java时间的计算

package con.dragon.cn;

public class TimeCalculation {

static {
    long start = System.currentTimeMillis();//时间开始
    for (int i = 0; i < 10000; i++) {
        System.out.println(i);
    }
    long stop = System.currentTimeMillis();//时间结束
    System.out.println("运行时间为：" + (stop - start)+"s");//计算运行的时间；
}
public static void main(String[] arg) {
     new TimeCalculation();
}

}