### Question:
RecordId implements Serializable { @Override public boolean equals(Object o) { return this.hashCode()==o.hashCode(); } RecordId(PageId pid, int tupleNo); int tupleno(); PageId getPageId(); @Override boolean equals(Object o); @Override int hashCode();  }### Answer:
@Test public void equals() { assertEquals(hrid, hrid2); assertEquals(hrid2, hrid); assertFalse(hrid.equals(hrid3)); assertFalse(hrid3.equals(hrid)); assertFalse(hrid2.equals(hrid4)); assertFalse(hrid4.equals(hrid2)); }