package com.stono.thread2;import java.util.concurrent.atomic.AtomicInteger;public class Page11 extends Thread{    private int count = 5;    private AtomicInteger c2 = new AtomicInteger(5);    @Override    public void run() {        super.run();        // 此处会出现非线程安全问题        count --;        System.out.println("由 "+this.currentThread().getName()+" 计算， count= "+count);        // 这个线程安全        c2.decrementAndGet();        System.out.println("由 "+this.currentThread().getName()+" 计算， AtomicInteger= "+c2.get());    }    public static void main(String[] args) {        Page11 page11 = new Page11();        Thread a = new Thread(page11, "A");        Thread b = new Thread(page11, "B");        Thread c = new Thread(page11, "C");        Thread d = new Thread(page11, "D");        Thread e = new Thread(page11, "E");        a.start();        b.start();        c.start();        d.start();        e.start();            }}