Return values in Java - Cheat Sheet & Quick Revision

overview

Recall & Review

beginner

What is a return value in Java?

A return value is the result a method sends back to the part of the program that called it. It lets the method give information after it finishes running.

beginner

How do you specify the type of value a method returns in Java?

You write the type before the method name in its declaration. For example, int means the method returns an integer number.

intermediate

What happens if a method has a return type other than void but does not use a return statement?

The program will not compile. Java requires that all paths in such a method return a value matching the declared type.

intermediate

Can a method return multiple values directly in Java?

No, a method can return only one value. To return multiple values, you can use an object or an array to hold them.

beginner

What does the void keyword mean in a method declaration?

It means the method does not return any value. It just runs its code and finishes without sending anything back.

What keyword is used to send a value back from a method in Java?

A output

B send

C return

D yield

If a method is declared as int calculate(), what must it do?

A Return an integer value

B Return nothing

C Return a string

D Throw an exception

What will happen if a method with return type double does not have a return statement?

A Runs without error

B Compilation error

C Returns null

D Returns 0.0 automatically

Which of these methods does NOT return a value?

A void printMessage()

B int getNumber()

C String getName()

D double calculateArea()

How can a method return multiple values in Java?

A By calling return several times

B By using multiple return statements

C By declaring multiple return types

D By returning an object or array containing the values

Explain what a return value is and why it is useful in Java methods.

Describe the difference between a method with a void return type and one with a specific return type.