Lesson 3 - Introduction to Methods

We have already used methods in Java when we called println:

System.out.println("Hello world!");

We do not need to know what actually takes place when we call such method. We, as users of a method, should only care about how to call the method. In this lesson we are going to write a method.

What you are going to learn

In this lesson we are going to learn how to write a method and how to call a method.

Instructions

There are three TODO marks in the source code. Follow the instructions until you have no test errors.

Theory

A method consists of a method signature and a method body.

public void m(int a, int b, int c) {
    System.out.println(a);
    System.out.println(b);
    System.out.println(c);
}

The method signature tells us how a method should be called. In this lesson we only care about what arguments a method requires. In the previous example the method signature is:

public void m(int a, int b, int c)

The method body is what the method does. It is inside of the body that we should write imperative statements such as "print this", or "do a certain calculation." In the previous example, the method body is:

    System.out.println(a);
    System.out.println(b);
    System.out.println(c);