What is the use of extend () ?????

Question

It is said something related to class

Answer 1

as per my knowledge, I didn't see any extend() method in java. but
there is a keyword "extends" in java used to inherits variables and methods from super class to sub class. refer inheritance concept.

Answer 2

sure man,
super class is nothing but a parent class from which we are deriving our child class with extended functionality.

when we extends a class from super class, then all members (other than private) available in sub class. all members means may be variables or methods.
see follow example:

class Parent{
void add(int num1, int num2){
System.out.println("sum is: "+ num1+num2);
}
}

class Child extends Parent{
public static void main(String[] args){
Child c = new Child();
c.add(10,20);
}
}

now note that in above two classes Parent class is super class and Child class is sub class (i.e. sub class of parent).
now see that in Parent class I have created add() method with two int parameters, in Child class i have call that method using Child class object.
i.e. I am calling the add() method defined in Parent class directly from our Child class using our Child class object.

hope you uderstand...
right back if any confusion :)