CODEWITHSUNDEEP
javawhile-loopbooleanreturnsingly-linked-list
mark
mark

Reputation: 2931

Java - Does returning a value break a loop?

I'm writing some code that basically follows the following format:

public static boolean isIncluded(E element) {
    Node<E> c = head;
    while (c != null) {
        if (cursor.getElement().equals(element)) {
            return true;
        }
        c = c.getNext();
    }
    return false;
}

The code will search for an element in a list of nodes. However, my question is that if the while loop does find the element where the if-statement says it should return true, will it simply return true and break the loop? Furthermore, if it does then break the loop will it then carry on through the method and still return false, or is the method completed once a value is returned?

Thanks

Upvotes: 52

Views: 121414

Answers (5)

Hobbyist
Hobbyist

Reputation: 16202

I should also add that if you want to break the current iteration of the loop, and instantly start the next one, you can use:

continue;

As it seems nobody has suggested it.

Upvotes: 19

Mark Byers
Mark Byers

Reputation: 838366

Yes*

Yes, usually (and in your case) it does break out of the loop and returns from the method.

An Exception

One exception is that if there is a finally block inside the loop and surrounding the return statement then the code in the finally block will be executed before the method returns. The finally block might not terminate - for example it could contain another loop or call a method that never returns. In this case you wouldn't ever exit the loop or the method.

while (true)
{
    try
    {
        return;  // This return technically speaking doesn't exit the loop.
    }
    finally
    {
        while (true) {}  // Instead it gets stuck here.
    }
}

Upvotes: 109

cobie
cobie

Reputation: 7271

Return whenever called exits a method from wherever it is and returns a value to the caller.

Upvotes: 2

SJuan76
SJuan76

Reputation: 24885

Yes.

Anyway, for questions as short as this, I think you would be better (and get an earlier answer) just trying it by yourself.

Upvotes: 10

Keith Randall
Keith Randall

Reputation: 23265

Return does break the loop and returns from the entire method immediately. The only code that will be executed on the way out is the body of a finally clause and the release of any synchronized statement.

Upvotes: 23

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