Lecture 3: Constructors

Code:

// constructor
class Constructors{
    int id;
    int age;
    
    Constructors(int id,int age){
        this.id = id;
        this.age = age;
        System.out.println("Hello");
    }
}


public class Main{

    public static void main (String[] args) {
        
        Constructors A = new Constructors(23,5);
    }
}

Two types of Constructors

Default Constructors

class Constructors{
    Constructors(){
        System.out.println("Default Constructor");
    }
}


public class Main{

    public static void main (String[] args) {
        
        Constructors A = new Constructors();
    }
}

Parameter Constructor

class Constructors{
    int id;
    int age;

    Constructors(int id,int age){
        this.id = id;
        this.age = age;
        System.out.println("Parameter Constructors");
    }
}

public class Main{

    public static void main (String[] args) {
        
        Constructors A = new Constructors(23,5);
    }
}

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Lecture 4: Four Pillars of OOPS

Codes:

Abstraction:

Encapsulation:

```js ```

Polymorphism

```js ```

Inheritance

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