Java Swing简单的加法器

 1 package test; 2 import java.awt.*; 3 import javax.swing.*; 4 import java.awt.event.*; 5 public class FrameDemo2 6 { 7 static JTextField field1=new JTextField(5); 8 static JTextField field2=new JTextField(5); 9 static JTextField field3=new JTextField("0",5);10 11 public FrameDemo2(){12     JFrame f=new JFrame("加法器");13     f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);14     f.setSize(220,100);15     f.setLocation(500,300);16     JLabel jb=new JLabel("+");17     f.setVisible(true);18     JPanel p1=new JPanel();19     f.setContentPane(p1);20     p1.setLayout(new FlowLayout());21 22     p1.add(field1);23     p1.add(jb);24     p1.add(field2);25     p1.add(field3);26     JButton b1=new JButton("计算");27     Color bg=new Color(255,255,255);28     b1.setBackground(bg); 29     p1.add(b1);30 31     b1.addActionListener(new ActionListener()32     {33     public void actionPerformed(ActionEvent e)    //重写actionPerformed方法34     {35     int a,b;36     a=Integer.parseInt(field1.getText()); //获取TextField1中的数据37     b=Integer.parseInt(field2.getText());38     field3.setText(String.valueOf(a+b));39     }40     }41     );42 }43 public static void main(String args[])44 {45     FrameDemo2 fd=new FrameDemo2();46 }47 }