Someone

package tests;

import java.util.HashSet;

import junit.framework.TestCase;

public class EqualTests extends TestCase {

	public EqualTests(String name) {
		super(name);
	}

	protected void setUp() throws Exception {
		super.setUp();
	}

	protected void tearDown() throws Exception {
		super.tearDown();
	}

	
	public void testHashset() throws Exception {
		someObj[] o1 = {
				new someObj("a"),
				new someObj("bb"),
				new someObj("ccc")
		};
		someObj[] o2 = {
				new someObj("a"),
				new someObj("bb"),
				new someObj("ccc")
		};
		
		HashSet s1 = new HashSet(5);
		for(someObj o : o1)
			s1.add(o);
		
		HashSet s2 = new HashSet(5);
		for(someObj o : o2)
			s2.add(o);
		
		System.out.println(s1);
		System.out.println(s2);
		
		assertTrue(s1.equals(s2));
	}
	
	private class someObj {
		String value;
		public someObj(String s) {
			value = s;
		}
		
		public int hashCode() {
			return value.length();
		}
		
		public boolean equals(someObj o) {
			return this.value.equals(o.value);
		}
		
		public int compareTo(someObj o) {
			return this.value.compareTo(o.value);
		}
		
		public String toString() {
			return value;
		}
	}
}