Every Java class inherits from Object, so familiarity with this superclass is fundamental to understanding the Java class hierarchy. Also see my Java tip introducing composition vs. inheritance .

Imagine you are an expert object-oriented Java developer who meticulously crafts code the way an artist cares for their masterpiece. You believe clean code is an absolute necessity. Classes with clear ...

Polymorphism and Java inheritance. ... We use polymorphism all the time in the core Java classes. One very simple example is when we instantiate the ArrayList class declaring the List interface as ...