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1、Java语言程序设计1/81&[编程练习题答案]Java语言程序设计（基础篇）（进阶篇）第13、14、15、24、25、26、28、29、30、31章部分习题答案，奇数题和部分双数题是我自己做的，在此和大家分享(^_^~Chapter13Exercise13.2/13.8/13.11importjavax.swing.*;importjava.awt.*;publicclassExercise13_2extendsJFrame{//CreatetwobuttonsprivateOvalButtonjbtOk=newOvalButton("OK");priva

2、teOvalButtonjbtCancel=newOvalButton("Cancel");/**Defaultconstructor*/publicExercise13_2(){//SetthewindowtitlesetTitle("Exercise13_2");//SetFlowLayoutmanagertoarrangethecomponentsJava语言程序设计2/81//insidetheframegetContentPane().setLayout(newFlowLayout());//AddbuttonstotheframegetConte

3、ntPane().add(jbtOk);getContentPane().add(jbtCancel);}/**Mainmethod*/publicstaticvoidmain(String[]args){Exercise13_2frame=newExercise13_2();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.pack();frame.setVisible(true);}}classOvalButtonextendsJButton{publicOvalButton(){}pu

4、blicOvalButton(Stringtext){super(text);}protectedvoidpaintComponent(Graphicsg){//Drawanovalsuper.paintComponent(g);g.drawOval(5,5,getWidth()-10,getHeight()-10);}/**OverridegetmethodforpreferredSize*/publicDimensiongetPreferredSize(){returnnewDimension(100,50);}/**Overridegetmethodf

5、orminimumSize*/publicDimensiongetMinimumSize(){returnnewDimension(100,50);}}Java语言程序设计3/81importjava.awt.*;importjavax.swing.*;publicclassExercise13_8extendsJFrame{publicstaticvoidmain(String[]args){JFrameframe=newExercise13_8();frame.setSize(300,300);frame.setTitle("Exercise13_8")

6、;frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setVisible(true);}publicExercise13_8(){getContentPane().add(newOctagonPanel());}}classOctagonPanelextendsJPanel{protectedvoidpaintComponent(Graphicsg){super.paintComponent(g);intxCenter=getWidth()/2;intyCenter=getHeight()/

7、2;intradius=(int)(Math.min(getWidth(),getHeight())*0.4);//CreateaPolygonobjectPolygonpolygon=newPolygon();//Addpointstothepolygonpolygon.addPoint(xCenter+radius,yCenter);polygon.addPoint((int)(xCenter+radius*Math.cos(2*Math.PI/8)),(int)(yCenter-radius*Math.sin(2*Math.PI/8)));polygo

8、n.addPoint((int)(xCenter+r