import java.awt.*;
import java.util.*;

/**
 * This example program fails to find the Point on the second call
 * because you're not supposed to mutate a hash collection's element/key
 * after you've added it.  Or, more specifically, the mutation will change
 * its hashCode result, which changes the hash bucket Java looks in to find
 * the value later.
 * @author Marty Stepp
 * @version CSE 331 Spring 2011, 5/25/2011
 */
public class Example1 {
	public static void main(String[] args) {
		Point p = new Point(3, 4);
		Set<Point> set = new HashSet<Point>();
		set.add(p);
		System.out.println(set.contains(new Point(3, 4)));  // true

		p.translate(2, 2);
		System.out.println(set.contains(new Point(5, 6)));  // false

		Point p2 = new Point(5, 6);
		set.add(p2);
	}
}