/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
import java.text.SimpleDateFormat;
import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.temporal.TemporalAdjusters;
import java.util.Calendar;
import java.util.GregorianCalendar;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
 
		Calendar cp1 = GregorianCalendar.getInstance();
		cp1.set(Calendar.DAY_OF_MONTH, 1); //THIS LINE WORKS NOW
		System.out.println (cp1);
		cp1.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
		SimpleDateFormat sdf=new SimpleDateFormat ("dd/MM/yyyy");
		System.out.println(sdf.format (cp1.getTime())); 
	}
}

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