@Test public void testIsOne() { assertFalse(zero.isOne()); assertTrue(one.isOne()); assertFalse(zeroZero.isOne()); assertFalse(zeroOne.isOne()); assertFalse(oneZero.isOne()); assertFalse(oneOne.isOne()); }
abstract boolean isOne();
ID { abstract boolean isOne(); }
ID { abstract boolean isOne();  }
ID { abstract boolean isOne();   }
ID { abstract boolean isOne();    }