Function in java

Functions in java or any other language helps to reduce the lines of codes in our program.

Suppose we have to perform a particular task repeatedly but not continuous repetition like loops then instead of writing those line of code we used to make a function with some name just need to call it at the time of our need.

      Function has following  parts:-

·         Name : As the name suggests, the function should have proper name.

·         Definition : definition means function should have those statements that are performing the required task.

·         Return type: return type says that what type of value a function returns whether it is integer, character etc.

NOTE: Return type of a function could be void which means it does not return nay value.

·         Arguments :the parameters on which the task is to be performed.

NOTE: it is not necessary for a function to have a arguments.

Syntax :

           return_type function_name(arguments)

                  {

                    // statements

               }

Example:

1.       class Function {

2.       void display (int n)        //CREATION OF FUNCTION                                                       

3.       {

4.       System.out.println("Function with arguments and without any return statement");

5.       }

6.       int show()

7.       {

8.       System.out.println("Function without arguments but with return value");

9.       return 10;

10.   }

11.   public static void main(String [] args)

12.   {

13.   Function fn=new Function();

14.   int rtrn;

15.   fn.display(10); //CALLING FUNCTION display()

16.   rtrn=fn.show();// CALLING FUNCITON show()

17.   }

18.   }

On running the above program we get the output as:

Important points to remember regarding function:

1.            A function may or may not return any value.
2.           A function may or may not have arguments.
3.          It is not necessary that function is in same class in which it is called.
4.           A function without any argument may return a value and vice versa.

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Kishan Agarwal

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