calculating time

package Content;

import java.util.*;

public class CalculateTime {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        long begin = System.currentTimeMillis();
        //
        long end = System.currentTimeMillis();
        double Time = (end-begin)/1000;
        System.out.println("执行时间："+Time);
    }

}