Object oriented programming in java tutorial in pdf

You all must have this kind of questions in your mind. Below article will solve this puzzle of yours. Just take a look.

Kindly share this post with your friends to make this exclusive release more useful. Written for programmers familiar with Java, this guide explains the principles of object-oriented programming, and how to translate object-oriented designs into real programs using Java and the unified modeling language UML.

The constructor method having the argument list or parameter list is called as parameterized constructor as it initializes the fields with the values of the parameters. A copy constructor is that constructor which use existing object to create a new object.

It copy variables from another object of the same class to create a new object. A static constructor is automatically called when the first instance is generated, or any static member is referenced. The static constructor is explicitly declared by using a static keyword. However, the static constructor is not supported in Java. Java enables us to declare a constructor as private.

We can declare a constructor private by using the private access specifier. Note that if a constructor is declared private, we cannot create an object of the class. Instead, we can use this private constructor in Singleton Design Pattern. Destructor is a type of member function which is used to destroy an object.

It is called automatically when the object goes out of scope or is explicitly destroyed by a call to delete. It destroy the objects when they are no longer in use.

The constructor method of the class may or may not have the argument list, and it has no return type specified and we also know that method overloading depends only on the argument list and not on the return type. Thus, we can say that the constructor method can be overloaded. I hope that after reading this article, your OOPs concept in Java has been quite clear.

If you want to have a deep knowledge of Java Programming through Books, you can download the Beginners Java Programming Books in the PDF version for absolutely free by clicking on the below button. Save my name, email, and website in this browser for the next time I comment. You can download the PDF given at the end of the Article. What is OOPs?

What are the basic features of OOPs? Why use OOPs? What is a class? What is an object? What is the difference between a class and an object? What is the difference between a class and a structure? What is encapsulation? What are access specifiers? What is the difference between public, private and protected access modifiers?

What is data abstraction? How to achieve data abstraction? What is an abstract class? What is an interface? Differentiate between data abstraction and encapsulation. Can we create an instance of an abstract class? What is inheritance? Why we use inheritance? What is superclass?

What is a subclass? What are the types of inheritance? What is single inheritance? What is multilevel inheritance? What is multiple inheritance? What is hierarchical inheritance? What is hybrid inheritance?

What is the difference between multiple and multilevel inheritance? What are the limitations of inheritance? What is polymorphism? What are the types of polymorphism? What is compile time polymorphism? What is runtime polymorphism?

What is method overloading? The Singleton's purpose is to control object creation, limiting the number of objects to only one. Since there is only one Singleton instance, any instance fields of a Singleton will occur only once per class, just like static fields.

Singletons often control access to resources, such as database connections or sockets. For example, if you have a license for only one connection for your database or your JDBC driver has trouble with multithreading, the Singleton makes sure that only one connection is made or that only one thread can access the connection at a time. Example 1 The easiest implementation consists of a private constructor and a field to hold its result, and a static accessor method with a name like getInstance.

The private field can be assigned from within a static initializer block or, more simply, using an initializer. The ClassicSingleton class maintains a static reference to the lone singleton instance and returns that reference from the static getInstance method. Here, ClassicSingleton class employs a technique known as lazy instantiation to create the singleton; as a result, the singleton instance is not created until the getInstance method is called for the first time.

This technique ensures that singleton instances are created only when needed. Creating an Object As mentioned previously, a class provides the blueprints for objects.

So basically, an object is created from a class. In Java, the new keyword is used to create new objects. This call initializes the new object.

Accessing Instance Variables and Methods Instance variables and methods are accessed via created objects. To access an instance variable, following is the fully qualified path:. Source File Declaration Rules As the last part of this section, let's now look into the source file declaration rules. These rules are essential when declaring classes, import statements and package statements in a source file.

If there are no package statements, then the import statement should be the first line in the source file. Classes have several access levels and there are different types of classes; abstract classes, final classes, etc. We will be explaining about all these in the access modifiers chapter. Apart from the above mentioned types of classes, Java also has some special classes called Inner classes and Anonymous classes.

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Did you find this document useful? Is this content inappropriate? Report this Document. Flag for inappropriate content. Download now. Related titles. Carousel Previous Carousel Next. Jump to Page. Search inside document. Java About the Tutorial Java is a high-level programming language originally developed by Sun Microsystems and released in Java — Overview Java Java programming language was originally developed by Sun Microsystems which was initiated by James Gosling and released in as core component of Sun Microsystems' Java platform Java 1.

Java - Environment Setup Java In this chapter, we will discuss on the different aspects of setting up a congenial environment for Java. Java — Basic Syntax Java When we consider a Java program, it can be defined as a collection of objects that communicate via invoking each other's methods. In Java, there are several points to remember about identifiers. With the use of enums it is possible to reduce the number of bugs in your code.

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