![Example
class A
{
int a =10;
}
class B extends A
{
int a =20;
void display()
{
System.out.println(a);//prints a of B class
System.out.println(super.a);//prints a of A class
}
public static void main(String x[])
{
B b1= new B();
b1.display();
}
}](https://image.slidesharecdn.com/bcasuperkeyword-230403111135-d23ca1b1/85/BCA-Super-Keyword-pptx-5-320.jpg)
![Example
class A
{
void display()
{
System.out.println("Class A");
}
}
class B extends A
{
void display()
{
System.out.println("Class B");
super.display();
}
public static void main(String X[])
{
B b1=new B();
b1. display();
}
}](https://image.slidesharecdn.com/bcasuperkeyword-230403111135-d23ca1b1/85/BCA-Super-Keyword-pptx-8-320.jpg)
![Example
class A
{
A()
{
System.out.println("Class A");
}
}
class B extends A
{
B()
{
super();
System.out.println("Class B");
}
public static void main(String X[])
{
B b1=new B();
}
}](https://image.slidesharecdn.com/bcasuperkeyword-230403111135-d23ca1b1/85/BCA-Super-Keyword-pptx-11-320.jpg)
BCA Super Keyword.pptx
- 2. Super Keyword in Java • The super keyword in Java is a reference variable which is used to refer immediate parent class object. • Whenever you create the object of subclass, an object of parent class is created implicitly which is referred by super reference variable.
- 3. Usage of Java super Keyword 1. super can be used to refer immediate parent class instance variable. 2. super can be used to invoke immediate parent class method. 3. super() can be used to invoke immediate parent class constructor.
- 4. 1. super is used to refer immediate parent class instance variable. • We can use super keyword to access the data member or field of parent class. • It is used if parent class and child class have same fields.
- 5. Example class A { int a =10; } class B extends A { int a =20; void display() { System.out.println(a);//prints a of B class System.out.println(super.a);//prints a of A class } public static void main(String x[]) { B b1= new B(); b1.display(); } }
- 7. 2. super can be used to invoke parent class method • The super keyword can also be used to invoke parent class method. • It should be used if subclass contains the same method as parent class. • In other words, it is used if method is overridden.
- 8. Example class A { void display() { System.out.println("Class A"); } } class B extends A { void display() { System.out.println("Class B"); super.display(); } public static void main(String X[]) { B b1=new B(); b1. display(); } }
- 10. 3. super() can be used to invoke immediate parent class constructor. • The super keyword can also be used to invoke the parent class constructor.
- 11. Example class A { A() { System.out.println("Class A"); } } class B extends A { B() { super(); System.out.println("Class B"); } public static void main(String X[]) { B b1=new B(); } }