The first half of this introduction to Java inheritance teaches you how to use the extends keyword to derive a child class from a parent class, invoke parent class constructors and methods ...

I once attended a Java user group meeting where James Gosling ... but rather implementation inheritance (the extends relationship). Interface inheritance (the implements relationship) is preferable.

Java's open inheritance model can feel like an open invitation to unintended extensions. The problem becomes especially poignant when a switch statement or a nesting of if statements assumes that a ...