Java--用单线程创建倒计时表

方法一:

 1 package C5;
 2 
 3 import java.awt.Color;
 4 import java.awt.Font;
 5 
 6 import javax.swing.JFrame;
 7 import javax.swing.JLabel;
 8 import javax.swing.JOptionPane;
 9 import javax.swing.JPanel;
10 import javax.swing.JTextField;
11 
12 public class CountdownTimer extends Thread {
13     JTextField tf;
14     JLabel l;
15     JFrame fr;
16 
17     public void run() {
18         buildGUI();
19     }
20 
21     void display() {
22         for (int i = 60; i >= 0; i--) {
23             try {
24                 Thread.sleep(1000);
25                 String s = Integer.toString(i);
26 
27                 tf.setText("   " + s + "second to go..");
28 
29             } catch (Exception e) {
30                 System.out.println(e);
31             }
32         }
33         JOptionPane.showMessageDialog(fr, "Time up !!!!!!!!");
34         tf.setText("");
35         tf.setEditable(false);
36     }
37 
38     public void buildGUI() {
39         fr = new JFrame("Countown Timer");
40         JPanel p = new JPanel();
41         l = new JLabel("");
42         tf = new JTextField(15);
43 
44         tf.setEnabled(false);
45         Font f = new Font("Verdana", 0, 18);
46         tf.setFont(f);
47         tf.setBackground(Color.black);
48         p.setBackground(Color.blue);
49         fr.add(p);
50         p.add(tf);
51         p.add(l);
52         fr.setVisible(true);
53         fr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
54         fr.setSize(300, 100);
55         fr.setResizable(false);
56         display();
57 
58     }
59 
60     public static void main(String args[]) {
61         CountdownTimer obj = new CountdownTimer();
62         // Thread countthread =new Thread();
63         obj.start();
64     }
65 
66 }

继承thread类

方法二:

 1 package C5;
 2 
 3 import java.awt.Color;
 4 import java.awt.Font;
 5 
 6 import javax.swing.JFrame;
 7 import javax.swing.JLabel;
 8 import javax.swing.JOptionPane;
 9 import javax.swing.JPanel;
10 import javax.swing.JTextField;
11 
12 public class CountdownTimer implements Runnable {
13     JTextField tf;
14     JLabel l;
15     JFrame fr;
16 
17     public void run() {
18         buildGUI();
19     }
20 
21     void display() {
22         for (int i = 60; i >= 0; i--) {
23             try {
24                 Thread.sleep(1000);
25                 String s = Integer.toString(i);
26 
27                 tf.setText("   " + s + "second to go..");
28 
29             } catch (Exception e) {
30                 System.out.println(e);
31             }
32         }
33         JOptionPane.showMessageDialog(fr, "Time up !!!!!!!!");
34         tf.setText("");
35         tf.setEditable(false);
36     }
37 
38     public void buildGUI() {
39         fr = new JFrame("Countown Timer");
40         JPanel p = new JPanel();
41         l = new JLabel("");
42         tf = new JTextField(15);
43 
44         tf.setEnabled(false);
45         Font f = new Font("Verdana", 0, 18);
46         tf.setFont(f);
47         tf.setBackground(Color.black);
48         p.setBackground(Color.blue);
49         fr.add(p);
50         p.add(tf);
51         p.add(l);
52         fr.setVisible(true);
53         fr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
54         fr.setSize(300, 100);
55         fr.setResizable(false);
56         display();
57 
58     }
59 
60     public static void main(String args[]) {
61         CountdownTimer obj = new CountdownTimer();
62         Thread countthread =new Thread(obj);
63         countthread.start();
64     }
65 
66 }

建立runnable接口

注：两个方法比较：

区别：

在继承thread类中：

 1.

2.

在建立runnable接口中：

1.

2

测试结果相同：