19. Overriding the equals method is necessary if you want to test equivalence in standard library classes (for example, ensuring a java.util.Set contains unique elements or using objects as keys in java.util.Map objects). Note, if you override equals, ensure you honour the API contract as described in the documentation.
A workable approach to handle that situation may be to have the base type implement an equals2 method, which return 1 if its special knowledge of the other object meant it could tell it was equal, -1 if it could tell it was not equal, or 0 if it couldn't tell. If either type's equals2 method knows they're unequal, they're unequal. Otherwise, ifThe equals method in Java serves a specific purpose: it determines if the objects are logically equal, i.e. their content is the same, whatever that may mean in the context of each specific class. This is in contrast to the objects being the same: two different objects could be logically equivalent. Going back to your example, a and b are
Change the "equals" method parameter type to "Object" not String. Add the "hashCode" method - hashCode should be overridden any time you overide equals (see "Effective Java", Item 9. The equals method should have the following attributes (see "Effective Java", Item 8) o1.equals (null) == false.4 days ago · We didn’t override the equals() method in the classes. The default implementation given in the Object class will therefore be executed when determining equality. To put it differently, Java checks whether two references point to the same object when checking for equality. 3. Using AssertJ5GP6mA.