使用日历在当前时间上加或减秒

import java.util.Calendar;

 /** from 时 代 J a v a - N o w J a v a . c o m**/

public class Main {

 

  public static void main(String[] args) {

    Calendar now = Calendar.getInstance();

    System.out.println("Current time : " + now.get(Calendar.HOUR_OF_DAY)

                      + ":"

                      + now.get(Calendar.MINUTE)

                      + ":"

                      + now.get(Calendar.SECOND));

                     

    now.add(Calendar.SECOND,100);
    /**
    来 自 时 代 J a v a 公 众 号
    **/

 

    System.out.println("New time after adding 100 seconds : "

                      + now.get(Calendar.HOUR_OF_DAY)

                      + ":"

                      + now.get(Calendar.MINUTE)

                      + ":"

                      + now.get(Calendar.SECOND));

 

    //subtract seconds from current time using Calendar.add method

    now = Calendar.getInstance();

    now.add(Calendar.SECOND, -50);

 

    System.out.println("Time before 50 minutes : " + now.g