多线程

含义：程序里同时执行多个任务并加以控制就是多线程的含义。能充分运用cpu内存等硬件设备，提高程序运行效率。

实现方法：继承Thread;实现Runable

package cap1;

public class Eat extends Thread{

    @Override
    public void run() {
        for(int i=0;i<=10;i++){
            try {
                Thread.sleep(1000);
                System.out.println("吃东西");
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    

}
——————————————————————————————————————————
package cap1;

public class Music extends Thread{

    @Override
    public void run() {
    for(int i=0;i<=10;i++){
        try {
            Thread.sleep(1000);
            System.out.println("听音乐");
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    }
    

}
——————————————————————————————————————————
package cap1;

public class mainMethod {
    public static void main(String[] args) {
        Music musicThread=new Music();
        Eat eatMusic=new Eat();
        musicThread.start();
        eatMusic.start();
    }
}

package cap2;

public class Thread1 extends Thread{
    
    private int baozi=1;
    private String threadName;
    
    public Thread1(String threadName){
        super();
        this.threadName=threadName;
    }

    @Override
    public void run() {
    while(baozi<=10){
        System.out.println(threadName+"吃第"+baozi+"个包子");
        baozi++;
    }
    }
    public static void main(String[] args) {
        Thread1 t1=new Thread1("张三线程");
        Thread1 t2=new Thread1("李四线程");
        t1.start();
        t2.start();
    }
    
}

package cap3;

import cap2.Thread1;

public class Thread2 implements Runnable{

    private int baozi=1;
    private String threadName;
    
    public Thread2(String threadName){
        super();
        this.threadName=threadName;
    }

    @Override
    public void run() {
    while(baozi<=10){
        System.out.println(threadName+"吃第"+baozi+"个包子");
        baozi++;
    }
    }
    public static void main(String[] args) {
        Thread1 t1=new Thread1("张三线程");
        Thread1 t2=new Thread1("李四线程");
        
        Thread t11=new Thread(t1);
        Thread t12=new Thread(t2);
        t11.start();
        t12.start();
    }
    
}

package cap3;

import cap2.Thread1;
/*
 * runable可以实现数据共享，一个人干三个人的事情
 */

public class Thread3 implements Runnable{

    private int baozi=1;
    private String threadName;
    
    public Thread3(String threadName){
        super();
        this.threadName=threadName;
    }

    @Override
    public synchronized void run() {
    while(baozi<=10){
        System.out.println(threadName+"吃第"+baozi+"个包子");
        baozi++;
    }
    }
    public static void main(String[] args) {
        Thread3 t1=new Thread3("超级线程");
        
        
        Thread t11=new Thread(t1);
        Thread t12=new Thread(t1);
        Thread t13=new Thread(t1);
        t11.start();
        t12.start();
        t13.start();
    }
    
}