Object-Oriented Programming (Narva College) 2019/20 spring

Chapter 2

Value methods

The value method is a method that returns a value.

The syntax of a value method is similar to the void type methods:

 public static returnValueType myMethod( list_of_parameters ) {
     // statements;
     return value;
 }

Unlike void methods, in the return type methods:

1. the method header contains the data type of the value (returnValueType) to be returned;
2. the last statement of the method body contains a keyword return followed by the value to be returned.

An example of the return type method definition and call:

public class ThreeNumbers {
    public static double multiplyThreeNumbers(double a, double b, double c) {
        return a*b*c;
    }

    public static void display(double a, double b, double c) {
        System.out.println("Numbers: " + a + ", " + b + ", " + c);
    }

    public static void main(String[] args) {
        double x = 1.5;
        double y = 2.25;
        double z = 3;
        display(x, y, z);
        System.out.println("The result of multiplication: " + multiplyThreeNumbers(x, y, z));
        System.out.println("The result is " + multiplyThreeNumbers(5, 6.2, 8.0));
    }
}

Chapter 2