1.2.3实例变量与线程安全（不共享数据的情况）

package demo;/** * Created by sunyifeng on 17/10/9. */public class MyThread extends Thread {    private int count = 5;    public MyThread(String name) {        super();        this.setName(name);    }    @Override    public void run(){        super.run();        while (count > 0) {            count--;            System.out.println("由" + this.currentThread().getName() + "计算，count=" + count);        }    }}

package demo;/** * Created by sunyifeng on 17/10/9. */public class Run {    public static void main(String[] args) {        MyThread a = new MyThread("A");        MyThread b = new MyThread("B");        MyThread c = new MyThread("C");        //        a.start();        b.start();        c.start();    }}

运行结果：

由A计算，count=4
由B计算，count=4
由C计算，count=4
由C计算，count=3
由B计算，count=3
由B计算，count=2
由B计算，count=1
由B计算，count=0
由A计算，count=3
由C计算，count=2
由A计算，count=2
由C计算，count=1
由C计算，count=0
由A计算，count=1
由A计算，count=0