### Question:
BooleanBuilder implements Predicate, Cloneable { @Override public int hashCode() { return predicate != null ? predicate.hashCode() : 0; } BooleanBuilder();  BooleanBuilder(Predicate initial); @Override R accept(Visitor<R,C> v, C context); BooleanBuilder and(@Nullable Predicate right); BooleanBuilder andAnyOf(Predicate... args); BooleanBuilder andNot(Predicate right); @Override BooleanBuilder clone(); @Override boolean equals(Object o); @Nullable Predicate getValue(); @Override int hashCode(); boolean hasValue(); @Override BooleanBuilder not(); BooleanBuilder or(@Nullable Predicate right); BooleanBuilder orAllOf(Predicate... args); BooleanBuilder orNot(Predicate right); @Override Class<? extends Boolean> getType(); @Override String toString();  }### Answer:
@Test public void hashCode_() { assertEquals(new BooleanBuilder(first).hashCode(), new BooleanBuilder(first).hashCode()); assertEquals(new BooleanBuilder().hashCode(), new BooleanBuilder().hashCode()); }