Java--多线程处理

Posted 2020-11-06 Catherine_zhilin

示例代码：

多线程，并设置优先级：

 1 package signal;
 2 
 3 
 4 class A  extends Thread{
 5     public void run(){
 6         for(int i=1;i<=3;i++){
 7             System.out.println("a" +i);
 8         }
 9     }
10 }
11 class B  extends Thread{
12     public void run(){
13         for(int i=1;i<=3;i++){
14             System.out.println("b" +i);
15         }
16     }
17 }
18 
19 class     C  extends Thread{
20     public void run(){
21         for(int i=1;i<=3;i++){
22             System.out.println("c" +i);
23         }
24     }
25 }
26 
27 public class first {
28     public static void main (String args[]){
29         A a =new A();
30         B b =new B();
31         C c =new C();
32         
33         a.setPriority(Thread.MAX_PRIORITY);
34         b.setPriority(Thread.NORM_PRIORITY);
35         c.setPriority(Thread.MIN_PRIORITY);
36         
37         a.start();
38         b.start ();
39         c.start ();
40 
41     }
42 
43 }

View Code

测试结果：

 

优先级的设置并不是一定会遵循这个优先级，只是按照优先级的概率会大一些。

情景：

利用多线程，控制交通信号灯

设置交通信号灯：

 1 package signal;
 2 
 3 import java.awt.Color;
 4 
 5 import javax.swing.JFrame;
 6 import javax.swing.JLabel;
 7 import javax.swing.JPanel;
 8 
 9 public class signalDemo extends JFrame implements Runnable  {
10     JPanel red ,yellow ,green;
11     JLabel time ,show;
12     
13     
14 
15     @Override
16     public void run() {
17         
18         
19     try{
20         while(true){
21             red.setBackground(Color.red);
22             yellow.setBackground(Color.gray);
23             green.setBackground(Color.gray);
24             for(int i=3;i>0;i++){
25                 String s =Integer.toString(i);
26                 show.setText(s+"-stop-");
27                 Thread.sleep(1000);
28             }
29             yellow.setBackground(Color.gray);
30             green.setBackground(Color.green);
31             red.setBackground(Color.gray);
32             for(int i=5;i>0;i--){
33                 String s =Integer.toString(i);
34                 show.setText(s+"-go-");
35                 Thread.sleep(1000);
36             }
37 
38             yellow.setBackground(Color.yellow);
39             green.setBackground(Color.gray);
40             red.setBackground(Color.gray);
41             for(int i=2;i>0;i--){
42                 String s =Integer.toString(i);
43                 show.setText(s+"-get slow-");
44                 Thread.sleep(1000);
45             }
46         }
47     }
48     catch(InterruptedException e){
49         System.out.println(e);
50     }
51     }
52     signalDemo(){
53         this.getContentPane().setBackground(Color.black);
54         this.setSize(100,260);
55         this.setVisible(true);
56         this.setLocationRelativeTo(null);
57         
58         
59         red=new JPanel();
60         red.setBackground(Color.red);
61 
62         green=new JPanel();
63         green.setBackground(Color.green);
64 
65         yellow=new JPanel();
66         yellow.setBackground(Color.yellow);
67         
68         setLayout(null);
69         red.setBounds(40,20,40,40);
70         add(red);
71 
72         green.setBounds(40,70,40,40);
73         add(green);
74 
75         yellow.setBounds(40,120,40,40);
76         add(yellow);
77         
78         time =new JLabel("Time remain ");
79         time.setForeground(Color.white);
80         time.setBounds(20,160,100,40);
81         add(time);
82         show =new JLabel("");
83         show.setBounds(38,178,80,40);
84         show.setForeground(Color.cyan);
85         add(show);
86     }
87     
88     public static void main(String args[]){
89         signalDemo sn=new signalDemo();
90         Thread task=new Thread(sn);
91         task.start();
92         
93     }
94     
95 }

View Code

测试结果：