghijklᔜ☢ḄOP.᪷pOPJDBCktuvwᐜyz{|ḄᦪN஺J}pOPḄ~-ᙠDatabaseMetaData[Ḅ\Ḅ஺'☢ḄᙠὶVḄẠ\SDatabaseMetaDatadbma=con.getMetaData();DatabaseMetaData[c{ᵨMJKᦪ^Ḅᔜ☢ḄUjpᙢ{|ᦪN᪀஺

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122UDP@A#$Ḅ@AὅஹGᡝ,V,UDP⌕f〈ḄᦪmḄIPᙢᙬஹmR=S᪀ᡂᦻ'Umyᦻ!**£9ᙢᙢf〈¤஺UDP¥¦§¨©ᦪ!Mᑮª«Ḅᙢ'§¨©ᦪᑮª«Ḅᙢ¬V஺'b"@AḄ☠ឋ¯ᨵᵨ°ᩭ±²஺@AᘤᑭᵨUDP±²GᡝQ@Aᘤ´µ01'✌ᐜ89ᦪᝅ=}';¶ᢣM!*R=S'¯ᵫ¸¹;_wMR=S஺ᑭᵨºḄ᪀⌼mnDatagramSocket()¸¹;_wMR=S'b245ᑭᵨgetLocalPortO)mn¾¿tᦪR=S஺b*R=S@AᘤḄ1PᙢᙬGᡝmf〈ᦻᩭÁ45Â⍝Ḅ஺ᔲᑣ'Gᡝmnf〈ᦻ஺GᡝmᑭᵨUDP±²GᡝQ@Aᘤ´µ01'✌ᐜ⌕89ᦪᝅ=}'!ÆoᵨºḄ᪀⌼mnDatagramSocket()'b2'¸¹;_wM!*R=S'ᯠCᑭᵨf〈ᦻÈÉÊஹ@AᘤḄIPᙢᙬ@AᘤḄR=S89f〈ᦪᒹDatagramPacket}஺ᑭᵨ89Ḅᦪᝅ=f〈tDatagramPacket}஺5ஹᑭᵨJava%&ᒹjava,io?ᝅ=hSocketQ@Aὅᝅ=h(ServerSocket)ᑖѱ²ᨵQḄ0Ò஺ÓTCP±²ᨵḄ0Ò@AᘤR,Vimportjava.io.*;importjava.net.*;publicclassTcpserver

123staticpublicvoidmain(Stringargs[])throwslOException(ServerSocketsvrsoc=null;Socketsoc=null;DatalnputStreamin=null;PrintStreamout=null;InetAddressclientIP=null;Stringstr=null;try(svrsoc=newServerSocket(8000);//᪀⌼rverSockets}'R=8000soc=svrsoc.accept();஻@Aὅde!*'z{|ᝅ=socin=newDatalnputStream(soc.getInputStreamO);஻ᙠ|ᝅ=soc\᪀⌼//DatalnputStream}inout=newPrintStream(soc.getOutputStreamO);஻ᙠ|ᝅ=soc\᪀⌼////PrintStream}outclientIP=soc.getinetAddress0;஻çᑮèGmIPᙢᙬSystem.out.printIn(஻GᡝRḄIPᙢᙬ"+clientIP);out.printin(஻ëìíîï@Aᘤð஻)ñstr=in.readLineO;஻ᙠin\ò!/while(!str.equals(''quit'/))஻᝞òḄ“quit”'øùò(System,out.printin(஻GᡝR஻+str);str=in.readLineO;}System.out.printin(஻GᡝRû⌕üý.“);)catch(Exceptione)(System,out.printIn(zzError:z+e);)))ᡝimportjava.net.importjava.io.*;publicclasstcpclient

124staticpublicvoidmain(Stringargs[])throwslOExceptionSocketsoc=null;BufferedReaderin=null;PrintWriterout=null;Stringstrin=null;Stringstrout=null;try(soc=newSocket("localhost”,8000);System.out.printIn(஻8ᡂ:;<ᑮ>?ᘤ஻)Ain=newBufferedReader(newInputStreamReader(soc.getInputStream()));out=newPrintWriter(newBufferedWriter(newOutputStreamWriter(soc.getOutputStream())),true);strin=in.readLineO;System.out.printin(஻>?ᘤ"+strin);bytebmsg[]=newbyte[100];System,in.read(bmsg);Stringmsg=newString(bmsg,0);msg=msg.trim();while(!msg.equals(஻quit஻))(out.printin(msg);System,in.read(bmsg);msg=newString(bmsg,0);msg=msg.trim();out.printin(msg);)out.printin(strout);}catch(Exceptione){System.out.printin("Error:஻+e);}finally

125in.close();out.closeO;soc.closeO;System,exit(0);)IJKL>?ᘤMNOPQRᡝḄIPᙢᙬV:/127.0.0.1ᡝ:Hello!WeloveJava!ᡝ\⌕^_.ᡝMNOP8ᡂ:;<ᑮ>?ᘤ>?ᘤ:`abcd>?ᘤeHello!WeloveJava!QuitUDPijklm;?ᘤimportjava.net.importjava.io.*;publicclassUDPServer{publicstaticvoidmain(String[]args){byte[]buf=newbyte[1024];//qᦻstutry{஻᪀⌼DatagramSocketxyzO{6789DatagramSocketserversocket=newDatagramSocket(6789);஻~ᦪqᝅ?ᘤᙠP.....");while(true){஻᪀⌼DatagramPacketxyzᵨᩭᦪqᝅ<<ᦈᦪqDatagramPacketserverpacket=newDatagramPacket(buf,1024);஻<ᦈᦪqserversocket,receive(serverpacket);஻⁚ᦪᣚᡂStringdata=newString(buf,0,serverpacket.getLengthO);if(data,equals'"))

126continue;if(data,equals("quit"))break;System,out.printingᡝ஻+data);஻<ᦈḄᣚᡂᜧᑏStringstrToSend=data.toUpperCase();InetAddressclientIP=serverpacket.getAddressO;஻ᡝᙢᙬintclientPort=serverpacket.getPort();஻ᡝObyte[]msg=strToSend.getBytesO;//DatagramPacketclientpacket=newDatagramPacket(msg,strToSend.length(),clientIP,clientPort);஻ᦪᡭᒹ〈ᡝserversocket,send(clientpacket);)serversocket,close();System.out.printin(஻>?ᘤ8ᐵe஻);}catch(Exceptione)(e.printStackTrace();)))ᡝimportjava.net.importjava.io.*;publicclassUDPClient(publicstaticvoidmain(String[]args){try(StringstrToSend;byte[]bufsend;஻〈qᦻstubyte[]bufrec;஻<ᦈqᦻstuDatagramPacketclientPacket;஻᪀⌼DatagramSocketxyzclientSocketDatagramSocketclientSocket=newDatagramSocket();//᪀⌼DatalnputStreamxyz஻sysin,¡System,in¢£DatalnputStreamsysin=newDatalnputStream(System,in);while(true)(System,out.print(஻¤ᐭ஻);஻sysin¤ᐭ¦JstrToSend=sysin.readLine();஻§ᣚV⁚ᦪ

127bufsend=strToSend.getBytesO;//᪀⌼DatagramPacketxyzclientpacket,>?ᘤO{¨£V6789DatagramPacketclientpacket=newDatagramPacket(bufsend,strToSend.length(),InetAddress.getLocalHost(),6789);஻¤ᐭ¦J©ᡭᒹ〈>?ᘤclientSocket.send(clientpacket);஻᝞¤ᐭ«quit,¬〈if(strToSend.equals("quit"))break;bufrec=newbyte[1024];DatagramPacketreceivePacket=newDatagramPacket(bufrec,1024);஻<ᦈᦪqclientSocket.receive(receivePacket);Stringreceived=newString(receivePacket.getDataO,0);System.out.printin(">?ᘤ"+received);஻®¯᪀⌼ᦪq<ᦈ>?ᘤᩭḄᦪ}clientSocket.close();}catch(Exceptione)//°±ᜐ(e.printStackTrace();)})IJKL>?ᘤMNOPQR>?ᘤᙠP.....ᡝ:hello!Imissyou!>?ᘤ8ᐵeᡝMNOPQR¤ᐭ:hello!Imissyou!>?ᘤ:HELLO!IMISSYOU!¤ᐭquitµᓝ·¸¹⚪»¼ὃ⚪1)(¾¿⚪)¾ᓫÁ¿yÂÃÄÅÆḄÇÈÉÊË2)ÌÍ«yÎÏṹᢈÒÓÔyÎÏṹᢈÒË

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