使用日历在当前时间上加或减小时

import java.util.Calendar;

 
 /*
 来 自*
  时 代 J a v a 公 众 号
 */

public class Main {

 

  public static void main(String[] args) {

    Calendar now = Calendar.getInstance();

 

    System.out.println("Current Date : " + (now.get(Calendar.MONTH) + 1)

                        + "-"

                        + now.get(Calendar.DATE)

                        + "-"

                        + now.get(Calendar.YEAR));

   

    System.out.println("Current time : " + now.get(Calendar.HOUR_OF_DAY)
    /**
     * N o w J a v a . c o m - 时代Java 提 供 
    **/

                      + ":"

                      + now.get(Calendar.MINUTE)

                      + ":"

                      + now.get(Calendar.SECOND));

                     

    //add hours to current date using Calendar.add method

    now.add(Calendar.HOUR,10);

 

    System.out.println("New time after adding 10 hours : "

                      + now.get(Calendar.HOUR_OF_DAY)

                      + ":"

                      + now.get(Calendar.MINUTE)

                      + ":"

                      + now.get(Calendar.SECOND));

 

    System.out.println("New date after adding 10 hours : "

                        + (now.get(Calendar.MONTH) + 1)

                        + "-"

                        + now.get(Calendar.DATE)

                        + "-"

                        + now.get(Calendar.YEAR));

   

    //subtract hours from current date using Calendar.add method

    now = Calendar.getInstance();

    now.a