we will help you to understand about Java OOP’S concepts with examples. oops concepts in java
Data Binding Data Hiding Encapsulation Summary: This tutorial "Data Binding Data Hiding Encapsulation "is targeted as a good starting point for those who are new to OOPS concepts. Even if you are familiar with, start reading and you may find something useful that you have not known earlier. Or you can enjoy the approach I …
Composition vs Inheritance After Encapsulation, the second OOPS feature is "Inheritance". In the previous Parrot program, the Parrot created an object of Bird and used Bird's method eat(). Now in inheritance, we call the eat() method with Parrot object itself (and not with Bird object). This is the difference between composition and inheritance. In composition, …
We know earlier, Java does not support multiple inheritance, basically. But to support multiple inheritance, partially, Java introduced "interfaces". An interface is not altogether a new one for us; just it is a special flavor of abstract class where all methods are abstract. That is, an interface contains only abstract methods. Syntax of multiple inheritance …
We know earlier, in method overriding, the subclass method supersedes the super class method. When the method is overridden in inheritance, the subclass object calls its own method. If it calls its own method, the subclass looses the functionality of the super class method (of course, subclass is at liberty). If the subclass would like …
A constructor looks more like a method but without return type. Moreover, the name of the constructor and the class name should be the same. The advantage of constructors over methods is that they are called implicitly whenever an object is created. In case of methods, they must be called explicitly. To create an object, …
Access Specifiers Modifiers are different. Specifier specifies access and modifier modifies access. A very confusing for a Beginner. Expalained Simple terms. Java supports both specifiers and modifiers that can dictate the access. An access specifier can be applied to any identifier like variables, methods and classes but modifiers cannot be applied to every identifier, there …
Java Abstract Class Tutorial Example Summary: By the end of this tutorial "Java Abstract Class Tutorial Example", you will be comfortable to practice abstract methods and abstract classes. abstract Modifier You have seen earlier two access modifiers – static and final. Now let us go for another modifier "abstract". "abstract" modifier (and also keyword) can …
final Keyword Java After going through "static" and "super" keywords, let us go another keyword "final". These three keywords, known as access modifiers, are used very often in Java code. The final keyword behaves very differently when applied to variables, methods and classes. Even though its functionality (purpose) is different in the three contexts, but …
Types of Inheritance There exists basically three types of inheritance. Multilevel inheritance Multiple inheritance Hierarchical inheritance 1. In single inheritance, one class extends one class only. In multilevel inheritance, the ladder of single inheritance increases. 2. In multiple inheritance, one class directly extends more than one class. 3. In hierarchical inheritance one class is extended …
Subclass can make use of super class methods straight away by virtue of inheritnace. If the subclass does not satisfy about the functionality (output) of the super class method, the subclass can rewrite with its own functionality with the same method name. This concept is known as "method overriding", supported by OOP languages like C++/Java. …
this Keyword Java "this" keyword refers an object, to say, the current object. Observe the following program and pay attention to this.salary. public class Officer3 { int salary; public void display(int salary) { this.salary = salary; } public static void main(String args[]) { Officer3 o1 = new Officer3(); o1.display(5000); System.out.println(o1.salary); // 5000 } } In …
Composition has-a Relationship One of the goals of OOP languages is reusability. Java gives good importance for reusability. A method in Java can be called in two ways. With the objects of the same class (through composition) With the objects of other classes (through inheritance) Here we discuss the composition. class Bird { public void …
Using Variables from Methods Summary : In this Java tutorial Using Variables from Methods , you understand how to call instance and local variables from methods. Observe keenly the difference of using variables from methods. An object is required to call instance variables but not local. You know, C/C++ global variables in Java are called …
Java Methods Method Overloading Using Methods The procedures and functions are known as methods in Java. The methods scope is for the whole class. Now here, you can make a small difference. A function in C-lang can be called without object but a method is to be called with an object. The first line of …
Java Local Instance Variables Summary: Explained in Java syntax in a simple way of using "Java Local Instance Variables" for a beginner. Variables – Properties A program stores values in variables. As the name indicates, a variable value can be varied by the programmer at any time. An object uses variables to set its properties. …
Java Example Compilation Execution Summary: By the end of this tutorial, you will understand how a "Java Example Compilation Execution" is done. What is a class in Java? Two concepts existed in the minds of Java designers from the day one of development – to make the language simple and easy to practice and platform-independent. …
OOPS concepts Tutorial Summary: By the end of this tutorial "OOPS concepts Tutorial", you will understand the meaning of OOPS concepts. Three basic concepts of OOPS Abstraction Encapsulation Polymorphism 1. Abstraction Abstraction means using the equipment (or code) without knowing the details of working. For example, you are using your mobile phone without knowing how …
