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An overloaded method has a different signature and is in the same class as another method. An overridden method has the same ...

Find out how constructors work when you have subclasses of subclasses.

Creating your first class and instantiating objects from it in Java.

You can have multiple methods with the same name as long as the number and/or types of the parameters is different.

Quick overview of classes, objects, attributes, constructors, and methods.

Learn when to use -- and not to use -- exceptions.

When you pass an object to a method, you are passing a copy of the *reference* to that object. That lets you update an object's ...

Find out the limits of using casting when working with polymorphism.

Composite over inheritance is an OOP design principle we've followed for several years. Like me, you might have seen it in the ...

ArrayLists let you store an arbitrary number of items, unlike Arrays, which have a fixed length. Here are some of the most-used ...

The TimedTestFramework is a Java class that you can extend to implement a doTest() method. Then, you can make an instance of ...

Primitives (int, double, etc.) have values stored in their memory locations. Objects have references to the memory where the data ...

Classes : Part 3 : Operator overloading.

This is an audio version of the Wikipedia Article: https://en.wikipedia.org/wiki/Constructor_(object-oriented_programming) ...

ADSB 05_06.

What if Javascript lost its closure and lexical scope? I added dynamic scoping to a JS engine to explore this question. What if JS ...

You can create properties and methods that are independent of any specific instance of the class, but rather belong to the class as ...

Converting Arrays to ArrayLists, and the remove(), contains(),indexOf(), and lastIndexOf() methods.

Like any other language, Java has the enum feature that allows us to enumerate items. It is helpful to list delimited items in your ...

In Java, you can have a two-dimensional array where each row has a different number of elements. This is called a ragged array.