When using Java’s Map implementations, it is sometimes common to invoke the Map ‘s get (Object) method and to react differently based on whether the value returned is null or not.

The Java array size is set permanently when the array is initialized. The size or length count of an array in Java includes both null and non-null characters. Unlike the String and ArrayList, Java ...

Classes, fields, methods, constructors, and objects are the building blocks of object-based Java applications. This Java tutorial teaches you how to declare classes, describe attributes via fields ...

This post explains how to call a method in Java. Learn how to define methods, call them from other classes, and pass arguments!

How to use the JOptionPane’s showOptionDialog method Java’s JOptionPane provides a simple way to read input from the user and display information back. The JOptionPane’s list of methods includes many ...