Introduction to Java

We have already learned a few computer-programming languages, like Logo, C++, and Visual Basic. Java is also a very popular computer programming language. Like Visual Basic, it is an object-oriented language. It originated from the programming language, Oak. Oak had some limitations and hence, was modified, giving rise to a new language, which could run on all the computers, networks and operating systems. This new version of Oak in 1996, was given the name, Java.

Java is used as a language for creating Internet-based applications. It creates small application modules, which can be embedded into web pages. These modules are called Applets, which make it possible for a user to interact with the web pages. It has a coding syntax very much similar to C++.


  1. Java is an object-oriented programming language providing features such as inheritance, polymorphism, and abstraction.
  2. Java programs can access data from local machines as well as the web. Java is easy to write, read and use.
  3. Java programs can be executed on any platform that has a Java-enabled Internet browser.
  4. Java supports the ability of an application to perform multiple tasks at the same time. This ability is also termed as multithreading.


Object-oriented programming is one of the most effective ways of programming in computers. It eliminates most of the drawbacks of procedure-oriented programming used in basic, C, etc, by incorporating new concepts. It is an of separating the program into a number of objects (self-contained application components that work together to accomplish a task). In object-oriented programming, a problem is not perceived as a sequence of various steps but as a collection of different objects.

What is an Object? Objects are real-world entities or items. They can be either non-living entities, such as a chair, sketch-pen, car or a pair of goggles or living entities, such as fish, flowers, dogs or a human. In other words, an object may represent a person, an employee, an exam or a geometry box.

Let us understand some more terms related to object-oriented programming (OOP)

CLASS: A class is a collection of similar objects. It represents a group of objects of the same kind. For example, Motor Vehicles. A scooter, bike, bus, and truck fall under the category of motor vehicles. They all belong to the same class.

ENCAPSULATION: The wrapping up of data and ├╝mctions in an object or class is called Encapsulation.

DATA HIDING: By data hiding, it is made inaccessible for other functions outside the objects.

DATA ABSTRACTION: The act of showing essential features of the objects without giving details is termed as, Data abstraction.

INHERITANCE: An object of one class can inherit the properties of another class by a process called inheritance.