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TestCompareAndSwap.java
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50 lines (45 loc) · 1.25 KB
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package com.zyj;
/**
* 版权声明：CopyRight (c) 2018 ucarinc. All Rights Reserved.
*
* @author : 张勇杰
* @date : 2019/2/22 9:46
* @Version : v1.0
* @description
**/
public class TestCompareAndSwap {
public static void main(String[] args) {
final CompareAndSwap compareAndSwap=new CompareAndSwap();
for(int i = 0 ;i<5;i++){
new Thread(new Runnable() {
@Override
public void run() {
int expectedValue = compareAndSwap.get();
System.out.println(compareAndSwap.compareAndSet(expectedValue,(int)(Math.random()*101)));
}
}).start();
}
}
}
class CompareAndSwap{
private int value;
public synchronized int get(){
return value;
}
/**
* 比较
* @param expectedValue
* @param newValue
* @return
*/
public synchronized int compareAndSwap(int expectedValue,int newValue){
int oldValue = value;
if(oldValue == expectedValue){
this.value = newValue;
}
return oldValue;
}
public synchronized boolean compareAndSet(int expectedValue,int newValue){
return expectedValue == compareAndSwap(expectedValue,newValue);
}
}