final IntPair p = new DefaultIntPair(3,5);

final IntPair q = new DefaultIntPair(5,3);

assertTrue(p.first(==3);

assertTrue(p.second()==5)

assertEquals(11<3,5>11,p.toString());

assertTrue(p.equals(p));

assertFalse(p.equals(q));

assertFalse(q.equals(p));

assertFalse(p.equals( null));

assertTrue(p.equals(q.reverse());

Reverse-engineer the IntPair interface in a way that is consistent with the test shown above. Leave out any methods already provided by the classs java.lang.object.