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AtomictyIntegerTest.java
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58 lines (51 loc) · 1.45 KB
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package Thread.Basic;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicInteger;
import org.eclipse.jdt.internal.compiler.ast.ThisReference;
/*
* 用原子类改装之前的AtomictyTest类，可以不用synchronize和volatile来保证执行的正确性
*
* 原子类：诸如AtomicInteger AtomicDouble AtomicReference
*
* Atomic类被设计用来构建java.util.concurrent包中的类，只有在特殊情况下才在自己的类中使用它，通常依赖锁来解决（synchronize，Lock）
*
* */
public class AtomictyIntegerTest implements Runnable{
private AtomicInteger i=new AtomicInteger(0);
public int getValue(){
return i.get();
}
public void increment(){
i.addAndGet(2);
}
@Override
public void run() {
while(true){
increment();
}
}
public static void main(String[] args) {
//程序运行时正确的，用一个定时任务来控制5秒后停止
new Timer().schedule(new TimerTask() {
@Override
public void run() {
System.err.println("Aborting");
System.exit(0);
}
}, 5000);
ExecutorService executorService=Executors.newCachedThreadPool();
AtomictyIntegerTest test=new AtomictyIntegerTest();
executorService.execute(test);
while(true){
int val=test.getValue();
System.out.println(val);
if(val%2!=0){
System.out.println(val);
System.exit(0);
}
}
}
}