Hey can someone explain me the use of "?" and ":"?

Question

I dont know the use of "?" and ":".

return value < current.value
                ? containsNodeRecursive(current.left, value)
                : containsNodeRecursive(current.right, value);

duplicate https://stackoverflow.com/questions/798545/what-is-the-java-operator-called-and-what-does-it-do — Akash Shah, Apr 04 '19 at 10:15

Ondra K. · Answer 1 · 2019-04-04T10:14:05.127

0

Exactly equivalent to this:

if (value < current.value) {
    return containsNodeRecursive(current.left, value);
else {
    return containsNodeRecursive(current.right, value)
}

Just a more compact way of writing it. Usually used for short if/else conditions to not use five lines of code, but only one.

edited Apr 04 '19 at 10:14

answered Apr 04 '19 at 10:13

Ondra K.

2,767
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2

Better not to answer such an obvious duplicate, but link to the original question, where the asker will find much more information. – Ole V.V. Apr 04 '19 at 10:13

score 0 · Answer 2 · answered Apr 04 '19 at 10:13

0

return value < current.value
            ? containsNodeRecursive(current.left, value)
            : containsNodeRecursive(current.right, value);

equals

if (value < current.value)
    return containsNodeRecursive(current.left, value)
else
    return containsNodeRecursive(current.right, value);

that means

condition ? do if true : do if false

answered Apr 04 '19 at 10:13

Nikolay Gonza

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Better not to answer such an obvious duplicate, but link to the original question, where the asker will find much more information. – Ole V.V. Apr 04 '19 at 10:15

Hey can someone explain me the use of "?" and ":"?

2 Answers2