Single inheritance and multiple inheritance How to use the extends keyword in Java Understanding Java class hierarchy ... less specific “parent” categories (higher up). The example in Figure ...

Now let’s try the same example using composition: import java.util.HashSet ... get a ClassCastException. In inheritance, we can assign the child class to the parent class without casting ...

If another developer attempts to extend your parent class and introduce a new object type, a once exhaustive evaluation becomes incomplete and ineffective. Java ... of inheritance control previously ...

Twenty-three years ago, in his Design Principles and Design Patterns article, Robert "Uncle Bob" Martin boiled down the Liskov substitution principle to the idea that "derived classes ... like a ...