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This article demonstrates how to convert a string that contains a number value to an integer in Java.

This tutorial demonstrates how to use the instanceof keyword in Java to test the object type.

This article teaches you how to use an enum in Java. Code examples help you to understand the enumeration syntax.

This article demonstartes how to compare objects in Java using the equals() method.

This article demonstrates how to generate random numbers in Java. The code examples helps you to understand the details.

This is a detailed description about how to use HashMap in Java. Lot of code examples makes it easy to understand it's behaviour.

This article explains how to use arrays in Java. With the included code examples it is easy to understand arrays behaviour.

Examples and details of Java for loop usage are covered in this article. You can learn every details about how to use for loops in Java.

A Java method is a collection of statements that are grouped together to perform an operation. When you call the System.out.println method, for example, the system actually executes several statements in order to display a message on the console. Now you will learn how to create your own methods with or without return values, invoke a method with or without parameters, overload methods using the same names, and apply method abstraction in the program design.

While you are programming you would want to use some class members independently of any object of that class. Normally a class member is accessed with the help of the object of that class. However, it is possible to create class members that can be used by itself. To create such a member, the keyword static has to precede its declaration. When a class member is declared as static, it can be accessed before any object of that class is created and without reference to any object. Both methods and variable can be declared as static. The best example to understand is our main() which is declared static. Its is static because it must be called before any object exist.

This tutorial starts with basics programming language constructs in Java and then moves on to discuss Object-oriented Programming concepts in Java. This tutorial is made from my University lectures.