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

package test;

public class MyThread extends Thread{
    @Override
    public void run() {
        // TODO Auto-generated method stub
        //super.run();
        for(int i=0;i<100;i++){
            System.out.println(getName()+": "+i );
        }
    }
}

package test;

public class Test01 {
    public static void main(String[] args) {
        MyThread mt=new MyThread();
        mt.start();
        MyThread mt2=new MyThread();
        mt2.start();
        
    }
}

二、线程基础

1获得线程名称

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

package test;

public class Test01 {
    public static void main(String[] args) {
        MyThread mt=new MyThread();    
        MyThread mt2=new MyThread();
        MyThread mt3=new MyThread();
        
        mt.setName("进程1");
        mt2.setName("进程2");
        mt3.setName("进程3");
        
        mt.start();
        mt2.start();
        mt3.start();
    }
}

package test;
import java.util.Date;
public class MyThread extends Thread{
    @Override
    public void run() {
        // TODO Auto-generated method stub
        //super.run();
        for(int i=0;i<100;i++){
            System.out.println(getName()+": "+i +"  " +new Date());
            //睡眠
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

2线程加入

package test;

public class Test01 {
    public static void main(String[] args) {
        MyThread mt=new MyThread();    
        MyThread mt2=new MyThread();
        MyThread mt3=new MyThread();
        
        mt.setName("进程1");
        mt2.setName("进程2");
        mt3.setName("进程3");
        
        mt.start();
        //线程加入    该线程执行完毕，其他线程才能执行
        try {
            mt.join();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        mt2.start();
        mt3.start();
    }
}

package test;
import java.util.Date;
public class MyThread extends Thread{
    @Override
    public void run() {
        // TODO Auto-generated method stub
        //super.run();
        for(int i=0;i<100;i++){
            System.out.println(getName()+": "+i +"  " +new Date());
            //睡眠
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

3线程礼让

package test;

public class Test01 {
    public static void main(String[] args) {
        MyThread mt=new MyThread();    
        MyThread mt2=new MyThread();
        MyThread mt3=new MyThread();
        
        mt.setName("进程1");
        mt2.setName("进程2");
            
        mt.start();        
        mt2.start();

    }
}

package test;
import java.util.Date;
public class MyThread extends Thread{
    @Override
    public void run() {
        // TODO Auto-generated method stub
        //super.run();
        for(int i=0;i<100;i++){
            System.out.println(getName()+": "+i +"  " +new Date());
            //线程礼让
            Thread.yield();
        }
    }
}

4守护线程  主线程挂了，守护线程都会挂掉

package test;

import java.util.Date;

public class MyThread extends Thread {
    @Override
    public void run() {
        // TODO Auto-generated method stub
        // super.run();
        for (int i = 0; i < 20; i++) {
            System.out.println(getName() + ": " + i + "  " + new Date());

        }
    }
}

package test;

public class Test01 {
    public static void main(String[] args) {
        MyThread mt=new MyThread();    
        MyThread mt2=new MyThread();
        MyThread mt3=new MyThread();
        
        mt.setName("进程1");
        mt2.setName("进程2");
        
        //设置守护线程
        mt.setDaemon(true);
        mt2.setDaemon(true);
        
        mt.start();        
        mt2.start();
        
        //改主线程的名字为“刘备”
        Thread.currentThread().setName("刘备");
        for(int x=0;x<5;x++){
            System.out.println(Thread.currentThread().getName()+": "+x);
        }

    }
}

5进程中断

package test;

public class Test01 {
    public static void main(String[] args) {
        MyThread mt = new MyThread();

        mt.start();
        //进程中断
        //超过3秒不醒，则中断
        try {
            Thread.sleep(3000);
            mt.interrupt();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
}

package test;

import java.util.Date;

public class MyThread extends Thread {
    @Override
    public void run() {
        System.out.println("开始执行："+new Date());
        try {
            Thread.sleep(10000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            //e.printStackTrace();
            System.out.println("线程被终止了");
        }
        System.out.println("结束执行："+new Date());
    }
}