Java编程实践

1、Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践运算结果BackScreen , ForeScreen=Java编程实践Java编程实践Java编程实践Java编程实践Java编程实践/第2排按钮 b7 = new

2、Button(7); b7.setBounds(5,55,20,20); b7 add(b7); b8 = new Button(8); b8.setBounds(30,55,20,20); b8 add(b8); b9 = new Button(9); b9.setBounds(55,55,20,20); add(b9); /第3排按钮 b4 = new Button(4); b4.setBounds(5,80,20,20); add(b4); b5 = new Button(5); b5.setBounds(30,80,20,20); add(b5); b6 = new Button(6)

3、; b6.setBounds(55,80,20,20); add(b6); bPlus = new Button(+); bPlus.setBounds(80,55,20,45); bPlus.setBackground(Color.green); add(bPlus);b9.addActionListener(this);b4.addActionListener(this);b5.addActionListener(this);b6.addActionListener(this);bPlus.addActionListener(this);/第4排按钮 b1 = new Button(1);

4、 b1.setBounds(5,105,20,20); add(b1); b2 = new Button(2); b2.setBounds(30,105,20,20); add(b2); b3 = new Button(3); b3.setBounds(55,105,20,20); add(b3); /第5排按钮 b0 = new Button(0); b0.setBounds(5,130,45,20); add(b0); bPoint = new Button(.); bPoint.setBounds(55,130,20,20); add(bPoint); bEqual = new Button(=); bEqual.setBounds(80,105,20,45); bEqual.setBackground(Color.green); add(bEqual);b3.addActionListener(this);b0.addActionListener(this);bPoint.addActionListener(this);bEqual.addActionListener(this);