java,线程操作,同步访问共享的可变数据

package com.liang.thread;

import java.util.concurrent.TimeUnit;

public class StopThread {
private static /*volatile*/ boolean stopRequested;

private static synchronized void requestStop(){
stopRequested=true;
}

private static synchronized boolean stopReuqested(){
return stopRequested;
}

public static void main(String[] args) throws InterruptedException {
Thread backgroundThread =new Thread(new Runnable() {
public void run() {
long start=System.currentTimeMillis();
int i=0;
//while(!stopRequested){
while(!stopReuqested()){
i++;
}
long end=System.currentTimeMillis();
System.out.println(end-start);
System.out.println(i);
}
});
backgroundThread.start();
TimeUnit.SECONDS.sleep(1);
//stopRequested=true;
requestStop();
}
}