JAVA测量时间

下面的一个例子表明如何测量时间间隔（以毫秒为单位）：

import java.util.*;
  
public class DiffDemo {
 
   public static void main(String args[]) {
      try {
         long start = System.currentTimeMillis( );
         System.out.println(new Date( ) + "\n");
         Thread.sleep(5*60*10);
         System.out.println(new Date( ) + "\n");
         long end = System.currentTimeMillis( );
         long diff = end - start;
         System.out.println("Difference is : " + diff);
      } catch (Exception e) {
         System.out.println("Got an exception!");
      }
   }
}

以上实例编译运行结果如下:

Fri Jan 08 09:48:47 CST 2016

Fri Jan 08 09:48:50 CST 2016

Difference is : 3019