Java add days to current date

package com.w3schools;
 
import java.util.Calendar;
 
public class CalenderTest {
	public static void main(String args[]){
	   Calendar calendar = Calendar.getInstance();  
	   System.out.println("The current date is : " + calendar.getTime());  
	   calendar.add(Calendar.DATE, 10);  
	   System.out.println("10 days later: " + calendar.getTime());  
	   calendar.add(Calendar.MONTH, 3);  
	   System.out.println("3 months later: " + calendar.getTime());  
	   calendar.add(Calendar.YEAR, 4);  
	   System.out.println("4 years later: " + calendar.getTime()); 
	   int maximum = calendar.getMaximum(Calendar.DAY_OF_WEEK);  
	   System.out.println("Maximum number of days in week: " + maximum);  
	   maximum = calendar.getMaximum(Calendar.WEEK_OF_YEAR);  
	   System.out.println("Maximum number of weeks in year: " + maximum);  
	   int minimum = calendar.getMinimum(Calendar.DAY_OF_WEEK);  
	   System.out.println("Minimum number of days in week: " + minimum);  
	   minimum = calendar.getMinimum(Calendar.WEEK_OF_YEAR);  
	   System.out.println("Minimum number of weeks in year: " + minimum);  
	}
}

The current date is : Mon Apr 09 23:33:23 IST 2018
10 days later: Thu Apr 19 23:33:23 IST 2018
3 months later: Thu Jul 19 23:33:23 IST 2018
4 years later: Tue Jul 19 23:33:23 IST 2022
Maximum number of days in week: 7
Maximum number of weeks in year: 53
Minimum number of days in week: 1
Minimum number of weeks in year: 1