Java学习11（多线程）

Java多线程实现：Thread类与Runnable接口对比

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本文通过两个示例介绍了如何在Java中实现多线程，包括继承Thread类和实现Runnable接口的方法。示例1展示了一个继承Thread类的线程打印1到0的过程，而示例2则通过实现Runnable接口创建了两个并发运行的线程，分别打印各自的编号。这两种方式都是Java中创建线程的常见方法，各有优缺点，适合不同的场景。

多线程：

例程1：使用Thread类实现线程

/**使用Thread类实现线程*/

public class ThreadTest extends Thread{  //指定类继承Thread类
    private int count = 10;
    public void run(){
        while(true){
            System.out.print(count+" ");  //打印count变量
            if(--count == 0){
                System.out.println();
                return;
            }
        }
    }
    public static void main(String[] args){
        new ThreadTest().start();
    }
}

程序运行结果：

10 9 8 7 6 5 4 3 2 1

例程2：

/**使用Runnable接口实现线程*/
/*
   run()方法可以重写
*/

class RunnableDemo implements Runnable{    //定义一个类实现Runnable接口
    private Thread t;    //定义私有成员变量t
    private String threadName;   //定义字符串变量threadName

    RunnableDemo(String name){
        threadName = name;
        System.out.println("Creating "+threadName);
    }

    public void run(){
        System.out.println("Running "+threadName);
        try{
            for(int i = 4;i>0;i--){
                System.out.println("Thread："+threadName+","+i);
                //让线程休眠一会儿
                Thread.sleep(50);
            }
        }catch(InterruptedException e){
            System.out.println("Thread "+threadName+" interrupted.");
        }
        System.out.println("Thread "+threadName+" exiting.");
    }

    public void start(){
        System.out.println("Starting "+threadName);
        if(t==null){
            t=new Thread(this,threadName);
            t.start();
        }
    }
}

public class RunnableTest{
    public static void main(String args[]){
        RunnableDemo R1 = new RunnableDemo("Thread-1");
        R1.start();

        RunnableDemo R2 = new RunnableDemo("Thread-2");
        R2.start();
    }
}

程序运行结果：

Creating Thread-1
Starting Thread-1
Creating Thread-2
Starting Thread-2
Running Thread-1
Thread：Thread-1,4
Running Thread-2
Thread：Thread-2,4
Thread：Thread-1,3
Thread：Thread-2,3
Thread：Thread-1,2
Thread：Thread-2,2
Thread：Thread-1,1
Thread：Thread-2,1
Thread Thread-1 exiting.
Thread Thread-2 exiting.