Runnable和Thread

1、Runnable是一个接口，当实现该接口时需要复用run方法，在run方法中实现自己的逻辑。

2、Thread是一个类，它其实实现了Runnable方法，也就是说当你通过new 一个Thread得到一个线程实例时，其实就是重写runnable里面的run方法。当你通过实现runnable创建一个线程实例时，你需要将runnable实例传递一个thread，然后通过.start开启线程。

3、Runnable可以线程同步，但是Thread不可以线程同步，例如一共有10张票，你可以开启3个线程同时卖票，如果你通过继承thread创建一个卖票的类，实例化3个线程会各自卖10张票，一共就卖出了30张，当时你通过实现runnable所创建的卖票类，只需要实例化一个对象，将一个对象传递给三个thread，然后开启三个线程，你会发现三个线程一共只会卖10张。

4、以下是卖票的代码

package com.shine.test;
/**
 * 通过继承thread的卖票类
 * @author ASUS
 *
 */
public class MyThread extends Thread {

    ;
    boolean flag = true;
    public MyThread(String string) {
        this.setName(string);
    }

    @Override
    public void run() {
        while(flag){
            saleTick();
        }
    }

    public void saleTick() {
        ){
            ticks--;

            System.out.println(Thread.currentThread().getName()+":"+ticks);
        }else{
            flag = false;
        }
    }

}

package com.shine.test;
/**
 * 通过实现Runnable的卖票类
 * @author ASUS
 *
 */
public class MyRunnable implements Runnable {

    ;
    boolean flag = true;
    @Override
    public void run() {
        while(flag){
            saleTick();
        }

    }
    public void saleTick() {
        ){
            ticks--;
            System.out.println(Thread.currentThread().getName()+":"+ticks);
        }else{
            flag = false;
        }
    }
}

package com.shine.test;

public class Test {

    /**测试
     * @param args
     */
    public static void main(String[] args) {
        MyThread myThread1 = new MyThread("thread1");
        MyThread myThread2 = new MyThread("thread2");
        MyThread myThread3 = new MyThread("thread3");
        myThread1.start();
        myThread2.start();
        myThread3.start();

        MyRunnable myRunnable = new MyRunnable();
        Thread runnable1 = new Thread(myRunnable);
        Thread runnable2 = new Thread(myRunnable);
        Thread runnable3 = new Thread(myRunnable);
        runnable1.setName("runnable1");
        runnable2.setName("runnable2");
        runnable3.setName("runnable3");
        runnable1.start();
        runnable2.start();
        runnable3.start();

    }

}

结果：thread1:
thread1:
thread1:
thread1:
thread1:
thread1:
thread1:
thread1:
thread1:
thread1:
thread2:
thread2:
thread2:
thread2:
thread2:
thread2:
thread2:
thread2:
thread2:
thread2:
thread3:
runnable1:
runnable1:
runnable1:
runnable1:
runnable1:
runnable1:
runnable1:
runnable1:
runnable1:
runnable1:
thread3:
thread3:
thread3:
thread3:
thread3:
thread3:
thread3:
thread3:
thread3:

由于系统自身的线程选择问题 全部由runnable1完成了卖票 但总共只卖出了10张 thread的则卖出了30张