5.22JAVA上机作业

 1 package com.wsy.work;
 2 
 3 import java.awt.GridLayout;
 4 import java.awt.event.ActionEvent;
 5 import java.awt.event.ActionListener;
 6 
 7 import javax.swing.JButton;
 8 import javax.swing.JFrame;
 9 import javax.swing.JPanel;
10 import javax.swing.JTextField;
11 
12 public class Compute {
13     JFrame jf;
14     JPanel jp1;
15     JPanel jp2;
16     JButton[] jbs;
17     JTextField jtf;
18     public Compute()
19     {
20         jf = new JFrame("计算器");
21         jp1 = new JPanel();
22         jp2 = new JPanel();
23         jf.setLayout(new GridLayout(2, 1));
24         jp2.setLayout(new GridLayout(4, 4));
25         jbs = new JButton[16];
26         jtf = new JTextField(25);
27         jp1.add(jtf);
28         jf.add("North",jp1);
29         jbs[0] = new JButton("7");
30         jbs[1] = new JButton("8");
31         jbs[2] = new JButton("9");
32         jbs[3] = new JButton("/");
33         jbs[4] = new JButton("4");
34         jbs[5] = new JButton("5");
35         jbs[6] = new JButton("6");
36         jbs[7] = new JButton("*");
37         jbs[8] = new JButton("1");
38         jbs[9] = new JButton("2");
39         jbs[10] = new JButton("3");
40         jbs[11] = new JButton("-");
41         jbs[12] = new JButton("0");
42         jbs[13] = new JButton(".");
43         jbs[14] = new JButton("=");
44         jbs[15] = new JButton("+");
45         for(int i =0; i<jbs.length; i++)
46         {
47             jbs[i].addActionListener(new ActionListener(){
48 
49                 @Override
50                 public void actionPerformed(ActionEvent arg0) {
51                     JButton jb = (JButton)arg0.getSource();
52                     String s = jb.getText();
53                     jtf.setText(s);
54                 }
55                 
56             });
57             jp2.add(jbs[i]);
58         }
59         jf.add("center", jp2);
60         jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
61         jf.setSize(300, 200);
62         jf.setVisible(true);
63     }
64 
65     public static void main(String[] args) {
66         new Compute();
67     }
68 }

 1 package com.wsy.work;
 2 
 3 import java.awt.Color;
 4 import java.awt.event.ActionEvent;
 5 import java.awt.event.ActionListener;
 6 
 7 import javax.swing.JButton;
 8 import javax.swing.JFrame;
 9 import javax.swing.JPanel;
10 
11 public class ChangeColor {
12     JFrame jf;
13     JPanel[] jps;
14     JButton[] jbs;
15     public ChangeColor()
16     {
17         jf = new JFrame();
18         jps = new JPanel[2];
19         for(int i =0; i<jps.length; i++)
20         {
21             jps[i] = new JPanel();
22         }
23         jbs = new JButton[3];
24         jbs[0] = new JButton("红色");
25         jbs[1] = new JButton("绿色");
26         jbs[2] = new JButton("蓝色");
27         for(int i =0; i<jbs.length; i++)
28         {
29             jps[0].add(jbs[i]);
30         }
31         jf.add("North", jps[0]);
32         jf.add("Center", jps[1]);
33         jbs[0].addActionListener(new ActionListener(){
34             @Override
35             public void actionPerformed(ActionEvent e){
36                 jps[1].setBackground(Color.RED);
37             }});
38         jbs[1].addActionListener(new ActionListener(){
39             @Override
40             public void actionPerformed(ActionEvent e){
41                 jps[1].setBackground(Color.GREEN);
42             }});
43         jbs[2].addActionListener(new ActionListener(){
44             @Override
45             public void actionPerformed(ActionEvent e){
46                 jps[1].setBackground(Color.BLUE);
47             }});
48         jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
49         jf.setSize(300, 200);
50         jf.setVisible(true);
51     }
52     public static void main(String[] args) {
53         new ChangeColor();
54     }
55     
56 }