原子類不完全原子性

package com.freeflying.thread.volatil;

import java.util.concurrent.atomic.AtomicLong;
/**
 * 原子類不完全原子性
 * @ClassName: AtomicClassNotSafe  
 * @Description:
 * @author freeflying
 * @date 2018年7月14日
 */
public class AtomicClassNotSafe {
	public static void main(String[] args) {
		try {
			AtomicClassNotSafeEx atomicClassNotSafeEx = new AtomicClassNotSafeEx();
			AtomicClassNotSafeEx1[] array = new AtomicClassNotSafeEx1[5];
			for (int i = 0; i < array.length; i++) {
				array[i] = new AtomicClassNotSafeEx1(atomicClassNotSafeEx);
			}
			for (int i = 0; i < array.length; i++) {
				array[i].start();
			}
			Thread.sleep(1000);
			System.out.println(atomicClassNotSafeEx.atomicLong.get());
		} catch (Exception e) {
		}
	}
}
class AtomicClassNotSafeEx1 extends Thread {
	private AtomicClassNotSafeEx atomicClassNotSafeEx;

	public AtomicClassNotSafeEx1(AtomicClassNotSafeEx atomicClassNotSafeEx) {
		this.atomicClassNotSafeEx = atomicClassNotSafeEx;
	}
	@Override
	public void run() {
		atomicClassNotSafeEx.addNum();
	}
}
class AtomicClassNotSafeEx {
	public static AtomicLong atomicLong = new AtomicLong();
	public void addNum() {
		System.out.println(Thread.currentThread().getName() + "after add 10,its value is" + atomicLong.addAndGet(10L));
		atomicLong.addAndGet(1);
	}
}

結果：

Thread-1after add 10,its value is20
Thread-3after add 10,its value is40
Thread-4after add 10,its value is52
Thread-2after add 10,its value is30
Thread-0after add 10,its value is10
55

結論：原子類的單個添加或者減少的方法是具有原子性的，但是方法與方法之間的調用卻不具有原子性。