Practice›Java Fundamentals›Module 3. Methods ›3.3 Return values

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3.3 Methods — returning a value

Lesson

Handing a value back

Instead of just printing, a method can return a value to whoever called it. The return type (written before the name) says what kind of value comes back — int, double, String, boolean. The return statement sends the value back and ends the method.

Worked example

int square(int n) {
    return n * n;
}

System.out.println(square(5));   // 25

The return type is int; return n * n hands back 25, which is then printed.

▶ Try it: square(int n) returns n * n. Run this, then change 5 to other numbers and re-run.

public class Main {
    static int square(int n) {
        return n * n;
    }
    public static void main(String[] args) {
        System.out.println(square(5));
    }
}

square(int n) returns n * n. What value does square(5) give back?

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What is the return type of int square(int n)?

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Assemble a statement that returns n squared.

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True or false?

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Type exactly what this program prints.

public class Main {
    static int twice(int n) {
        return n * 2;
    }
    public static void main(String[] args) {
        System.out.println(twice(6));
    }
}

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