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1、packagecom.niit.calculator;importjava.awt.BorderLayout;importjava.awt.Color;importjava.awt.GridBagLayout;importjava.awt.GridLayout;importjava.awt.event.ActionEvent;importjava.awt.event.ActionListener;importjava.awt.event.ItemEvent;importjava.awt.event.ItemListener;importjava.awt.event.MouseEvent
2、;importjava.awt.event.MouseListener;importjavax.swing.JButton;importjavax.swing.JFrame;importjavax.swing.JLabel;importjavax.swing.JOptionPane;importjavax.swing.JPanel;importjavax.swing.JTextField;publicclassCalculatorextendsJFrame{Stringstr1="";Stringstr2="";Stringstr3="";doubleresult=0;doublenu
3、mber=0;intcount=0;privateJPanelpnl1;privateJPanelpnl2;privateJPanelpnl3;privateJPanelpnl4;//文本框privateJTextFieldtxt;//按钮privateJButtonbtnBackspace;privateJButtonbtnC;privateJButtonbtnCe;privateJButton[]btn;privateString[]s;publicCalculator(){this.setLayout(newBorderLayout());this.setTitle("计算器")
4、;this.setBounds(100,100,350,300);this.setResizable(false);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//初始化组件initcomponent();}/***初始化组件*/publicvoidinitcomponent(){//初始化pnlpnl1=newJPanel();pnl2=newJPanel();pnl3=newJPanel();pnl4=newJPanel();//上面this.add(pnl1,BorderLayout.NORTH);txt=newJTex
5、tField();txt.setHorizontalAlignment(JLabel.RIGHT);txt.setColumns(30);pnl1.add(txt);//中间this.add(pnl2,BorderLayout.CENTER);pnl2.setLayout(newBorderLayout());pnl2.add(pnl3,BorderLayout.NORTH);btnBackspace=newJButton("Backspace");btnBackspace.setForeground(Color.red);btnC=newJButton("C");btnC.setFo
6、reground(Color.red);btnCe=newJButton("CE");btnCe.setForeground(Color.red);pnl3.add(btnBackspace);pnl3.add(btnC);pnl3.add(btnCe);//下面pnl2.add(pnl4,BorderLayout.CENTER);pnl4.setLayout(newGridLayout(4,6));btn=newJButton[24];s=newString[]{"MC","7","8","9","/","sqrt","MR","4","5","6","*","%","MS","1"
7、,"2","3","-","1/x","M+","0","+/-",".","+","="};for(inti=0;i<24;i++){btn[i]=newJButton(s[i]);pnl4.add(btn[i]);//按钮绑定点击监听器btn[i].addActionListener(newbtnListener());}btnC.addActionListener(newbtnListener());btnBackspace.addAct
