《java语言程序设计课件资料》《java语言程序设计》期末考试试题及答案1-7

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5this.name=name×this.age=age×)publicstaticvoidmain(String[]args){Personc=newPerson('*Peter",17)×System,out.printin(c.name+'*is"+c.age+nyearsold!))2ஹ;uḄ©¥ôÌ+—ûi:101û$:ASPüᑖ:3—஺publicclassCourse{privateStringeNumber×privateStringcName;privateintcUnit;publicCourse(Stringnumber,Stringnameintunit){z

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10super(name,age))voidout(){super.out();super.outOther()System,out.printIn(")᪥:"+school))publicstaticvoidmain(Stringargs[]){Sonson=newSon("Tom”,15);son.address="$%&”son.school="+,”son.tel="66123456”son.out())

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13᝞ᙠ-E¹,¼½RÎEÔḄNÝÚᡈᨵÔḄ§ᦪEᦪᡈᨵÔḄ§ᦪ¹àNᑣÇÈḄÐ(Overloading)஺OverloadedḄ2pᦋãäåæḄ¹à஺çஹèé⚪1ஹᢥ⌕ëìᑏ(1)®¯-ERectangle,íîwidthbheightïEᡂᕒãð(2)ᙠRectangle,íîïÅᑖÒéòóôḄᕜöb☢÷(3)ìᑭᵨRectangle-EóôḄᕜöb☢÷ù5publicclassRectangle{floatwidth,heightpublicRectangle(floatwidth,floatheight){this.width=widththis.height=heightpublicfloatgetLength(){

14return(this.width+this.height)*2publicfloatgetArea(){returnthis.width*this.height;publicstaticvoidmain(String[]args){Rectanglerect=newRectangle(10,20)System.out.printIn("+rect.getLength());System,out.printIn("+rect.getArea());2ஹᢥ⌕ëìᑏ(1)ìᑏAnimalúNú,ûrun()(2)¼½Bird¹bFish¹aLAnimalú

15(3)ìᑏBird¹bFish¹Ḅüý,Sᵨᐸ,Ḅrun()ù5publicinterfaceAnimal{voidrun())classBirdimplementsAnimal{publicvoidrun(){System.out.printin("þJLᙠÿ))classFishimplementsAnimal(publicvoidrun(){System.out.printin("ᙠ)

16publicclassTestAnimal(publicstaticvoidmain(String[]args){Birdbird=newBird()bird.run()Fishfish=newFish()fish.run()))3ஹᑏFrame᪾ᵨ⌕᝞পᙠᓫ"ᦻ!"ஹ"""ফᙠ"ᦻ!"ᓫ$%&'ᓫ⚗"ᡭ*"ஹ"+,"ஹ"ᐵ."(3)ᙠ"""ᓫ$%&ᓫ⚗"/ᑴ"ஹ"12"ভ45ᐵ.ᓫ⚗67ᐵ.஺9:importjava.awt.Color

17importjava.awt.Frameimportjava.awt.Menuimportjava.awt.MenuBarimportjava.awt.Menuitemimportjava.awt.event.ActionEventimportjava.awt.event.ActionListenerimportjava.awt.event.WindowAdapterimportjava.awt.event.WindowEvent**=>*publicclassMyFrameextendsFrame(privatestaticfinallongserialVersionUID=6895463895656626294LprivateFramefrmMain//>MenuBarmb//ᓫ@

18MenumnuFile//"ᦻ!"ᓫMenumnuEdit//“"”ᓫMenuitemmiOpen//"ᡭ*"ᓫ⚗MenuItemmiSave//"+,"ᓫ⚗MenuitemmiClose//"ᐵ.ᓫ⚗MenuItemmiCopy//"/ᑴ"ᓫ⚗MenuitemmiPaste//"12"ᓫ⚗publicMyFrame(){frmMain=newFrame("=>”)//DEᓫ@mb=newMenuBar()//DEᓫmnuFile=newMenu(";

19mnuEdit=newMenu(“"”)//DEᓫ⚗miOpen=newMenuitem('*JTFFn);miSave=newMenuFtem(“+,”)miClose=newMenuFtem(“ᐵ.”)miCopy=newMenuFtem(“/ᑴ”)miPaste=newMenuFtem(“12”))publicvoidshowFrame(){frmMain.setsize(800,600)frmMain.setLocation(100,100)frmMain.setBackground(Color.white)frmMain.setVisible(true)frmMain.setLayout(null)

20frmMain.addWindowListener(newWindowHandler());//GHIJᘤ//Lᓫ@Mᐭ>OfrmMain.setMenuBar(mb)//LᓫMᐭᓫ@Omb.add(mnuFile)mb.add(mnuEdit)//Lᓫ⚗MᐭᓫOmnuFile.add(miOpen)mnuFile.add(miSave)mnuFile.add(miClose)mnuEdit.add(miCopy)mnuEdit.add(miPaste)//GHPQR!IJᘤmiClose.setActionCommand("miClose_Clicked")miClose.addActionListener(newMenuHandler())

21)//ST•ᑁWXᙠYXOᑏᐵ.R!ᜐᳮ஺privateclassWindowHandlerextendsWindowAdapter(publicvoidwindowclosing(WindowEvente){System.exit(0)//⌨]ᵨ^᝱ṹ0⊤bcdefg0⊤bhdef஺))//STᑁWXᙠYXOᑏPQR!ᜐᳮ஺privateclassMenuHandlerimplementsActionListener(publicvoidactionPerformed(ActionEvente)

22if(e.getActionCommand()"miCloseClicked")System.exit(0)//⌨]ᵨ))publicclassTestMyFrame{publicstaticvoidmain(String[]args){//iP=>MyFrameguiWindow=newMyFrame()guiWindow.showFrame()jJAVAklmnopὃrr⚪t:ᫀ4vὃwᜓ⚪yz

23ஹᓫ⌱⚪1ஹᑡ|᡻~Ḅ()oStrings=newString(Habcdefg");for(inti=0;i

24System.out.print(bl+""+b2);AJtruefalseB)falsetrueC)truetrueD)falsefalse5ஹᵨḄmainOᨵk²ᑣ³]Ḅ()஺Hashtablehashtable=newHashtable();hashtable.put("x",12345");hashtable.put("y","67890n);hashtable.putC'a'V'abcde");System.out.println(hashtable.get("a"));A)aB)abcdeC)12345D)678906ஹ☢k²Ḅ´µ()oRandomAccessFileraf2=newRandomAccessFileCl.txt","rw");A)ᡭ*¶·¸¹Ḅᦻ!l.txt,º»ᔣᦻ!ᑏᦪ½¾»¿ᦻ!¡ᦪ½஺B)ᡭ*¶·¸¹Ḅᦻ!l.txt,ÀÁµᔣᦻ!ᑏᐭᦪ½µ¿ᦻ!¡¢ᦪ½஺C)ᡭ*¶·¸¹Ḅᦻ!l.txt,Àµᔣᦻ!ᑏᐭᦪ½Áµ¿ᦻ!¡¢ᦪ½஺D)ÃÄÅÂ஺7ஹᵨḄmainOᨵk²ᑣ³]Ḅ()஺Strings="12345#aaa#bbb#67890”;intn=s.indexOf("#")intk=s.indexOf("#",n+l);intm=s.indexOf("#",k+l);Strings2=s.substring(m+l);System.out.println(s2);

25A)123456B)67890C)aaaD)bbb8ஹ☢|᡻~bḄ()oIntegerinteg=newlnteger(9)booleanb=integinstanceofObject;A)9B)trueC)1D)false9ஹᵨTestjavaḄÆ᝞ᙠÇÈ~ÉᐭjavaTestaaabbcÊ˳]Ḅ()opublicclassTest{publicstaticvoidmain(Stringargs[]){intkl=args.length;intk2=args[l].length();System.out.print(kl+""+k2);))A)32B)12C)13D)3310ஹᵨḄmainOᨵk²ᑣ³]Ḅ()஺intb[][]={{l},{22}{2,2,2});ffintsum=0;for(inti=O;i

26)System.out.println("sum="+sum);A)32B)llC)2D)311ஹᵨḄmainOᨵk²ᑣ᡻~³]Ḅ()஺int[]x={125,21,5,168,98);intmax=x[O];for(inti=l;imax)max=x[i];)System.out.println(max);A)125B)5C)98D)16812ஹTest.javaÌÍ~³]Ḅ()஺publicclassTest{Stringsl="java";publicstaticvoidmain(Stringargs[]){intz=2;Testt=newTest();System.out.println(t.sl+z);)}

27A)java2B)2C)Îᨵ³]D)java13ஹᵨḄmainOᨵk²ᑣ³]Ḅ()஺Stringsi=”0.5”,s2=,,12";doublex=Double.parseDouble(sl);inty=lnteger.parselnt(s2);System.out.println(x+y);A)12.5B)120.5C)12D)“12.5஻14ஹ☢ḄDEᦻ!³]Ðᵨᩭᔣᦻ!test.txtO³]ᦪ½Ꮇ¶·¸¹Â,ᙠᦻ!test.txt,Ì☢ḄTest.javaLÓÍ~3ᑣᦻ!test.txtḄᑁÔ(),.importjava.io.*;publicclassTest{publicstaticvoidmain(Stringargs[]){try(Strings="ABCDE";byteb[]=s.getBytes();FileOutputStreamfile=newFileOutputStream("test.txt",true);file.write(b);file.close();)catch(IOExceptione){System.out.println(e.toString());

28)))A)ABCABCB)ABCDEC)TestD)ABCDEABCDEABCDE
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30ஹ▅⚪1ஹ▅/☢ḄHK⚪(૘3ᑖ૙3ᑖᐳ6ᑖ)஺importjava.awt.*;importjavax.swing.*;publicclassTextendsJFrame{publicT(){super("GridLayoutn);Containercon=this.getContentPane();con.setLayout(newGridLayout(2,3))con.add(newJButton("a"));con.add(newJButton("b"));con.add(newJButton("c"));con.add(newJButton("d"));con.add(newJButton("e"));con.add(newJButton("f"));setSize(200,80);setVisible(true);)publicstaticvoidmain(Stringargs[]){newT();)}

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333ஹ=ᵨHKḄmain!ᨵ'/ᑣ¶AḄ:J஺Strings=Hxxxxxxxxxxxxxxx#123#456#zzzzz";intn=s.indexOf("#")intk=s.indexOfC'#",n+1);Strings2=s.substring(n+l,k);System.out.println(s2);A)123456B)123C)xxxxxxxxxxxxxxxD)zzzzz4ஹᐵ1/☢ḄHKTest.java7!89Ḅ()஺publicclassTest{Stringx="l";inty;publicstaticvoidmain(Stringargs[]){intz=2;System.out.println(x+y+z);)}A)3B)102C)12D)HKᨵ²³┯Ö5ஹ=ᵨHKḄmain!ᨵ'/ᑣ¶AḄ()஺intb[][l={{l,1,1},{2,2},{3});intsum=0;for(inti=0;i

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35+hashtable.get("200H).toString()+hashtable.get(H100").toString());A)aaaB)bbbC)cccD)cccbbbaaa8ஹ'/ᐵ1java237!(89Ḅ()஺A)ThrowableJava×ErrorExceptionḄ᱄஺B)Ç23F$Exception(ᡈᐸÓ)Ḅ£ÙvB

36catch(IOExceptione){System.out.println(e.toStringO);))}A)ABCABCB)ABCDEC)TestD)ABCDEABCDEABCDE10ஹ/☢7!(89Ḅ()?A)ᑡ⊤(List)ஹìᔠ(Set)᧜ï(Mapðjava.utilᒹḄ஺B)List&'ᒹñòᐗôḄᨵKìᔠ஺C)Set(ᒹñòᐗôḄìᔠ஺D)MapᏉ᧜ïᑮö+&'ñò%ᏉᨬTÞB᧜ïö஺ÅஹT⌱⚪1ஹ/☢øùᐵ+,Bᵨᩭ`ᑴFᡂᕒḄû()?A)publicB)protectedC)privateD)default2ஹ/☢ᐵ1Java23ᜐᳮtryᙽḄ7!89Ḅ()?A)tryᙽ;<3=ᨵcatchᙽᵨᩭᜐᳮtryᙽ@AḄ23஺B)catchᙽ;ᨵfinallyᙽ஺C)&B@A23Ḅ!Cᵨ=Dᙠtryᙽ஺D)F@AḄ23ḄᜐᳮDᙠtryᙽ3ஹIHF$ḄSüᕜÁ<3þᔊ☢᝱()஺A)B)C)D)

374ஹ᝞Ḅᦪb,☢ḄḄ()ointb[]□={{1,2,3},{4,5},{6,7.8}});A)b.lengthḄ:3஺B)b[l].lengthḄ:3஺Ḅ:5஺D)ᦪbḄ=•ᨵ3@ᐗB5ஹCBD@EFCGCCCBḄIEFJCGᑡLMFxlḄOPQḄ()஺A)Bxl=newB();B)Bxl=newC();C)Cxl=newC();D)Cxl=newB();6ஹ☢ᐵSTUஹVUḄḄ()஺A)TUUWḄDXY᝱᡻[U஺D@TUᙠᐸ᡻[UQG^_`ab@VUDDbVUGcᡂbᩩ᡻Vf஺B)VUgTUhiḄ᡻ᓫkGᙠD@TUQlmḄnᑴpGᓽUWᑁsḄtᑴp஺VUuvwxyYG᪠vS{@TU|QGᵫTU~Y᡻஺C)JavabVUḄᐵ஺D)MSᓫᜐᳮᘤGb@VUᑖᱏCPUᡈᐸᩭ஺MSbᜐᳮᘤGVU^_ᑖᑮb@ᜐᳮᘤQGḄ᡻b஺7ஹ☢ᐵS᜜sCᑁsCᡂᕒḄ¡Ḅ¢ᑣQGḄ⌱⚗()oA)ᑁsC^_¦§¡᜜sCḄᡂᕒB)᜜sC^_¦§¡ᑁsCḄᡂᕒC)᜜sCwx¡ᑁsCḄᡂᕒD)᜜sC^¨[LᑁsCḄ©ªᩭ¡ᑁsCḄᡂᕒ«ஹUW▅⚪1ஹ▅☢ḄUW¯ṹG±²¡⚪(૘¡3ᑖG૙¡3ᑖGᐳ6ᑖ)஺

38Stringsi=newString("abcde");Strings2=newString("abcde");booleanbl=sl.equals(s2);booleanb2=sl==s2;System.out.print(bl+H"+b2);૘UW´᡻µGᙠ¶·Ḅ¸¹º»᝞¼½૙¾¿¸¹(1)Ḅº»ḄÀÁ½²ᫀÃ૘truefalse૙equalsÄgÅÆ@ÇÈÉḄᑁÊᔲÌÍÎÈ“”ᑨÒÆ@MFᔲᢣᔣÕ•@ÖᵨGᓽᔲØÕD@MF஺2ஹ▅☢ḄUWG±²¡⚪(૘¡3ᑖG૙¡3ᑖGᐳ6ᑖ)஺importjava.io.*;publicclassTest{publicstaticvoidmain(Stringargs[])throwslOException{BufferedReaderbuf=newBufferedReader(newInputStreamReader(System.in));while(true){Stringstr=buf.readLine();if(str.equals("quit"))break;

39intx=lnteger.parselnt(str);System.out.println(x*x);)))ÙÚÛ☢ḄUWÃOÜݸᐭ10,±ßµ¸¹Ḅº»᝞¼½૙Üݸᐭexit,±ßµUWx᡻ᔩ½Øáâ½²ᫀÃ૘100૙wxÍÁØÄInteger.parselnt(str)wxãÇÈÉ“exit”äᓄØ᦮ᦪGç¹èé஺3ஹᑏ¹☢ḄUWÙÚஹµḄº»(6ᑖ)஺publicclassTest{publicstaticvoidmain(Stringargs[]){newStudent("Tom",'m',90,88);newStudent("Jack",'m',66,89);newStudent-Mary",'f',76,86);System.out.println("name\tsex\tchinese\tenglish");Student.print();))

40classStudent{protectedStringname;protectedcharsex;protectedintChinese;protectedintenglish;protectedStudentnext;staticStudentlist;Student(Stringname,charsex,intChinese,intenglish)this.name=name;this.sex=sex;this.chinese=chinese;this.english=english;this.next=list;list=this;)staticvoidprint(){Studentfriend=list;if(friend==null)System.out.println("Thelistisempty.");else(do{System.out.println(friend.toString());

41friend=friend.next;}while(friend!=null);)publicStringtoString(){returnnewString(name+"\t"+sex+,,\t"+chinese+"\t"+english);)}²ᫀÃnamesexChineseenglishMaryf7686Jackm6689Tomm9088ëJAVAUWìíîïðὃòò⚪óôõDஹö÷⚪1.CḄøᶇÇóclass,§úḄøᶇÇóinterfaceõ஺2.Socket¨éûüØóᝅ§ÇõGᵨSþÿIPᙢᙬ஺3.Ḅᐜᙠ110ᦪᜧញ஺

424.᪀⌼!"ᱯ$Ḅᡂᕒ᪀⌼'()'*+஺5.Java,-.ᐕ0ᓫ23ᢣ56).7ᨵ!6᱄)஺6.Java:;Ḅ᡽='
.java,>?@ABḄ;Ḅ᡽='.class஺7.ᙠ!6C.7ᵫ!6EFḄG:HIJKG:஺EFJKG:ḄLṹJKLṹ஺8.ᙠNOPQN6ᨵ+RSTU"ᐵO஺Wஹ⌱Z⚪1.ᐵ\⌱Z]᪀^ᑡ`6abcdA.if,eelse,efgᡂhijB.if,eklmᨵelse,ehnC.switch]᪀Q56case,eQfgᵨbreak,eD.switch]᪀Qfgᨵdefault,e2.whilepqdo...whilepqḄrstA.mᨵrsuU6]᪀vwx^ᦔz!᪵B.whilepq|do...whilepq᡻~ᦔ᳛C.whilepqᐜpqBᑨᡠlpq᡻~!D.do...whilepqᐜpqBᑨᡠlpq᡻~!3.ᐵ\forpqwhilepqḄa`6bcdA.whilepqᐜᑨB᡻~forpqᐜ᡻~Bᑨ஺B.whilepqᑨᩩ!;]zforpqḄᑨᩩ!;]zC.U"pqvC᎛klᣚ

43D.U"pq]᪀Qfgᨵpqpq7I4.^ᑡ⛲Q(EFᑴᐵḄA.privateB.publicC.protectedD.final5.voidḄtA.mᨵB.IC.mᨵD.Cfgᵨ6.return,etA..7ᦪB.fgᨵC.QklᨵNereturnD.7ᵨᩭh¢7.ᐵ\h¢ᡂᕒᓰᵨᑁ¥Ḅa`6bcdA.+!6)Ḅh¢ᐳᵨ+!§ᑁ¥Bஹ+!6)Ḅh¢ᵨ+Ḅᑁ¥§¨☟᝱ᡂᕒᐳ«*+Ḅᑁ¥C.h¢Ḅᓰᵨᑁ¥D.l¬h8.^ᑡa`6bcdA.◤⌕)¯7°±h¢B.h¢Qfgᨵ²ឋC.²ឋkl´ᓫµ¶·kl!6h¢Dஹ²ឋfg´ᓫµ¶9.^ᑡa`6bcdAஹ!6;klᒹN6:ᦻ

44Bஹ!6:ᦻQ.7ᨵ!6)Cஹ!6:ᦻQklᨵN6ºᐳ)Dஹ!6:ᦻ.7»!6;ᵨ10.ᐵ\main()Ḅa`6bcd()A.main().7¾ᙠºᐳ)QBmain஺Ḅᜮkl᪷ÁwxÂᦋC.!6)Qklmᨵmain()D.ᡠᨵh¢Ḅ°±fg¾ᙠmain()Q11.᪀⌼ÄᦪvCÅᵨd)Aஹ°±h¢CBஹ)CCஹᵨh¢ḄCDஹᵨh¢Ḅ²ឋC12.Æ¢t()AஹklᨵBஹklijᙠÆ¢)QCஹmᨵḄDஹÆ¢)QḄÆ¢13.ᐵ\23ḄabcḄt)AஹÇ)È23᱄)ᡠᨵḄ²ឋ஺BஹÇ)È23᱄)ḄÉᨵ²ឋ஺CஹÇ).23᱄)public²ឋDஹÇ).23᱄)ḄÊ23²ឋ14.ᐵ\᪀⌼ÄᦪḄa`6bcd

45Aஹ!6).7ᨵ!6᪀⌼ÄᦪBஹ!6)klᨵN6+'Ḅ᪀⌼ÄᦪCஹ᪀⌼Äᦪ()+'Dஹ᪀⌼ÄᦪfgËÌ7ᵨ᱄)Ḅ᪀⌼Äᦪ17.⌚Î(ÏÐḄᐵOAஹ⌚Î.ᨵÑÒᙠ᱄)(Ç)ÊÏÐklÑÒᙠ+!6)QB.⌚Îkl+'ÊÏÐfg+'C.final⛲Ḅkl⌚Ψ7ÏÐD.⌚Î(ÏÐ+!Ó18.ᐵ\Ô`6bcdAஹÕj!6ÔfgÕjÔḄᡠᨵB.!6).7Õj6ÔC.Ô7ᨵ23ᐵOD.ÔÆ¢)+!Ó19.Ö×ᒹ^ᑡ`ØᑁÙdA.;᡻~?Q⍗ᑮḄÓᐜmᨵ⚜ᧇᑮḄwxB.;QḄ,┯ßC.;Ḅ@A┯ßD.l¬20.h\à>?k7áiÖ×Ḅ,eᙠ@CtAஹfgᵨtry/catch,eᜐᳮÖ×ᡈᵨthrowsÈᐸái

46B.᝞z;┯ßfgᵨtry/catch,eᜐᳮÖ×C.klçᳮD..7ᵨtry/catch,eᜐᳮ21.èé(è⁚éḄrsᙠ\()A.ëὅíᨵîïBὅmᨵB.ëὅᙽñᑏBὅè⁚ñᑏC.WὅmᨵrsklSᣚᵨD.5ñᑏḄè⁚ᦪ+22.^ᑡéQ`6²\è⁚é()A.FilelnputStreamB.BufferedlnputStreamC.FilterinputstreamD.InputStreamReaderóஹ;ô⚪1.publicclassSum{publicstaticvoidmain(String[]args){intj=10;System.out.println("jis:"+j);calculate(j);System.out.println("Atlast,jis:"+j);)staticvoidcalculate(intj){

47for(inti=0;i<10;i++)j++õSystem.out.println("jincalculate()is:"+j);))öi]zItjist(1)jincalculate()is:(2)Atlastjis:(3)÷ᫀtপ10(2)20(3)10o2.ᢥ⌕ûôabstractclassSuperAbstract{voida(){...}abstractvoidb();abstractintc(inti);)interfaceAsSuper{voidx();abstractclassSubAbstractextendsSuperAbstractimplementsAsSuper

48publicvoidb(){...}abstractStringf();)publicclassInheritAbstractextendsSubAbstract{publicvoidx(){...}publicintc(inti){...}publicStringf(){...}publicstaticvoidmain(Stringargs[]){InheritAbstractinstance=newlnheritAbstract();instance.x();instance.a();instance.b();instance.c(100);System.out.println(instance.f());))ᙠl¬u§;QtÆ¢)ᨵtSuperAbstract(1)(ᑏi)')Æ¢)ᨵt(2)(ᑏi)')Ôᨵt(3)(ᑏiÔ')AsSuperQḄx()(4)ᡠlᙠInheritAbstractQfghüý~(5)÷ᫀ:

49(1)SuperAbstract(2)InheritAbstract(3)AsSuper(4)Æ¢õ(5)⌚ÎÕj஺3.ᢥÿ
ᡂpublicclassLeaf{privateinti=0;஻ឋᵨLeafincrement஺{஻increment஺LeafḄi++;return(1);஻Ḅᙢᙬ!")voidprint(){System.out.println("i="+i);)publicstaticvoidmain(Stringargs[]){Leafx=(2);஻#$LeafḄxx.increment().increment().increment().print();}஻&'(ᵨincrement஺Ḅ)xḄᙢᙬi⊤+(ᵨ'ᦪ)-./0"i=(3)1ᫀ3(1)this(2)newLeaf()(3)34.ᢥ56+
ᡂᦻ89ᑴḄ//FileStream;<ṹ᝞?:importjava.io.*;

50classFileStream{publicstaticvoidmain(Stringargs[]){try(FileinFile=newFile(”filel.txt");஻ᢣ;ᦻ8FileoutFile=newFile("file2.txt");஻ᢣC᪗ᦻ8Fileinputstreamfis=(1);FileOutputStreamfos=newFileOutputStream(outFile);intc;஻⌲F⁚H;ᦻ8I-ᐭK-.ᑮfosMwhile((c=fis.read())!=-1)(2)fis.close();fos.close();}catch(Exceptione){System.out.println(nFileStreamsTest:"+e);}))1ᫀ3(1)newFilelnputStream(inFile);(2)fos.write(c);

515.▅OP./03//AbstractClassDemo.java;<ṹ᝞?3abstractclassShape{஻QShapeRQdisplayabstractvoiddisplay();}classCircleextendsShape{voiddisplay(){஻STQḄSystem.out.println("Circle");))classRectangleextendsShape{voiddisplay(){஻STQḄSystem.out.println("Rectangle");))classTriangleextendsShape{voiddisplay(){஻STQḄSystem.out.printlnCTriangle'*);})publicclassAbstractClassDemo{publicstaticvoidmain(Stringargs[]){

52(newCircle()).display();஻UVᩭ(ᵨXḄdisplay(newRectangle()).display();(newTriangle()),display();))-./0Y1ᫀ3(1)Circle(2)Rectangle(3)Triangle஺ZJAVA[\]^_ὃaa⚪(d)fஹ⌱i⚪1.jk.?ᑡ<ṹḄ᡻n/03Strings="abed";Stringsi=newString(s);if(s==si)System.out.println("thesame");if(s.equals(sl))System.out.printlnf'equals");A.thesameequalsB.equalsC.thesameD.op/0)q-.2.?ᑡᨵᐵJavaItuḄkvwxyḄYA.tuIzᨵᐹ|ḄST<ṹB.}fw⌕STfwtuᑣᵨᑮ"implements"ᐵFC.}fw⌕STfwtu,ᑣᵨᑮ"extends"ᐵFD.tuqᐕ3.?ᑡ<ṹḄ᡻n/0opY

53Stringsi="aaa";sl.concat("bbb");System.out.println(sl);A.Thestring"aaa".B.Thestring"aaabbb".C.Thestring"bbbaaa".D.Thestring"bbb".4.᝞0ᨵfwmyListener(ᐸImyListenerSTActionListenertu),?ᑡvᩩmyListenertᜐᳮᩭsmallButtonᢥḄ!8YA.smallButton.add(myListener);B.smallButton.addListener(myListener);C.smallButton.addActionListener(myListener);D.smallButton.addltem(myListener);.⚪1.O?ᑡ<ṹk.Ḅ஺importjava.io.*;publicclassTest{publicstaticvoidmain(String[]argv){try(BufferedReaderis=

54newBufferedReader(newInputStreamReader(System.in));StringinputLine;While((inputLine=is.readLine())!=null){System.out.println(inputLine);)is.close();}catch(lOExceptione){System.out.println("IOException:"+e);)))1ᫀ3O-ᐭ+ᑮᑮ-ᐭ""¡஺2ஹO?ᑡᑏ.xyḄ£n/0஺classtest{publicstaticvoidmain(String[]args){intx=9,y;if(x>=0)if(x>0)y=i;elsey=0;elsey=-l;System.out.println(y);

55)1ᫀ313ஹOᑏ.xyḄ£n/0஺publicclassFather{inta=100;publicvoidminer(){a-¤)publicstaticvoidmain(String[]args){Fatherx=newFather();Sony=newSon();System.out.println(y.a);System.out.println(y.getA());y.miner();System.out.println(y.a);System.out.println(y.getA());))classSonextendsFather{inta=0;publicvoidplus(){

56a++;publicintgetA(){returnsuper.a;))1ᫀ30100099¥.§1⚪1.Java¨Ḅᱯª஺13§ᓫឋ3Java¬®C++,¯°ᤴ²C++I³᧕µ¶┯¸Ḅᙢ☢ᔣ3Java¨Ḅ[\
ᐰ☢ᔣᑖ½¾3¿᡻n3ᏉÁឋ3Java6ÂᚗÄᦈÆᑴÇÈᜐᳮÆᑴÉnÊḄËÌÍÎUᐵឋ3Ïᐰឋ&Ð᝱ឋ2.jÒÓAWT8ÔË஺13/ᔠAWT8ÔËÖ×Øᩭk3importjava.awt.event.*;1.ÙÚÛÜSTX8ÙÚᘤḄtuclassMyFirstFrameextendsFrameimplementsActionListener

57{...}2.Þy8ÙÚᘤḄtuß¾publicvoidactionPerformed(ActionEventevent){,•,}3.MyFirstFrameÛÜSTtuActionListenerIḄᡠᨵ஺4.5áÙÚ."âMyFirstFrame5á"ãwᢥḄ8ÙÚÛÜᙠMyFirstFrameḄ᪀⌼çᦪIèé᝞?3cancelButton.addActionListener(this);okButton.addActionListener(this);3.ᙠJavaIê᪵#$fwÐY131ஹᩭSTRunnabletuclassTestThreadimplementsRunnable{publicvoidrun(){…})2ஹThreadᩭSTclassTestThreadextendsThread{TestThread(Stringname){super(name);start();)publicvoidrun(){•••}

58