Java2實用教程課后復習題參考答案

Java2實用教程課后習題參考答案第1章Java入門答：(1)編寫Java源文件:使用文本編輯器(Edit或記事本)，拓展名為.java (2)編譯Java源文件:使用Java編譯器(javac.exe)。得到字節(jié)碼文件*.class (3)運行Java程序:Java應用程序使用Java解釋器(java.exe)執(zhí)行字節(jié)碼文件；public主類必須用public修飾。②應用程序可以沒有public類；小應用程序一定有一個類是public類(主類)。用程序:如果只有一個類，源文件名與該類的類名相同，拓展名為.java；有多個類時，如果有public類(最多一個),源文件名與public類的類javapublic，源文件名與任何一個類的類名類的類名相同，拓展名是.java。小程序的HTML文件中可以使用codebase屬性指定小程序的字節(jié)碼所駐留的目錄。如果不使用codebase碼文件必須和運行它的HTML文件在同一目錄中。編寫一個小程序并將小程序的字節(jié)碼存放在某個目錄中，比如C:\5000；把運行該小程序的HTML文件(注意其中的codebase屬性):appletcode序的字節(jié)碼width=200height=300codebase=C:\5000>Java用程序源代碼licclassBoyextendsApplet{publicvoidpaint(Graphicsg){ColorColorredgdrawString邊學Java呢",5,30);ColorColorbluegdrawString,10,50);}}代碼命名為Boy.java并進行編譯得到Boy.class字節(jié)碼文件；將得到的字節(jié)碼文件存放在che車資料庫——學習資源共享專家③編寫小應用程序的HTML源文件:appletcodeBoyclasswdithheightcodebaseC:\5000></applet>編寫好的代碼命名為Boy.html；并將此文件存放在C:\5000文件夾以外的任意一個文件夾中(如C:\1000)；Boyhtml第2章標識符、關鍵字和數(shù)據(jù)類型美元符號和數(shù)字組成，并且第一個字符不能是數(shù)字字符，而且關鍵字不能作為標alassbreakpublicreturnstaticextends4.下列哪些語句是錯誤的:byteb=127;bx;bx是高級別的變量賦值給低級別的變量時,一定要用顯式轉換即b=(byte)x;。{publicstaticvoidmainStringargs[]){ongalongb00};System.out.println("數(shù)組b的長度:"+b.length);System.out.println("b[0]="+b[0]);}}b{publicstaticvoidmainStringargs[]){forintii322;i++){temoutprintlnchariche車資料庫——學習資源共享專家}}}佝佞佟你佡達ntSystemoutprintlnicclassOutputData{publicstaticvoidmainStringargs[]){intx=234,y=432;Systemoutprintlnx*x));Systemoutprint我輸出結果后不回車");Systemoutprintln我輸出結果后自動回車到下一行");Systemoutprintlnxy"+(x+y));Systemoutprintlnxy"=234432");}}xy62答:icclassXLWords{publicstaticvoidmainStringargs[]){forintiii+){System.out.print((char)i+"");}forintjjj+){System.out.print((char)j+"");}forintkkk){System.out.print((char)k+"");}forintttt++){che車資料庫——學習資源共享專家System.out.print((char)t+"");}}}第3章運算符、表達式和語句{publicstaticvoidmainStringargs[]){charxyez='吃';{}System.out.println(""+x+y+z);}}ublicclassE{publicstaticvoidmainStringargs[]){forintiii++){{bmoutprintcmoutprintckmoutprintcstemoutprint}}}}答:{publicstaticvoidmainStringargs[]){forintiii){rintjjij}System.out.println("1到10的階乘之和是:"+sum);}}答:{publicstaticvoidmainStringargs[]){forintiii+){intjjij{w=i%j;k}Systemoutprintlni數(shù)");}}}r}}}答:{publicstaticvoidmainStringargs[]){forintiii){rintjjij}System.out.println("1到10的階乘之和是:"+sum);}}答:{publicstaticvoidmainStringargs[]){forintiii+){intjjij{w=i%j;k}Systemoutprintlni數(shù)");}}}rixi{}Systemoutprintlnx數(shù)");}}}whilefor10項之和。r{publicstaticvoidmainStringargs[]){forintiii){a}outprintlnsum}}②while循環(huán){publicstaticvoidmainStringargs[]){while(++i<=10){a}outprintlnsum}}用程序，輸出滿足1+2+3+…+n<8888的最大正整數(shù)n。答:{publicstaticvoidmainStringargs[]){while(sum+=k)<8888)k--;Systemoutprintln取到:"+k);}}第4章類、對象和接口或者是參數(shù)的類型不同(方法的重載體現(xiàn)了多態(tài)性，即功能多態(tài)性)。作實例變量包中時，子類可以繼承父類的protected方法；而友好方法此時則不能被子staticstatic修飾。{}{{b/合法}}{}{publicvoidfunc{Ax10;//非法Ay20;//合法}}變量和方法？子類在什么情況下隱藏父類的成員變量和方法？在子類中是dsA包中時，子類可以繼承父類的除private屬性的所有方法和成員變量，當子類與變量和父類中的成員變量同名時，子類就隱藏了繼承的成員變量；子類中定義一個的名字、返回類型、參數(shù)個數(shù)和類型與從父類繼承的方法完全相同，子類就隱藏從父類繼承來的方法(方法的重寫)。BA接子類，當用子類B創(chuàng)建一個對象b并把這個對象的引用放到A類的對象a中icclassTakecare{tbfpublicstaticvoidmainStringargs[]){ystemoutprintlncc}}floatcab原因是類方法main操作了實例變量a。{publicintfintx){turnx}}{{publicintfintx){urnxx}}{publicstaticvoidmainStringargs[]){Aa=newB();fmoutprintlnm}}0{publicvoidsetXintx){}{turnx}}{publicvoidf(Aa){asetX);}}publicstaticvoidmainStringargs[]){Aa=newA();tXSystemoutprintlnagetXBbnewB();bfa;SystemoutprintlnagetX}}implements關鍵字，當一個類使用多個接口時，接口名要用逗號“，”隔abstract的所有方法，并且實現(xiàn)接口的方法時，方法名字、返回的完全一致；類在實現(xiàn)接口時，方法體一定要用public修飾，如voidreturn句。interface表面積{lAreadoubler}{ludoubler}classSphimplements表面積,體積{doublePIpublicdoubleallAreadoubler){eturnPIrr}publicdoublevoludoubler){returnPI*r*r*r;}}licclassTest{publicstaticvoidmainStringargs[]){leranewSphSystemoutprintln為5的球的表面積是:"+a.allArea(r));Systemoutprintln5的球的體積是:"+a.volu(r));}}fBBAf，子類創(chuàng)建的對象不僅可以調用方法f輸出英文字母表，而{oidf{rmmmSystem.out.print((char)m+"");ormmmSystem.out.print((char)m+"");System.out.println("");}}dsA{oidg{foriiiSystem.out.print((char)i+"");foriiiSystem.out.print((char)i+"");foriiiSystem.out.print((char)i+"");foriiiSystem.out.print((char)i+"");System.out.println("");}}licclassTest{publicstaticvoidmainStringargs[]){BbnewB();System.out.println("我調用方法f輸出英文字母表:");bf);System.out.println("我調用方法g輸出希臘字母表:");bg);}}MyExceptionStudent有一個產(chǎn)生異常的方法publicvoidsMyExceptionmMyExceptionmainStudentspeak方法。xceptionextendsException{ngstrMyExceptionintm){strm值大于1000";}publicvoidshowStr{moutprintlnstr}}{publicvoidspeakintmthrowsMyException{{MyExceptionexceptionnewMyException(m);n}outprintlnm}}licclassTest{publicstaticvoidmainStringagrs[]){dentstunewStudentm87;{m234;}hMyExceptione{}}}publicintfintaintb)，該方法返回a和b的最大公約數(shù)。然后再法f，而且重寫的方法將返回a和b的最小公倍數(shù)。要求在重寫隱藏的方法返回a和b的最大公約數(shù)m，然后將乘積(a*b)/m返回。要求類創(chuàng)建對象，并分別調用方法f計算兩個正整數(shù)的最大公約數(shù){publicintfinta,intb){{mp}while(r!=0){}urnb}}dsA{publicintfinta,intb){msuper.f(a,b);return(a*b)/m;}}licclassTest{publicstaticvoidmainStringargs[]){Aa=newA();Systemoutprintln18和102的最大公約數(shù)是:"+a.f(18,102));BbnewB();Systemoutprintln18和102的最小公倍數(shù)是:"+b.f(18,102));}}第5章字符串StringpublicStringtoUpperCase小寫字母變成大寫字母，publicStringtoLowerCase字符串中的大寫字母變成小寫字母。編寫一個程。{publicstaticvoidmainStringargs[]){tringstrIcanuseJavaSystemoutprintln的字符串是:"+str);ngsstrtoUpperCaseSystemoutprintln大寫字符串是:"+s);Systemoutprintln小寫字符串是:"+s);}}StringpublicStringconcat(Stringstr)方法可以把調用該方法的字符串與參數(shù)指定的字str一個新的串。編寫一個程序通過連接兩個串得到{publicstaticvoidmainStringargs[]){tringstrIcanuringstrseJavaringsstrconcatstrSystemoutprintln符串"+str1+"與字符串"+str2+"連接后得到的新字符串是:");outprintlns}}iccharcharAtintindexindex說ublicclassE{publicstaticvoidmainStringargs[]){Strings技術大學";charascharAtbscharAtmoutprintamoutprintlnb}}4.使用java.util包中的Arrays類的靜態(tài)方法publicstaticvoidsort(doublea[])可以把參數(shù)a指doublejavautil包中的Arrays類的靜態(tài)方法publicstaticvoidsortdoubleaintstartintend可以把參數(shù)a指定的double型數(shù)組中從位置start到end-1位ublicclassE{publicstaticvoidmainStringargs[]){tadoubleb0.87,34,678.987,-98.78,0.89};Arrays.sort(a);Arrays.sort(b,1,4);forintiii++){Systemoutprintai;}orintiiblengthi{Systemoutprintbi;}}}67,89,90,12.89,34.0,90.87,678.987,-98.78,0.89,javalangSystem類的靜態(tài)方法arraycopy可以實現(xiàn)數(shù)組的快速復制，上機實習下列程cclassArrayCopy{publicstaticvoidmainStringargs[]){charaab'c','d','e','f'},b1[]={'1','2','3','4','5','6'};Systemarraycopy(a1,0,b1,1,a1.length-1);System.out.println(newString(a1));System.out.println(newString(b1));bytea97,98,99,100,101,102},b2[]={65,67,68,69,70,71};Systemarraycopyb,a2,3,b2.length-3);System.out.println(newString(a2));System.out.println(newString(b2));}}CDEFGarraycopy是publicstaticvoidarraycopy(Objectsrc,intsrcPos,Objectdest,intsdestestPos第6章時間、日期和數(shù)字avautil{publicstaticvoidmainStringargs[]){Date=newDate();SimpleDateFormatsnewSimpleDateFormat("EHH時mm分ss秒");Systemoutprintlnsformat));}}avautil{publicstaticvoidmainStringargs[]){alendarfebCalendargetInstanceebsettdatfebgetCalendarDAYOFWEEKtringanewStringdatallDayrintiidati{a[i]="";}forintidatnidatallDayi+){a[i]=String.valueOf(n)+"";a[i]=String.valueOf(n)+"";}Systemoutprintln"+year+"年"+month+"月");orintjjalengthj{{System.out.println("");}emoutprintaj}}}某月、某日和某年、某月、某日之間的天數(shù)間隔。要求年、月、日通過main方法的參數(shù)傳avautil{publicstaticvoidmainStringargs[]){alendarcCalendargetInstanceetMillisetMillisongdayCoustimetimeSystemoutprintln2008年8月8日和2000年1月1日相隔"+dayCous+"天");}}avatextlicclassTest{publicstaticvoidmainStringargs[]){doubleaMathabs;System.out.println("-10的絕對值是:"+a);doublemaxNumMathmax4321);Systemoutprintln"123.456與-5.4321中的最大值是:"+maxNum);doubleminNumMathmin4321);Systemoutprintln"123.456與-5.4321中的最小值是:"+minNum);ntMathrandomSystemoutprintln一個1到10的隨機數(shù)是:"+randomNum);epowNumMathpowSystemoutprintln("2的10次冪是:"+powNum);esqrtNumMathsqrtSystemoutprintln("10的平方根是:"+sqrtNum);elogNumMathlogSystemoutprintln"2的對數(shù)是:"+logNum);doublesinNumMathsin;Systemoutprintln"-10的正弦值是:"+sinNum);oubleasinNumMathasinSystemoutprintln"0.5的反正弦值是:"+asinNum);Systemoutprintln之前的數(shù)是:"+sqrtNum);NumberFormatf=NumberFormat.getInstance();mumFractionDigitsmumIntegerDigitsngsfformatsqrtNumSystemoutprintln后:"+s);}}igIntegeravamathlicclassTest{publicstaticvoidmainStringargs[]){BigIntegersumnewBigInteger"0"),igIntegerNEnewBigIntegerwhile(++k<=30){ggmultiplyigmultiplyi}outprintlnsum}}第7章AWT組件及事件處理答:①Frame類對象的默認布局是BorderLayout布局;用程序，有一個標題為“計算的窗口”的窗口，窗口的布局為FlowLayout布局。窗口中添加兩個數(shù)時，另一個文本區(qū)，同時對輸入的數(shù)進行求和運算并avaawtlatedextendsFrameimplementsTextListener{TextAreatext1,text2;//定義了2個文本區(qū)CalculatedStrings/標題為“計算的窗口”的窗口{tLayoutnewFlowLayoutFlowLayoutwTextAreawTextAreatttextsetEditablefalse結果和平均值的文本區(qū)禁止編輯ListenerthisowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}Boundsate}publicvoidtextValueChanged(TextEvente){ingstextgetTextngTokenizergeshunewStringTokenizersanewdoublenrintiini{gtempgeshunextTokeneDoubleparseDoubletemp}averagerintiini{}sumntnulltextappendsum\n"+"平均數(shù):"+average);}}licclassTest{publicstaticvoidmainStringargs[]){CalculatedcalcnewCalculated("計算的窗口");}}getSelectedText方法獲取該文本區(qū)通過拖動鼠標選中的文件。編寫應用程序，有一為BorderLayout布局。窗口中添加兩個文本去和一個按鈕組avaawtwSelectedTextextendsFrameimplementsActionListener{TextAreatext1,text2;//定義2個文本區(qū)Buttonbutton//定義一個按鈕WindowSelectedText(Strings)//窗口名字為“挑單詞”{setLayoutnewBorderLayout//窗口布局是BorderLayout布局wTextAreawTextAreabuttonnewButton"確定");xtBorderLayoutEASTxtBorderLayoutWESTttonBorderLayoutSOUTHuttonaddActionListenerthisowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}tablefalseBoundsate}publicvoidactionPerformed(ActionEvente){{StringstextgetSelectedTextn;ingstrtextgetTextxtstrs}}}licclassTest{publicstaticvoidmainStringargs[]){newWindowSelectedText挑單詞");}}FlowLayout。設計4個按鈕，“除”，另外，窗口中還有3個文本框。單擊相應的按鈕，將兩個框中顯示結果。要求處理NumberFormatException。avaawtlatedextendsFrameimplementsActionListener{TextFieldtext1,text2,text3;//3個文本框ButtonbuttonH,buttonC,buttonJ,buttonS;//4個按鈕Calculated(Strings){setLayoutnewFlowLayout//FlowLayout布局extFieldextFieldextFieldnHnewnCnewnJnewnSnewdtextdtexttButton("加");Button("差");Button("積");Button("除");tablefalseonHonConJonSuttonHaddActionListenerthisuttonCaddActionListenerthisuttonJaddActionListenerthisuttonSaddActionListenerthisowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}Boundsate}publicvoidactionPerformed(ActionEvente){blenumnumtotle{numDoubleparseDoubletextgetText());numDoubleparseDoubletextgetText());{mtTexttotle}etSourcebuttonC{tTexttotle}etSourcebuttonJ{mtTexttotle}etSourcebuttonS{mtTexttotle}}rFormatExceptionevent{textsetText符!");}}}licclassTest{publicstaticvoidmainStringargs[]){CalculatedcalcnewCalculated("計算");//標題為“計算”的窗口}}ilEmailEmailavaxswingwBoxextendsFrameimplementsActionListener{TextFieldtexttexttext;tAreatextareaBoxbaseBoxboxV,boxV2;uttonbuttonWindowBox){buttonnewButton"確定");anewTextAreaextFieldextFieldextFieldboxVBoxcreateVerticalBox;boxVaddnewLabel""));boxVaddBoxcreateVerticalStrut8));boxVaddnewLabel"email"));boxVaddBoxcreateVerticalStrut8));boxVaddnewLabel("職業(yè)"));boxVBoxcreateVerticalBox;boxVaddtext;boxVaddBoxcreateVerticalStrut8));boxVaddtext;boxVaddBoxcreateVerticalStrut8));boxVaddtext;baseBoxBoxcreateHorizontalBox();baseBoxaddboxVbaseBoxaddBoxcreateHorizontalStrut(10));baseBoxaddboxVwLayoutBoxonareaowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}EditablefalseuttonaddActionListenerthisBoundsate}publicvoidactionPerformed(ActionEvente){booleana;Strings;{a=s.endsWith(".");bsindexOf");{StringstrtextgetTextn"+text2.getText()+"\n"+text3.getText()+"\n";ingstrtextareagetTextsetTextstrstr}{textsetTextE-mail地址");}}}}licclassTest{publicstaticvoidmainStringargs[]){indowBox}}應用程序，要求編寫一個Panel的子類MyPanel，MyPanel中有一個文本框和一個按鈕，要求vent并將該文本作為按鈕的名稱。然后在編寫一個Frame的子類，即窗口。窗口的布局為BorderLayout布MyPanelavaawtelextendsPanelimplementsActionListener{mextFieldtextuttonbuttonMyPanel){xtFieldbuttonnewButton"確定");onuttonaddActionListenerthisowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}}publicvoidactionPerformed(ActionEvente){{ametextgetTextbuttonsetLabelname}}}eextendsFrame{MyPanelpanel1,panel2;MyFrame){anelnewMyPanelanelnewMyPanelnelBorderLayoutEASTnelBorderLayoutWESTBoundsate}}licclassTest{publicstaticvoidmainStringargs[]){MyFramewin=newMyFrame();}}18編寫一個應用程序，要求有一個畫布，在畫布上繪制一個矩形，用戶通過文本框輸入矩。avaawtasextendsCanvas{Mycanvas){lorcyan}publicvoidsetXintx){}publicvoidsetY(inty){}blicvoidsetWintw{}publicvoidsetHinth){}publicvoidpaint(Graphicsg){ectxywh}}wCanvasextendsFrameimplementsActionListener{Mycanvascanvas;TextFieldtexttexttext,text4;uttonbuttonWindowCanvas{ycanvasxtFieldxtFieldxtFieldxtFieldPanelpNorthnewPanel,pSouth=newPanel();buttonnewButton"確定");uttonaddActionListenerthispNorth.add(newLabel("矩形的寬:"));NorthaddtextpNorth.add(newLabel("矩形的高:"));NorthaddtextpSouthaddnewLabel("左上角位置坐標:"));SouthaddtextSouthaddtextouthaddbuttonowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}vasBorderLayoutCENTERrthBorderLayoutNORTHouthBorderLayoutSOUTHBoundsate}publicvoidactionPerformed(ActionEvente){{xIntegerparseInttextgetText;IntegerparseInttextgetTextw=Integer.parseInt(text3.getText());hIntegerparseInttextgetText());XxYyWwHhnt}mberFormatExceptionee{xyw;h=0;}}}licclassTest{publicstaticvoidmainStringargs[]){indowCanvas}}取它的默認布局:BorderLayout布局,北面添加一個List組心添加一個文本區(qū)，當選擇List組件中的某個選項后，文本區(qū)avaawtowGoodsextendsFrameimplementsActionListenerItemListener{Strings"產(chǎn)地:","產(chǎn)地:","產(chǎn)地:","產(chǎn)地:"};Stringp{"價格:3200","價格:158","價格:13.2","價格:320/打"};Stringa{"本商品****","本商品*****","本商品******","本商品*******"};istlistxtAreatextWindowGoods){TextAreaablefalsetBorderLayoutNORTHtBorderLayoutCENTERisthisowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}Boundsate}publicvoiditemStateChanged(ItemEvente){ist{dextsetTextpmnsm}}publicvoidactionPerformed(ActionEvente){dexxtan}}licclassTest{publicstaticvoidmainStringargs[]){indowGoods}}avaawtwColorextendsFrameimplementsActionListener{Buttonbutton//按鈕TextFieldtextfield/文本框TextAreatextarea文本區(qū)Mypanelpanel;//面板CheckboxboxChoicechoice拉列表Listlist動列表Labellabel簽Mycanvascan//畫布uttonbuttonBackColorbuttonForeColorWindowColor){buttonnewButton"我是按鈕");textfieldnewTextField,10);anewTextAreaextareasetTexttEditablefalseEditablefalsenelnewMypanelboxnewCheckbox("我是選擇框");hoicechoiceadd;lnvasbuttonBackColornewButton("背景色");buttonForeColornewButton("前景色");wLayoutonfieldarealcelnBackColornForeColorowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}uttonBackColoraddActionListenerthisuttonForeColoraddActionListenerthisBoundsate}publicvoidactionPerformed(ActionEvente){kColor{buttonsetBackgroundColoryellowetBackgroundColoryellowtBackgroundColoryellowpanelsetBackgroundColoryellowboxsetBackgroundColoryellowBackgroundColoryelloworyellowloryellowkgroundColoryellow}etSourcebuttonForeColor{buttonsetForeground(Color.blue);eldsetForegroundColorblueeasetForegroundColorbluepanelsetForeground(Color.blue);boxsetForeground(Color.blue);esetForegroundColorbluedColorbluendColorbluetForegroundColorblue}}}asextendsCanvas{Mycanvas(){}publicvoidpaint(Graphicsg){gdrawString,5);}}lextendsPanel{ButtonbuttonMypanel){button=newButton("我是面板");ton}}licclassTest{publicstaticvoidmainStringargs[])}}ullavaawtwMoveextendsFrameimplementsActionListener{Buttonbuttonbutton2;WindowMove(Strings){button=newButton("我讓它橫向走動");button=newButton("我讓它縱向走動");button.setBackground(Color.blue);button.setBackground(Color.green);buttonaddActionListenerthisbuttonaddActionListenerthisbuttonsetCursorCursorgetPredefinedCursorCursorHAND_CURSOR));buttonsetCursorCursorgetPredefinedCursorCursorHAND_CURSOR));tontonowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}buttonsetBounds,80,100,30);buttonsetBounds0,180,100,30);Boundsate}publicvoidactionPerformed(ActionEvente){RectanglerectbuttongetBounds;RectanglerectbuttongetBounds;{buttonsetLocationxy2);}getSourcebutton{buttonsetLocationxy1);}}}licclassTest{publicstaticvoidmainStringargs[]){newWindowMove動");}}窗口的布局為null，在窗口中有3個按鈕和一個avaawtwChangeColorextendsFrameimplementsActionListener{ButtonbuttonRedbuttonGreenbuttonBlueMycanvascanvas;WindowChangeColor(Strings){buttonRednewButton("紅色");buttonGreennewButton("綠色");buttonBluenewButton"藍色");ycanvasbuttonRedsetBackground(Color.red);buttonGreensetBackground(Color.green);buttonBluesetBackground(Color.blue);ascanvassetBounds);onRedbuttonRedsetBounds170,50,30);onGreenbuttonGreensetBounds170,50,30);onBluebuttonBluesetBounds,170,50,30);uttonRedaddActionListenerthisuttonGreenaddActionListenerthisuttonBlueaddActionListenerthisowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}Boundsate}publicvoidactionPerformed(ActionEvente){d{tXnt}etSourcebuttonGreen{tXnt}etSourcebuttonBlue{tXnt}}}asextendsCanvas{Mycanvas){white}publicvoidsetX(inty){}publicvoidpaint(Graphicsg){case1:ColorColorredkColorColorgreenkColorColorbluekColorwhite}gdrawOval;}}licclassTest{publicstaticvoidmainStringargs[]){newWindowChangeColor"改變顏色");}}avaawtwCursorextendsFrameimplementsActionListener{Buttonbuttonbutton;xtFieldtextWindowCursor{buttonnewButton"單擊我");textnewTextField按鈕上看形狀");button=newButton("看看你鼠標的形狀");tonBorderLayoutNORTHttonBorderLayoutCENTERxtBorderLayoutSOUTHbuttonsetBackgroundColorcyan);button.setBackground(Color.pink);uttonaddActionListenerthisowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}Boundsate}publicvoidactionPerformed(ActionEvente){licclassTest{nn0;{buttonsetCursorCursorgetPredefinedCursorCursorHAND_CURSOR));kcase1:buttonsetCursorCursorgetPredefinedCursorCursorCROSSHAIR_CURSOR));kbuttonsetCursorCursorgetPredefinedCursorCursorTEXT_CURSOR));kbuttonsetCursorCursorgetPredefinedCursorCursorWAIT_CURSOR));kbuttonsetCursorCursorgetPredefinedCursorCursorN_RESIZE_CURSOR));kbuttonsetCursorCursorgetPredefinedCursorCursorNW_RESIZE_CURSOR));kbuttonsetCursorCursorgetPredefinedCursorCursorNE_RESIZE_CURSOR));kbuttonsetCursorCursorgetPredefinedCursorCursorW_RESIZE_CURSOR));kbuttonsetCursorCursorgetPredefinedCursorCursorMOVE_CURSOR));kbuttonsetCursorCursorgetPredefinedCursorCursorDEFAULT_CURSOR));k}}}publicstaticvoidmainStringargs[]){indowCursor}}狀avaawtilitiesxtendsFrameimplementsMouseListenerMouseMotionListener{uttonbuttonxtFieldtextleanmovefalseWin){button=newButton("用鼠標拖動我");textnewTextField8);tBackgroundColorgreenbuttonsetBackground(Color.blue);uttonaddMouseListenerthisttonaddMouseMotionListenerthisListenerthisMotionListenerthisMotionListenerthiswLayoutonowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}undsate}publicvoidmousePressedMouseEvente){}publicvoidmouseReleased(MouseEvente){movefalseectanglerectbuttongetBoundstgetBounds{{blefalse}etSourcetext{uttonsetVisiblefalse}}}publicvoidmouseEnteredMouseEvente){}publicvoidmouseExitedMouseEvente){}publicvoidmouseClickedMouseEvente){}publicvoidmouseMovedMouseEvente){}publicvoidmouseDragged(MouseEvente){onentnullofComponent{ComponentegetSourcemovetruelitiesconvertMouseEventethis{getXtYintw=.getSize().width,hgetSizeheight;tionxwyh}}}}licclassTest{publicstaticvoidmainStringargs[]){Winwin=newWin();}}avaawttendsFrameimplementsKeyListener{Buttonb=newButton[8];Win){wLayoutorintiii{binewButton"+i);biaddKeyListenerthis;}owListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}undsate}publicvoidkeyPressed(KeyEvente){leanmovefalseButtonbuttonButton)e.getSource();ectanglebuttonrectbuttongetBoundsngstrbuttongetLabelrttongetBoundsxybuttongetBoundsyntVKUP{y}egetKeyCodeKeyEventVKDOWN{}egetKeyCodeKeyEventVKLEFT{xx;}egetKeyCodeKeyEventVKRIGHT{}buttonrectsetLocationxyintkkk{RectanglerectbkgetBounds;tersectsrectxxk{movetrue}}{buttonsetLocationxy}}publicvoidkeyTypedKeyEvente){}publicvoidkeyReleasedKeyEvente){}}licclassTest{publicstaticvoidmainStringargs[]){Winwin=newWin();}}第8章建立對話框否繼續(xù)將該數(shù)javaawteventPanewSaveNumberextendsFrameimplementsActionListener{FieldtextInputNumberAreatextSaveNumberWindowSaveNumber{NumbernewTextFieldbernewTextAreatInputNumberBorderLayoutNORTHtSaveNumberBorderLayoutCENTERberaddActionListenerthisBoundsateowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}}publicvoidactionPerformed(ActionEvente){ngstextInputNumbergetText{NumberappendnsmbersetTextnull}{intnJOptionPaneshowConfirmDialogthis繼續(xù)將該數(shù)onPaneYESNOOPTIONN{Numberappendns}ptionPaneNOOPTION{mbersetTextnull}}}}licclassTest{publicstaticvoidmainStringargs[]){indowSaveNumber}}avaawtPaneadextendsFrameimplementsActionListener{MenuBarmenubar;Menumenu1,menu2,menu3,menu5;MenuItemitem[]=newMenuItem[23];xtAreatextFileDialogfiledialogsave;FileDialogfiledialog_load;Notepad(Strings){menubarnewMenuBar);menu1=newMenu("文件");menu2=newMenu("編輯");menu3=newMenu("格式");menu5=newMenu("幫助");temewMenuShortcutKeyEventVKNtemewMenuShortcutKeyEventVKOtemutnewMenuShortcutKeyEventVKSuItemtemewMenuShortcutKeyEventVKPtemtemewMenuShortcutKeyEventVKZtemewMenuShortcutKeyEventVKXtemewMenuShortcutKeyEventVKCemnewMenuShortcutKeyEventVKVememwMenuItememememenuItemMenuItemwMenuItemAreafiledialogsavenewFileDialogthis存文件",FileDialog.SAVE);filedialogloadnewFileDialogthis文件",FileDialog.LOAD);ogsavesetVisiblefalseogloadsetVisiblefalseogsaveaddWindowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){ogsavesetVisiblefalse}}ogloadaddWindowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){ogloadsetVisiblefalse}}menuadd(item[0]);menuadd(item[1]);menuadd(item[3]);menuaddSeparator();menuadd(item[4]);menuadd(item[5]);menuaddSeparator();menuadd(item[6]);menuadd(item[7]);menuaddSeparator();menuadd(item[8]);menuadd(item[9]);menuadd(item[10]);menuadd(item[11]);menuaddSeparator();menuadd(item[12]);menuadd(item[13]);menuadd(item[14]);menuadd(item[15]);menuaddSeparator();menuadd(item[16]);menuadd(item[17]);menuadd(item[18]);menuadd(item[21]);menuaddSeparator();menuadd(item[22]);menubaraddmenu1);menubaraddmenu2);menubaraddmenu3);menubaraddmenu5);thisthisthisthisrthisrthistBorderLayoutCENTERBoundsdowListenernewWindowAdapterpublicvoidwindowClosing(WindowEvente){emexit}}ate}publicvoidactionPerformed(ActionEvente){rceitem{null}elseifegetSourceitem//完成打開{ogloadsetVisibletrue}elseifegetSourceitem//完成保存{ogsavesetVisibletrue}elseifegetSourceitem//完成退出{emexit}ifegetSourceitem{JOptionPaneshowMessageDialogthis中有很多功能沒有實現(xiàn)\n剩余功能正n幫助主題",JOptionPane.INFORMATION_MESSAGE);}ifegetSourceitem{JOptionPaneshowMessageDialogthis自己做的NotePad\n作者:王財\n版本:NotePad1.1\n運行平臺:Windows平臺","關于記事本}}}licclassTest{publicstaticvoidmain(String[]args){}}第9章Java多線程機制CPU。art程在什么狀態(tài)時，調用isAlive()方法返回的值是false。態(tài)時，線程調用調用isAlive()方法返回的值是false。Thread個線程；創(chuàng)建時要向構造方法Thread(Runnabletarget)傳遞一個RunnablereadrunsetPriorityintgrade的int型參數(shù)。上線程同時訪問同一個變量，并且一個線程需要修改這個變量時4中的循環(huán)條件:while(五元錢的個數(shù)<3)改寫成:interrupt程。即:它所完成的是當線程處于阻塞狀態(tài)時，拋出InterruptedExceptioninterrupt方法不會中斷一個正在運行線程，一個負責模仿垂直上拋運動，另一個模仿45°的拋體avaawtlicclassTest{publicstaticvoidmainStringargs[]){MyFrameframe=newMyFrame();framesetBounds00);isibletrueindowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}}ameextendsFrameimplementsRunnable{Thread紅色球,藍色球;MyCanvasred,blue;MyFrame){dthisdnewMyCanvasColorredbluenewMyCanvasColorblueredsetLocation0);bluesetLocation100);}ublicvoidrun{while(true){entThread{tdsetLocationxh}nterruptedExceptione}lseifThreadcurrentThread{tbluesetLocationxh}nterruptedExceptione}}}}asextendsCanvas{Colorc;MyCanvas(Colorc){}publicvoidpaint(Graphicsg){cfillOval}}、某和某買電影票，售票員只有3五元的錢，電影，某排在某的前面拿一十元的人avaawtlicclassTest{publicstaticvoidmainStringargs[]){yFrame}}eextendsFramestener{售票員王小姐;Thread某,某,某;extButtonstart=newButton("排隊買票");MyFrame){readthisadthisadthiswTextAreate