CurrentQuarter.java

package com.levelup.java.date;

import static org.junit.Assert.assertEquals;

import java.time.LocalDate;
import java.time.temporal.ChronoField;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalQuery;
import java.util.Calendar;

import org.junit.Test;

/**
 * This example will demonstrate getting current
 * quarter in Java.  
 * 
 * @author Justin Musgrove
 * @see <a href='http://www.leveluplunch.com/java/examples/current-quarter/'>Current quarter</a>
 * 
 */
public class CurrentQuarter {

	@Test
	public void current_quarter_with_java() {

		Calendar cal = Calendar.getInstance();
		cal.set(Calendar.MONTH, 3);
		
		int month = cal.get(Calendar.MONTH);
		int quarter = 0;

		// 3, 6, 9, 12
		if (month <= 3) {
			quarter = 1;
		} else if (month <= 6) {
			quarter = 2;
		} else if (month <= 9) {
			quarter = 3;
		} else {
			quarter = 4;
		}
		
		assertEquals(1, quarter);
	}
	
	@Test
	public void current_quarter_with_java8() {
	
		LocalDate date = LocalDate.of(2014, 02, 01);
		
		Integer quarter = date.query(new Quarter());

		assertEquals(new Integer(1), quarter);
	}
	
	/**
	 * Methods returns the proper quarter based on the date passed
	 */
	class Quarter implements TemporalQuery<Integer> {

		@Override
		public Integer queryFrom(TemporalAccessor date) {
			
			int month = date.get(ChronoField.MONTH_OF_YEAR);
			
			if (month <= 3) {
				return new Integer(1);
			} else if (month <= 6) {
				return new Integer(2);
			} else if (month <= 9) {
				return new Integer(3);
			} else {
				return new Integer(4);
			}
		}
	}
	
	
}