Java

TOPIC 30 – VOID FUNCTIONS

LESSON NOTE

RETURN-TYPE OF VOID

We have already worked with return-types of type int, double and String. We will now consider void.

Functions can have a return-type of void. This simply means that the function will not return anything at all. Such functions don’t even need a return statement.

Once a void function is done being executed, Java jumps back to the location where the function was called.

PURPOSE

For now, the main purpose of a void function is probably to output information to screen. However, in the future, we will use void functions a lot more in order to update and alter data.

VOID FUNCTION CALLS

Functions calls to void functions are a little different than other function calls because they do not return anything. Therefore, the entire line is simply the function call.

EXAMPLE – VOID FUNCTION IMPLEMENTATION

Create a void function called outputName that gets two String arguments called first and last and outputs the person’s full name with spacing.

public static void outputName(String first, String last)

{

System.out.println(first + " " + last);

}

EXAMPLE – VOID FUNCTION CALL

Assuming the above function is located in a class called Fun, make use of the function above.

Fun.outputName("Patrick", "Campeau");