用java编程:创建三个线程,分别显示各自的开始运行时间及总运行时间

public class AThread extends Thread {
private String name;

public AThread(String name) {
this.name = name;
}
public void run() {
long startTime = System.currentMillis();
System.out.println(name + " start at : " + startTime);
Thread.sleep(1000);
System.out.println(name + " totoal cost : " + (System.currentMillis() - startTime));
}
}

public class Test {
public static void main(String[] args) {
for (int i = 0; i < 3; i++) {
AThread t = new AThread("thread " + i);
t.start();
}
}
}