Use Java's extends keyword to derive a child class from a parent class, invoke parent class constructors and methods, override methods, and more. Topics Spotlight: New Thinking about Cloud Computing ...

When two classes are related through inheritance, the child class must be able to access every accessible field, method, or constructor of its parent class. In Java, we use the reserved word super ...

Sealed classes make Java an even more powerful and expressive language and set the stage for even more sophisticated techniques such as pattern matching, which we'll explore in a subsequent article. A ...

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 should be ...

parent class's method must be able to call the next m in the list. It may be irritating to have a child class's method signature be constrained by a parent class's method signature. Suppose a parent ...