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1、importjava.awt.*;importjava.awt.event.*;importjavax.swing.*;publicclassMyCounterextendsJFrameimplementsActionListener{staticJButton[]b;JButtonclear;JTextFieldtext;Stringstrop;publicstaticdoublefirstNum,secondNum;publicstaticdoubleresult=0;publicstaticintaa;stat
2、icString[]str={"1","2","3","4","5","6","7","8","9","0",".","+","-","*","/","="};publicMyCounter(){b=newJButton[16];for(inti=0;i<16;i++)b[i]=newJButton(str[i]);clear=newJButton("归零");text=newJTextField(18);text.setEditable(false);this.setLayout(newFlowLayout());
3、this.add(text);JPanel[]p=newJPanel[5];for(inti=0;i<5;i++)p[i]=newJPanel();p[0].add(b[0]);p[0].add(b[1]);p[0].add(b[2]);p[0].add(b[3]);p[1].add(b[4]);p[1].add(b[5]);p[1].add(b[6]);p[1].add(b[7]);p[2].add(b[8]);p[2].add(b[9]);p[2].add(b[10]);p[2].add(b[11]);p[3].
4、add(b[12]);p[3].add(b[13]);p[3].add(b[14]);p[3].add(b[15]);p[4].add(clear);this.add(p[0]);this.add(p[1]);this.add(p[2]);this.add(p[3]);this.add(p[4]);this.setBackground(Color.red);this.setVisible(true);this.setSize(240,280);b[0].addActionListener(this);b[1].add
5、ActionListener(this);b[2].addActionListener(this);b[3].addActionListener(this);b[4].addActionListener(this);b[5].addActionListener(this);b[6].addActionListener(this);b[7].addActionListener(this);b[8].addActionListener(this);b[9].addActionListener(this);b[10].ad
6、dActionListener(this);b[11].addActionListener(this);b[12].addActionListener(this);b[13].addActionListener(this);b[14].addActionListener(this);b[15].addActionListener(this);clear.addActionListener(this);this.addWindowListener(newWindowAdapter(){@Overridepublicvo
7、idwindowClosing(WindowEvente){System.exit(0);}});}publicvoidactionPerformed(ActionEvente){JButtonop=(JButton)e.getSource();for(inti=0;i<=10;i++)if(e.getSource()==b[i])text.setText(text.getText()+str[i]);if(op==clear)text.setText("");if(op==b[11]){aa=1;firstNum=
8、Double.parseDouble(text.getText());text.setText(null);}elseif(op==b[12]){aa=2;firstNum=Double.parseDouble(text.getText());text.setText(null);}elseif(op==b[13]){aa=3;firstNum
