java-多线程1

一、创建多线程的方式1--继承Thread类

步骤：1自定义类MyThread继承Thread类 2MyThread里面重写run()方法 3创建对象 4启动线程

 1 package test;
 2 
 3 public class MyThread extends Thread{
 4     @Override
 5     public void run() {
 6         // TODO Auto-generated method stub
 7         //super.run();
 8         for(int i=0;i<100;i++){
 9             System.out.println(getName()+": "+i );
10         }
11     }
12 }

 1 package test;
 2 
 3 public class Test01 {
 4     public static void main(String[] args) {
 5         MyThread mt=new MyThread();
 6         mt.start();
 7         MyThread mt2=new MyThread();
 8         mt2.start();
 9         
10     }
11 }

二、线程基础

1获得线程名称

1 getName()

2设置线程名称

my1.setName("线程1");

3返回当前正在执行的线程的名称

Thread.currentThread().getName();

4线程优先级

1-10，默认是5

获得优先级

my1.getPriority()

设置优先级

my1.setPriority(2);

三、线程控制

1线程睡眠

 1 package test;
 2 
 3 public class Test01 {
 4     public static void main(String[] args) {
 5         MyThread mt=new MyThread();    
 6         MyThread mt2=new MyThread();
 7         MyThread mt3=new MyThread();
 8         
 9         mt.setName("进程1");
10         mt2.setName("进程2");
11         mt3.setName("进程3");
12         
13         mt.start();
14         mt2.start();
15         mt3.start();
16     }
17 }

 1 package test;
 2 import java.util.Date;
 3 public class MyThread extends Thread{
 4     @Override
 5     public void run() {
 6         // TODO Auto-generated method stub
 7         //super.run();
 8         for(int i=0;i<100;i++){
 9             System.out.println(getName()+": "+i +"  " +new Date());
10             //睡眠
11             try {
12                 Thread.sleep(1000);
13             } catch (InterruptedException e) {
14                 // TODO Auto-generated catch block
15                 e.printStackTrace();
16             }
17         }
18     }
19 }

2线程加入

 1 package test;
 2 
 3 public class Test01 {
 4     public static void main(String[] args) {
 5         MyThread mt=new MyThread();    
 6         MyThread mt2=new MyThread();
 7         MyThread mt3=new MyThread();
 8         
 9         mt.setName("进程1");
10         mt2.setName("进程2");
11         mt3.setName("进程3");
12         
13         mt.start();
14         //线程加入    该线程执行完毕，其他线程才能执行
15         try {
16             mt.join();
17         } catch (InterruptedException e) {
18             // TODO Auto-generated catch block
19             e.printStackTrace();
20         }
21         mt2.start();
22         mt3.start();
23     }
24 }

 1 package test;
 2 import java.util.Date;
 3 public class MyThread extends Thread{
 4     @Override
 5     public void run() {
 6         // TODO Auto-generated method stub
 7         //super.run();
 8         for(int i=0;i<100;i++){
 9             System.out.println(getName()+": "+i +"  " +new Date());
10             //睡眠
11             try {
12                 Thread.sleep(100);
13             } catch (InterruptedException e) {
14                 // TODO Auto-generated catch block
15                 e.printStackTrace();
16             }
17         }
18     }
19 }

3线程礼让

 1 package test;
 2 
 3 public class Test01 {
 4     public static void main(String[] args) {
 5         MyThread mt=new MyThread();    
 6         MyThread mt2=new MyThread();
 7         MyThread mt3=new MyThread();
 8         
 9         mt.setName("进程1");
10         mt2.setName("进程2");
11             
12         mt.start();        
13         mt2.start();
14 
15     }
16 }

 1 package test;
 2 import java.util.Date;
 3 public class MyThread extends Thread{
 4     @Override
 5     public void run() {
 6         // TODO Auto-generated method stub
 7         //super.run();
 8         for(int i=0;i<100;i++){
 9             System.out.println(getName()+": "+i +"  " +new Date());
10             //线程礼让
11             Thread.yield();
12         }
13     }
14 }

4守护线程主线程挂了，守护线程都会挂掉

 1 package test;
 2 
 3 import java.util.Date;
 4 
 5 public class MyThread extends Thread {
 6     @Override
 7     public void run() {
 8         // TODO Auto-generated method stub
 9         // super.run();
10         for (int i = 0; i < 20; i++) {
11             System.out.println(getName() + ": " + i + "  " + new Date());
12 
13         }
14     }
15 }

 1 package test;
 2 
 3 public class Test01 {
 4     public static void main(String[] args) {
 5         MyThread mt=new MyThread();    
 6         MyThread mt2=new MyThread();
 7         MyThread mt3=new MyThread();
 8         
 9         mt.setName("进程1");
10         mt2.setName("进程2");
11         
12         //设置守护线程
13         mt.setDaemon(true);
14         mt2.setDaemon(true);
15         
16         mt.start();        
17         mt2.start();
18         
19         //改主线程的名字为“刘备”
20         Thread.currentThread().setName("刘备");
21         for(int x=0;x<5;x++){
22             System.out.println(Thread.currentThread().getName()+": "+x);
23         }
24 
25     }
26 }

5进程中断

 1 package test;
 2 
 3 public class Test01 {
 4     public static void main(String[] args) {
 5         MyThread mt = new MyThread();
 6 
 7         mt.start();
 8         //进程中断
 9         //超过3秒不醒，则中断
10         try {
11             Thread.sleep(3000);
12             mt.interrupt();
13         } catch (InterruptedException e) {
14             // TODO Auto-generated catch block
15             e.printStackTrace();
16         }
17 
18     }
19 }

 1 package test;
 2 
 3 import java.util.Date;
 4 
 5 public class MyThread extends Thread {
 6     @Override
 7     public void run() {
 8         System.out.println("开始执行："+new Date());
 9         try {
10             Thread.sleep(10000);
11         } catch (InterruptedException e) {
12             // TODO Auto-generated catch block
13             //e.printStackTrace();
14             System.out.println("线程被终止了");
15         }
16         System.out.println("结束执行："+new Date());
17     }
18 }

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