The program given in this section demonstrates how to use the super keyword to invoke the parametrized constructor of the superclass. This program contains a superclass and a subclass, where the superclass contains a parameterized constructor that accepts an integer value, and we used the super keyword to invoke the parameterized constructor of the superclass.

Copy and paste the following program in a file with the name Subclass.java

class Super_class {

int num = 20;

// display method of superclass

public void display() {

System.out.println("This is the display method of superclass");

}

}

public class Sub_class extends Super_class {

int num = 10;

// display method of sub class

public void display() {

System.out.println("This is the display method of subclass");

}

public void my_method() {

// Instantiating subclass

Sub_class sub = new Sub_class();

// Invoking the display() method of sub class

sub.display();

// Invoking the display() method of superclass

super.display();

// printing the value of variable num of subclass

System.out.println("value of the variable named num in sub class:"+ sub.num);

// printing the value of variable num of superclass

System.out.println("value of the variable named num in super class:"+ super.num);

}

public static void main(String args[]) {

Sub_class obj = new Sub_class();

obj.my_method();

}

}