Calendar calculation

import java.util.Calendar;
// j a  v  a  2s .  c o m
public class Main {
  public static void main(String[] args) {
    Calendar now = Calendar.getInstance();
    System.out.println("Current time : ");
    System.out.println(now.get(Calendar.HOUR_OF_DAY) + ":"
        + now.get(Calendar.MINUTE) + ":" + now.get(Calendar.SECOND));

    // Calendar class automatically adjust the date or hour when adding or subtracting minutes
    now.add(Calendar.MINUTE, 200);

    System.out.println("After adding 200 minutes:");
    
    System.out.println(now.get(Calendar.HOUR_OF_DAY) + ":"
        + now.get(Calendar.MINUTE) + ":" + now.get(Calendar.SECOND));

  }
}

import java.util.Calendar;
//from j a  va  2 s  .c  om
public class Main {
  public static void main(String[] args) {

    Calendar now = Calendar.getInstance();
    // add months to current date using Calendar.add method
    now.add(Calendar.MONTH, 1);
    System.out.println("adding one month : ");
    System.out.println((now.get(Calendar.MONTH) + 1));
    // adding minus value
    now = Calendar.getInstance();
    now.add(Calendar.MONTH, -1);
    System.out.println("adding minus value: ");
    System.out.println((now.get(Calendar.MONTH) + 1));
  }
}

import java.util.Calendar;
/*from  ja  v  a  2  s. c o m*/
public class Main {
  public static void main(String[] args) {
    Calendar now = Calendar.getInstance();
    // add seconds to current date
    now.add(Calendar.SECOND, 500);
    System.out.println("adding 500 seconds : ");
    System.out.println(now.get(Calendar.MINUTE) + ":"
        + now.get(Calendar.SECOND));

    // adding minus value
    now = Calendar.getInstance();
    now.add(Calendar.SECOND, -500);
    System.out.println("adding -500 seconds: ");
    System.out.println(now.get(Calendar.MINUTE) + ":"
        + now.get(Calendar.SECOND));
  }
}

import java.util.Calendar;
/*  j a  v a 2 s  . c  om*/
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));

    // add year to current date
    now.add(Calendar.YEAR, 1);
   
    // add minus value
    now = Calendar.getInstance();
    now.add(Calendar.YEAR, -1);
  }
}

import java.util.Calendar;
//from j a  v a 2s. c  o  m
public class Main {
  public static void main(String[] args) {

    Calendar now = Calendar.getInstance();

    // adding 100 months to current date
    now.add(Calendar.MONTH, 100);
    System.out.println("adding one hundred month : ");
    System.out.println((now.get(Calendar.MONTH) + 1));
    System.out.println(now.get(Calendar.DATE));
    System.out.println(now.get(Calendar.YEAR));

  }
}