1. 自反性. reflexive . for non null value. x.equals(x) always be true.
2. 对称性. symmetric. for non null value x and y. if x.equals(y) = true, y.equals(x) always will be true.
3. Transitive. transitive. x,y,z
4. Consistency.
1. 自反性. reflexive . for non null value. x.equals(x) always be true.
2. 对称性. symmetric. for non null value x and y. if x.equals(y) = true, y.equals(x) always will be true.
3. Transitive. transitive. x,y,z
4. Consistency.