Explain different use of super with the help of java program?

Answer 1

the keyword super is used to access methods/variables of the parent class.

ex:

public class A {

public String getName(){

.....

}

}

public class B extends A {

public String getName(){

.....

}

}

If you want to access the method getName of class A inside class B you cannot do directly because the compiler would get confused. you need not create an object of A since it is already available. At this point you can use super

super.getName() is enough to call the method of the parent class

Answer 2

Super is usually used to explicitly call methods of the parent class. There maybe cases where a child class & parent class have methods of the same name. If we just mention the method name, the child class method only would be called. So to explicitly call the parent class method we would use super.

Example:

Lets assume class A has a method getName();

public class B extends A {

public String getName(){

}

public void xxx(){

String xyz = super.getName();

}

}

by using super we are explicitly calling the method in the parent class A

Answer 3

The super keyword is used to call variables, methods, and/or constructors of a parent class. If references the parent class through the super keyword (super.[field] or super.[method/constructor]([args])).

The final keyword has a few uses.

1. The most common is to make a variable's value constant, and create a compile error if it is changed after its first assignment of a value. This does not mean that the variable is immutable: the value itself can possibly change, but the assignment to that value cannot.
2. A method declared final cannot be changed in a subclass.
3. A final class cannot be subclassed.

Answer 4

They keyword super is used in the Java programming language when we use Inheritance. Let us say a class A extends another class B and it needs to invoke a certain method in the parent class it can do so by:

super.method();

The keyword super can be stacked up one on top of another to access multiple layers of parent classes.

super.super.method() will invoke the method in the class that is the parent class of the current class's parent class. Second level.