Probando la mutabilidad en un hashmap

PruebaMutable.java

package com.aep.billing.dao.dialect;

import static org.junit.Assert.assertEquals;

import java.util.HashMap;
import java.util.Map;

import org.junit.Test;

/**
 * @author: miuler
 * <p/>
 * date: 20/03/14 time: 10:01 AM
 */
public class PruebaMutable {

	class Point {

		private int x, y;

		public Point(int x, int y) {
			this.x = x;
			this.y = y;
		}

		public Point move(int x, int y) {
			this.x = x;
			this.y = y;
			return this;
		}


		@Override
		public boolean equals(Object o) {
			if (this == o) return true;
			if (o == null || getClass() != o.getClass()) return false;

			Point point = (Point) o;

			if (x != point.x) return false;
			if (y != point.y) return false;

			return true;
		}

		@Override
		public int hashCode() {
			int result = x;
			result = 31 * result + y;
			return result;
		}
	}

	@Test
	public void pruebaInmutable() {

		final Map<Point, String> map = new HashMap<Point, String>();

		Point p1 = new Point(1, 1);
		Point p2 = new Point(2, 2);

		map.put(p1, "p1");
		map.put(p2, "p2");

		assertEquals("p1", map.get(p1));

		p1.move(10, 10);
		assertEquals("p1", map.get(p1));

	}
}