随笔——测量程序运行时间

import java.util.*;

public class DiffDemo {
    
    
 
   public static void main(String args[]) {
    
    
      try {
    
    
         long start = System.currentTimeMillis( );
        //程序
         long end = System.currentTimeMillis( );
         long diff = end - start;
         System.out.println("Difference is : " + diff);
      } catch (Exception e) {
    
    
         System.out.println("Got an exception!");
      }
   }
}