super Keyword

The super keyword in Java is used to refer to the parent class (superclass) from a child class (subclass). It is mainly used to access parent class variables, methods, and constructors. It helps to remove confusion when both parent and child class have the same method or variable names.

The super keyword is used in two main ways:

To access attributes and methods of the parent class
To call the parent class constructor

Example

class Parent {

int x = 10;

// Parent class method
void show() {
System.out.println("This is Parent class method");
}
}

class Child extends Parent {

int x = 20;

void display() {

// Access child class variable
System.out.println("Child class x = " + x);

// Access parent class variable using super
System.out.println("Parent class x = " + super.x);

// Call parent class method using super
super.show();
}
}

public class Main {
public static void main(String[] args) {

// Creating object of Child class
Child obj = new Child();

// Calling child class method
obj.display();
}
}