{"id":244509,"date":"2021-06-05T09:33:12","date_gmt":"2021-06-05T09:33:12","guid":{"rendered":"https:\/\/imarticus.org\/?p=244509"},"modified":"2024-04-02T07:43:51","modified_gmt":"2024-04-02T07:43:51","slug":"object-oriented-features-of-java","status":"publish","type":"post","link":"https:\/\/imarticus.org\/blog\/object-oriented-features-of-java\/","title":{"rendered":"Complete Guide: Object Oriented Features of Java!"},"content":{"rendered":"

What is OOPs?<\/h2>\n

OOPs, the concept brings this data\u00a0<\/strong>and\u00a0behavior\u00a0<\/strong>in a single place called\u00a0\u201cclass\u201d<\/strong>\u00a0and we can\u00a0create any number of objects<\/strong> to represent the different states for each object.<\/p>\n

Object-oriented programming training<\/a><\/strong> (OOPs) is a programming paradigm based on the concept of \u201cobjects\u201d that contain data and methods. The primary purpose of object-oriented programming is to increase the flexibility and maintainability of programs.<\/p>\n

Object-oriented programming brings together data and its behavior (methods) in a single location(object) makes it easier to understand how a program works. We will cover each and every feature of OOPs in detail so that you won\u2019t face any difficultly understanding OOPs Concepts.<\/strong><\/p>\n

Object-Oriented Features in Java<\/strong><\/figcaption><\/figure>\n

<\/h2>\n
    \n
  1. Classes<\/li>\n
  2. Objects<\/li>\n
  3. Data Abstraction<\/li>\n
  4. Encapsulation<\/li>\n
  5. Inheritance<\/li>\n
  6. Polymorphism<\/li>\n<\/ol>\n

    What is Class?<\/h2>\n

    The class represents a real-world entity that acts as a blueprint for all the objects.<\/p>\n

    We can create as many objects as we need using Class.<\/p>\n

    Example:
    \nWe create a class for \u201c Student \u201d entity as below<\/p>\n

    Student.java<\/p>\n

    Class Student{
    \nString id;
    \nint age;
    \nString course;
    \nvoid enroll(){
    \nSystem.out.println(\u201cStudent enrolled\u201d);
    \n}
    \n}<\/p>\n

    The above definition of the class contains 3 fields id, age, and course, and also it contains behavior or a method called \u201c enroll \u201d.<\/p>\n

    What is an Object?<\/h2>\n

    Object-Oriented Programming System(OOPS) is designed based on the concept of \u201cObject\u201d.\u00a0<\/strong>It\u00a0contains both\u00a0variables<\/strong>\u00a0(used for holding the data) and\u00a0methods<\/strong>(used for defining the behaviors).<\/p>\n

    We can\u00a0create any number of objects<\/strong>\u00a0using this class and all those objects will get the same fields and behavior.<\/p>\n

    \n
    \n
    Student s1\u00a0=<\/span>\u00a0new<\/span>\u00a0Student(<\/span>)<\/span>;<\/span><\/div>\n<\/div>\n<\/div>\n

    Now we have created 3 objects\u00a0s1,s2,<\/strong>\u00a0and\u00a0s3\u00a0<\/strong>for the same class\u00a0\u201c Student \u201d<\/strong>.We can create as many objects as required in the same way.<\/p>\n

    We can set the value for each field of an object as below,<\/p>\n

    \n
    \n
    s1.id<\/span>=<\/span>123<\/span>;<\/span><\/div>\n
    s2.age<\/span>=<\/span>18<\/span>;<\/span><\/div>\n
    s3.course<\/span>=<\/span>\u201dcomputers\u201d;<\/span><\/div>\n<\/div>\n<\/div>\n
    <\/div>\n

    What is Abstraction?<\/h2>\n

    Abstraction is a process where you show only \u201crelevant\u201d data and \u201chide\u201d unnecessary details of an object from the user.<\/p>\n

    For example, when you log in to your bank account online, you enter your user_id and password and press login, what happens when you press login, how the input data sent to the server, how it gets verified is all abstracted away from you.<\/p>\n

    We can achieve \u201c\u00a0abstraction\u00a0<\/strong>\u201d in Java using\u00a02 ways<\/strong><\/p>\n

    1. Abstract class<\/strong><\/p>\n

    2. Interface<\/strong><\/p>\n

    1. Abstract Class<\/p>\n