Java2实用教程课后复习题参考答案

Java2实用教程课后习题参考答案第1章Java入门答：(1)编写Java源文件:使用文本编辑器(Edit或记事本)，拓展名为.java (2)编译Java源文件:使用Java编译器(javac.exe)。得到字节码文件*.class (3)运行Java程序:Java应用程序使用Java解释器(java.exe)执行字节码文件；public主类必须用public修饰。②应用程序可以没有public类；小应用程序一定有一个类是public类(主类)。用程序:如果只有一个类，源文件名与该类的类名相同，拓展名为.java；有多个类时，如果有public类(最多一个),源文件名与public类的类javapublic，源文件名与任何一个类的类名类的类名相同，拓展名是.java。小程序的HTML文件中可以使用codebase属性指定小程序的字节码所驻留的目录。如果不使用codebase码文件必须和运行它的HTML文件在同一目录中。编写一个小程序并将小程序的字节码存放在某个目录中，比如C:\5000；把运行该小程序的HTML文件(注意其中的codebase属性):appletcode序的字节码width=200height=300codebase=C:\5000>Java用程序源代码licclassBoyextendsApplet{publicvoidpaint(Graphicsg){ColorColorredgdrawString边学Java呢",5,30);ColorColorbluegdrawString,10,50);}}代码命名为Boy.java并进行编译得到Boy.class字节码文件；将得到的字节码文件存放在che车资料库——学习资源共享专家③编写小应用程序的HTML源文件:appletcodeBoyclasswdithheightcodebaseC:\5000></applet>编写好的代码命名为Boy.html；并将此文件存放在C:\5000文件夹以外的任意一个文件夹中(如C:\1000)；Boyhtml第2章标识符、关键字和数据类型美元符号和数字组成，并且第一个字符不能是数字字符，而且关键字不能作为标alassbreakpublicreturnstaticextends4.下列哪些语句是错误的:byteb=127;bx;bx是高级别的变量赋值给低级别的变量时,一定要用显式转换即b=(byte)x;。{publicstaticvoidmainStringargs[]){ongalongb00};System.out.println("数组b的长度:"+b.length);System.out.println("b[0]="+b[0]);}}b{publicstaticvoidmainStringargs[]){forintii322;i++){temoutprintlnchariche车资料库——学习资源共享专家}}}佝佞佟你佡达ntSystemoutprintlnicclassOutputData{publicstaticvoidmainStringargs[]){intx=234,y=432;Systemoutprintlnx*x));Systemoutprint我输出结果后不回车");Systemoutprintln我输出结果后自动回车到下一行");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车资料库——学习资源共享专家System.out.print((char)t+"");}}}第3章运算符、表达式和语句{publicstaticvoidmainStringargs[]){charxyez='吃';{}System.out.println(""+x+y+z);}}ublicclassE{publicstaticvoidmainStringargs[]){forintiii++){{bmoutprintcmoutprintckmoutprintcstemoutprint}}}}答:{publicstaticvoidmainStringargs[]){forintiii){rintjjij}System.out.println("1到10的阶乘之和是:"+sum);}}答:{publicstaticvoidmainStringargs[]){forintiii+){intjjij{w=i%j;k}Systemoutprintlni数");}}}r}}}答:{publicstaticvoidmainStringargs[]){forintiii){rintjjij}System.out.println("1到10的阶乘之和是:"+sum);}}答:{publicstaticvoidmainStringargs[]){forintiii+){intjjij{w=i%j;k}Systemoutprintlni数");}}}rixi{}Systemoutprintlnx数");}}}whilefor10项之和。r{publicstaticvoidmainStringargs[]){forintiii){a}outprintlnsum}}②while循环{publicstaticvoidmainStringargs[]){while(++i<=10){a}outprintlnsum}}用程序，输出满足1+2+3+…+n<8888的最大正整数n。答:{publicstaticvoidmainStringargs[]){while(sum+=k)<8888)k--;Systemoutprintln取到:"+k);}}第4章类、对象和接口或者是参数的类型不同(方法的重载体现了多态性，即功能多态性)。作实例变量包中时，子类可以继承父类的protected方法；而友好方法此时则不能被子staticstatic修饰。{}{{b/合法}}{}{publicvoidfunc{Ax10;//非法Ay20;//合法}}变量和方法？子类在什么情况下隐藏父类的成员变量和方法？在子类中是dsA包中时，子类可以继承父类的除private属性的所有方法和成员变量，当子类与变量和父类中的成员变量同名时，子类就隐藏了继承的成员变量；子类中定义一个的名字、返回类型、参数个数和类型与从父类继承的方法完全相同，子类就隐藏从父类继承来的方法(方法的重写)。BA接子类，当用子类B创建一个对象b并把这个对象的引用放到A类的对象a中icclassTakecare{tbfpublicstaticvoidmainStringargs[]){ystemoutprintlncc}}floatcab原因是类方法main操作了实例变量a。{publicintfintx){turnx}}{{publicintfintx){urnxx}}{publicstaticvoidmainStringargs[]){Aa=newB();fmoutprintlnm}}0{publicvoidsetXintx){}{turnx}}{publicvoidf(Aa){asetX);}}publicstaticvoidmainStringargs[]){Aa=newA();tXSystemoutprintlnagetXBbnewB();bfa;SystemoutprintlnagetX}}implements关键字，当一个类使用多个接口时，接口名要用逗号“，”隔abstract的所有方法，并且实现接口的方法时，方法名字、返回的完全一致；类在实现接口时，方法体一定要用public修饰，如voidreturn句。interface表面积{lAreadoubler}{ludoubler}classSphimplements表面积,体积{doublePIpublicdoubleallAreadoubler){eturnPIrr}publicdoublevoludoubler){returnPI*r*r*r;}}licclassTest{publicstaticvoidmainStringargs[]){leranewSphSystemoutprintln为5的球的表面积是:"+a.allArea(r));Systemoutprintln5的球的体积是:"+a.volu(r));}}fBBAf，子类创建的对象不仅可以调用方法f输出英文字母表，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("我调用方法f输出英文字母表:");bf);System.out.println("我调用方法g输出希腊字母表:");bg);}}MyExceptionStudent有一个产生异常的方法publicvoidsMyExceptionmMyExceptionmainStudentspeak方法。xceptionextendsException{ngstrMyExceptionintm){strm值大于1000";}publicvoidshowStr{moutprintlnstr}}{publicvoidspeakintmthrowsMyException{{MyExceptionexceptionnewMyException(m);n}outprintlnm}}licclassTest{publicstaticvoidmainStringagrs[]){dentstunewStudentm87;{m234;}hMyExceptione{}}}publicintfintaintb)，该方法返回a和b的最大公约数。然后再法f，而且重写的方法将返回a和b的最小公倍数。要求在重写隐藏的方法返回a和b的最大公约数m，然后将乘积(a*b)/m返回。要求类创建对象，并分别调用方法f计算两个正整数的最大公约数{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的最大公约数是:"+a.f(18,102));BbnewB();Systemoutprintln18和102的最小公倍数是:"+b.f(18,102));}}第5章字符串StringpublicStringtoUpperCase小写字母变成大写字母，publicStringtoLowerCase字符串中的大写字母变成小写字母。编写一个程。{publicstaticvoidmainStringargs[]){tringstrIcanuseJavaSystemoutprintln的字符串是:"+str);ngsstrtoUpperCaseSystemoutprintln大写字符串是:"+s);Systemoutprintln小写字符串是:"+s);}}StringpublicStringconcat(Stringstr)方法可以把调用该方法的字符串与参数指定的字str一个新的串。编写一个程序通过连接两个串得到{publicstaticvoidmainStringargs[]){tringstrIcanuringstrseJavaringsstrconcatstrSystemoutprintln符串"+str1+"与字符串"+str2+"连接后得到的新字符串是:");outprintlns}}iccharcharAtintindexindex说ublicclassE{publicstaticvoidmainStringargs[]){Strings技术大学";charascharAtbscharAtmoutprintamoutprintlnb}}4.使用java.util包中的Arrays类的静态方法publicstaticvoidsort(doublea[])可以把参数a指doublejavautil包中的Arrays类的静态方法publicstaticvoidsortdoubleaintstartintend可以把参数a指定的double型数组中从位置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类的静态方法arraycopy可以实现数组的快速复制，上机实习下列程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章时间、日期和数字avautil{publicstaticvoidmainStringargs[]){Date=newDate();SimpleDateFormatsnewSimpleDateFormat("EHH时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、某日之间的天数间隔。要求年、月、日通过main方法的参数传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的绝对值是:"+a);doublemaxNumMathmax4321);Systemoutprintln"123.456与-5.4321中的最大值是:"+maxNum);doubleminNumMathmin4321);Systemoutprintln"123.456与-5.4321中的最小值是:"+minNum);ntMathrandomSystemoutprintln一个1到10的随机数是:"+randomNum);epowNumMathpowSystemoutprintln("2的10次幂是:"+powNum);esqrtNumMathsqrtSystemoutprintln("10的平方根是:"+sqrtNum);elogNumMathlogSystemoutprintln"2的对数是:"+logNum);doublesinNumMathsin;Systemoutprintln"-10的正弦值是:"+sinNum);oubleasinNumMathasinSystemoutprintln"0.5的反正弦值是:"+asinNum);Systemoutprintln之前的数是:"+sqrtNum);NumberFormatf=NumberFormat.getInstance();mumFractionDigitsmumIntegerDigitsngsfformatsqrtNumSystemoutprintln后:"+s);}}igIntegeravamathlicclassTest{publicstaticvoidmainStringargs[]){BigIntegersumnewBigInteger"0"),igIntegerNEnewBigIntegerwhile(++k<=30){ggmultiplyigmultiplyi}outprintlnsum}}第7章AWT组件及事件处理答:①Frame类对象的默认布局是BorderLayout布局;用程序，有一个标题为“计算的窗口”的窗口，窗口的布局为FlowLayout布局。窗口中添加两个数时，另一个文本区，同时对输入的数进行求和运算并avaawtlatedextendsFrameimplementsTextListener{TextAreatext1,text2;//定义了2个文本区CalculatedStrings/标题为“计算的窗口”的窗口{tLayoutnewFlowLayoutFlowLayoutwTextAreawTextAreatttextsetEditablefalse结果和平均值的文本区禁止编辑ListenerthisowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}Boundsate}publicvoidtextValueChanged(TextEvente){ingstextgetTextngTokenizergeshunewStringTokenizersanewdoublenrintiini{gtempgeshunextTokeneDoubleparseDoubletemp}averagerintiini{}sumntnulltextappendsum\n"+"平均数:"+average);}}licclassTest{publicstaticvoidmainStringargs[]){CalculatedcalcnewCalculated("计算的窗口");}}getSelectedText方法获取该文本区通过拖动鼠标选中的文件。编写应用程序，有一为BorderLayout布局。窗口中添加两个文本去和一个按钮组avaawtwSelectedTextextendsFrameimplementsActionListener{TextAreatext1,text2;//定义2个文本区Buttonbutton//定义一个按钮WindowSelectedText(Strings)//窗口名字为“挑单词”{setLayoutnewBorderLayout//窗口布局是BorderLayout布局wTextAreawTextAreabuttonnewButton"确定");xtBorderLayoutEASTxtBorderLayoutWESTttonBorderLayoutSOUTHuttonaddActionListenerthisowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}tablefalseBoundsate}publicvoidactionPerformed(ActionEvente){{StringstextgetSelectedTextn;ingstrtextgetTextxtstrs}}}licclassTest{publicstaticvoidmainStringargs[]){newWindowSelectedText挑单词");}}FlowLayout。设计4个按钮，“除”，另外，窗口中还有3个文本框。单击相应的按钮，将两个框中显示结果。要求处理NumberFormatException。avaawtlatedextendsFrameimplementsActionListener{TextFieldtext1,text2,text3;//3个文本框ButtonbuttonH,buttonC,buttonJ,buttonS;//4个按钮Calculated(Strings){setLayoutnewFlowLayout//FlowLayout布局extFieldextFieldextFieldnHnewnCnewnJnewnSnewdtextdtexttButton("加");Button("差");Button("积");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("计算");//标题为“计算”的窗口}}ilEmailEmailavaxswingwBoxextendsFrameimplementsActionListener{TextFieldtexttexttext;tAreatextareaBoxbaseBoxboxV,boxV2;uttonbuttonWindowBox){buttonnewButton"确定");anewTextAreaextFieldextFieldextFieldboxVBoxcreateVerticalBox;boxVaddnewLabel""));boxVaddBoxcreateVerticalStrut8));boxVaddnewLabel"email"));boxVaddBoxcreateVerticalStrut8));boxVaddnewLabel("职业"));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}}应用程序，要求编写一个Panel的子类MyPanel，MyPanel中有一个文本框和一个按钮，要求vent并将该文本作为按钮的名称。然后在编写一个Frame的子类，即窗口。窗口的布局为BorderLayout布MyPanelavaawtelextendsPanelimplementsActionListener{mextFieldtextuttonbuttonMyPanel){xtFieldbuttonnewButton"确定");onuttonaddActionListenerthisowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}}publicvoidactionPerformed(ActionEvente){{ametextgetTextbuttonsetLabelname}}}eextendsFrame{MyPanelpanel1,panel2;MyFrame){anelnewMyPanelanelnewMyPanelnelBorderLayoutEASTnelBorderLayoutWESTBoundsate}}licclassTest{publicstaticvoidmainStringargs[]){MyFramewin=newMyFrame();}}18编写一个应用程序，要求有一个画布，在画布上绘制一个矩形，用户通过文本框输入矩。avaawtasextendsCanvas{Mycanvas){lorcyan}publicvoidsetXintx){}publicvoidsetY(inty){}blicvoidsetWintw{}publicvoidsetHinth){}publicvoidpaint(Graphicsg){ectxywh}}wCanvasextendsFrameimplementsActionListener{Mycanvascanvas;TextFieldtexttexttext,text4;uttonbuttonWindowCanvas{ycanvasxtFieldxtFieldxtFieldxtFieldPanelpNorthnewPanel,pSouth=newPanel();buttonnewButton"确定");uttonaddActionListenerthispNorth.add(newLabel("矩形的宽:"));NorthaddtextpNorth.add(newLabel("矩形的高:"));NorthaddtextpSouthaddnewLabel("左上角位置坐标:"));SouthaddtextSouthaddtextouthaddbuttonowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}vasBorderLayoutCENTERrthBorderLayoutNORTHouthBorderLayoutSOUTHBoundsate}publicvoidactionPerformed(ActionEvente){{xIntegerparseInttextgetText;IntegerparseInttextgetTextw=Integer.parseInt(text3.getText());hIntegerparseInttextgetText());XxYyWwHhnt}mberFormatExceptionee{xyw;h=0;}}}licclassTest{publicstaticvoidmainStringargs[]){indowCanvas}}取它的默认布局:BorderLayout布局,北面添加一个List组心添加一个文本区，当选择List组件中的某个选项后，文本区avaawtowGoodsextendsFrameimplementsActionListenerItemListener{Strings"产地:","产地:","产地:","产地:"};Stringp{"价格:3200","价格:158","价格:13.2","价格: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//按钮TextFieldtextfield/文本框TextAreatextarea文本区Mypanelpanel;//面板CheckboxboxChoicechoice拉列表Listlist动列表Labellabel签Mycanvascan//画布uttonbuttonBackColorbuttonForeColorWindowColor){buttonnewButton"我是按钮");textfieldnewTextField,10);anewTextAreaextareasetTexttEditablefalseEditablefalsenelnewMypanelboxnewCheckbox("我是选择框");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("我让它横向走动");button=newButton("我让它纵向走动");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动");}}窗口的布局为null，在窗口中有3个按钮和一个avaawtwChangeColorextendsFrameimplementsActionListener{ButtonbuttonRedbuttonGreenbuttonBlueMycanvascanvas;WindowChangeColor(Strings){buttonRednewButton("红色");buttonGreennewButton("绿色");buttonBluenewButton"蓝色");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"改变颜色");}}avaawtwCursorextendsFrameimplementsActionListener{Buttonbuttonbutton;xtFieldtextWindowCursor{buttonnewButton"单击我");textnewTextField按钮上看形状");button=newButton("看看你鼠标的形状");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}}状avaawtilitiesxtendsFrameimplementsMouseListenerMouseMotionListener{uttonbuttonxtFieldtextleanmovefalseWin){button=newButton("用鼠标拖动我");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章建立对话框否继续将该数javaawteventPanewSaveNumberextendsFrameimplementsActionListener{FieldtextInputNumberAreatextSaveNumberWindowSaveNumber{NumbernewTextFieldbernewTextAreatInputNumberBorderLayoutNORTHtSaveNumberBorderLayoutCENTERberaddActionListenerthisBoundsateowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}}publicvoidactionPerformed(ActionEvente){ngstextInputNumbergetText{NumberappendnsmbersetTextnull}{intnJOptionPaneshowConfirmDialogthis继续将该数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("编辑");menu3=newMenu("格式");menu5=newMenu("帮助");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//完成打开{ogloadsetVisibletrue}elseifegetSourceitem//完成保存{ogsavesetVisibletrue}elseifegetSourceitem//完成退出{emexit}ifegetSourceitem{JOptionPaneshowMessageDialogthis中有很多功能没有实现\n剩余功能正n帮助主题",JOptionPane.INFORMATION_MESSAGE);}ifegetSourceitem{JOptionPaneshowMessageDialogthis自己做的NotePad\n作者:王财\n版本:NotePad1.1\n运行平台:Windows平台","关于记事本}}}licclassTest{publicstaticvoidmain(String[]args){}}第9章Java多线程机制CPU。art程在什么状态时，调用isAlive()方法返回的值是false。态时，线程调用调用isAlive()方法返回的值是false。Thread个线程；创建时要向构造方法Thread(Runnabletarget)传递一个RunnablereadrunsetPriorityintgrade的int型参数。上线程同时访问同一个变量，并且一个线程需要修改这个变量时4中的循环条件:while(五元钱的个数<3)改写成:interrupt程。即:它所完成的是当线程处于阻塞状态时，抛出InterruptedExceptioninterrupt方法不会中断一个正在运行线程，一个负责模仿垂直上抛运动，另一个模仿45°的抛体avaawtlicclassTest{publicstaticvoidmainStringargs[]){MyFrameframe=newMyFrame();framesetBounds00);isibletrueindowListenernewWindowAdapter{publicvoidwindowClosing(WindowEvente){emexit}}}ameextendsFrameimplementsRunnable{Thread红色球,蓝色球;MyCanvasred,blue;MyFrame){dthisdnewMyCanvasColorredbluenewMyCanvasColorblueredsetLocation0);bluesetLocation100);}ublicvoidrun{while(true){entThread{tdsetLocationxh}nterruptedExceptione}lseifThreadcurrentThread{tbluesetLocationxh}nterruptedExceptione}}}}asextendsCanvas{Colorc;MyCanvas(Colorc){}publicvoidpaint(Graphicsg){cfillOval}}、某和某买电影票，售票员只有3五元的钱，电影，某排在某的前面拿一十元的人avaawtlicclassTest{publicstaticvoidmainStringargs[]){yFrame}}eextendsFramestener{售票员王小姐;Thread某,某,某;extButtonstart=newButton("排队买票");MyFrame){readthisadthisadthiswTextAreate