Introduction to Java

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.

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.

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.

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.

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

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

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

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

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

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

This guides shows how to read text and binary files in Java into String / byte array.

This guide shows how to compress / decompress data using ZIP, and provides an example utility to perform this task.

Accessing files with Java is easy. With this easy to follow tutorial you will learn how to perform basic file operations in Java. Reading, writing, appending, and random file access are covered. Along with an introduction to file locking.

JUnit is a popular testing framework. This simple tutorial shows how to write a JUnit testcase.

This tutorial shows how to make an object serializer tool that saves Java objects to the file system.

A proxy in Java can wrap an object and expose the same interface. This proxy can be used the same way as the original object, but can contain extra functionality. This site shows an example how to make a proxy that logs all method calls of an object.

Learn all aspects of arrays in Java. From the beginner level to advanced. Take a look and become an array guru.

A detailed tutorial for If else which plays a very important role for beginners If else? What are "if elses" and why do you use it? Come and find everything in this tutorial

Java programming language was primarily developed to deal with embedded applications. But with the introduction of Swing and other user interface utilities to Java, it made its mark in desktop applications too. Now the trend is to use Java technology in developing large web and enterprise applications. Java is more focused on web then desktop applications. But, in this article, we are going to discuss how useful Java is as a development technology for stand alone desktop application development in present scenario.