https://github.com/mbrsagor/java

Java OOP
https://github.com/mbrsagor/java

java java-8 object object-oriented oop

Last synced: 9 days ago
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Java OOP

• Host: GitHub
• URL: https://github.com/mbrsagor/java
• Owner: mbrsagor
• Created: 2020-12-17T11:34:00.000Z (about 4 years ago)
• Default Branch: master
• Last Pushed: 2021-06-24T20:44:29.000Z (over 3 years ago)
• Last Synced: 2024-11-13T05:32:05.812Z (2 months ago)
• Topics: java, java-8, object, object-oriented, oop
• Language: Java
• Homepage:
• Size: 41.7 MB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Java OOP

> Java OOP concepts.

There are four main OOP concepts in Java. OOP concepts in Java are the main ideas behind Java’s Object Oriented Programming.

### Table of contents:

- OOP

- Class

- Object

- Constructor

- Inheritance

- Encapsulation

- Polymorphism

- Abstraction

- Interface

###### What is Class?

> Ans: `Class` is a blueprint for creating objects.

```java

class Sagor{

    public static void main(String[] args){

        System.out.println("Hello Sagor");

    }

  }

```

###### What is Object?

> Ans: `Object` is a real data in class or `Object` is an instance of a class.

```java

Sagor ReferenceVariable = new Sagor();

```

###### What is Inheritance?

> Inheritance is a mechanism in which one class acquires the property of another class. For example, a child inherits the traits of his/her parents. With inheritance, we can reuse the fields and methods of the existing class. Hence, inheritance facilitates Reusability and is an important concept of OOPs.

```java

class MbrSagor extends Sagor {

  // body of the class

}

```

###### What is Polymorphism?

> The word polymorphism means having many forms. In simple words, we can define polymorphism as the ability of a message to be displayed in more than one form.

###### What is Interface?

```java

// Interface

interface Animal {

  public void animalSound(); // interface method (does not have a body)

  public void sleep(); // interface method (does not have a body)

}

// Pig "implements" the Animal interface

class Pig implements Animal {

  public void animalSound() {

    // The body of animalSound() is provided here

    System.out.println("The pig says: wee wee");

  }

  public void sleep() {

    // The body of sleep() is provided here

    System.out.println("Zzz");

  }

}

class Main {

  public static void main(String[] args) {

    Pig myPig = new Pig();  // Create a Pig object

    myPig.animalSound();

    myPig.sleep();

  }

}

```