java组件运用案例

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1、组合框运用实例importjava.awt•*；importjava.awt.event.*；importjavax.swing.*；publicclassintBinaryJFrameextendsJFrameimplementsActionListener//操作数利运算结果//算术运算符privateJTextFieldtexts[]；privateJComboBoxcombox；publicIntBinaryJFrame(){super(“十进制算术运算的竖式及二进制显示”)；this.setSize(280,220);this.set

2、Resizable(true)；Dimensiondim=getToolkit().getScreenSize()；//获彳导屏幕分辨率this.setLocation((dim.width-this.getWidth())/2z(dim.height-this.getHeight())/2)；//窗口居中this•setBackground(Color.lightGray)；this.setDefaultCloseOperation(EXIT_ON_CLOSE)；//结束上进无呈intnumber=3；//设置彳了数为3彳J：this・get

3、:Content:Pane().setLayout(newGridLayout(number,1))；texts=newJTextField[number*2]；Objectoperators[]={n+n,for(inti=0；icnumber；i++)JPanelpanel=newJPanel(newF1owLayout(FlowLayout.RIGHT))；this・getContentPane().add(panel)；if(i==l)//组合框,默认combox=newJComboBox(operators)；不可编辑panel•ad

4、d(combox)；}if(i==number-1){JButtonbutton=newJButton(n=n);panel.add(button)；button・eddActionListener(this)；//注刖单击事件监0T器卑}texts[i]=newJTextField("0"z5)；texts[i]•setHorizontalAlignment(Swingconstants•RIGHT)；//.文本彳亍彳i对齐panel•add(texts[i])；texts[i+number]=newJTextField(n0n,8)；tex

5、ts[i+number].setHorizontalAlignment(Swingconstants.RIGHT)；texts[i+number].setEditable(false)；panel•add(texts[i+number])；}texts[number-1].setEditable(false)；//只能显示，不允许编辑this.setVisible(true)；}publicvoidactionPerformed(ActionEvente)//按钮单击事件处理方法{try{intx=Integer.parselnt(texts[

6、0].getText(),10)；Stringa=Integer.toBinaryString(x)；inty=Integer.parselnt(texts[1].getText(),10)；Stringb=Integer・toBinA：rySt:ring(y)；texts[3].setText(a)；texts[4]•setText(b);switch(combox.getSelectedlndex()){case0:x+=y；break；case1:x-=y；break；}texts[2].setText(x+"")；texts[5].se

7、tText(Integer•toString(x,2))；}catch(NumberFormatExceptionnfe){JOptionPane.showMessageDialog(this,符串不能转换成整数，请重新输入!");}finally{}}publicstaticvoidmain(Stringarg[]){newlntBinaryJFrame()；}}计算器运用实例importjava>awt•*;importjavax.swing.*;importjava.awt•event•*;publicclassjisuanqiexten

8、dsJFrameimplementsActionListener{privateJTextFieldtext_math;privateJPanelto