if(functionA() || functionB()).How it works in java?

Question

I have two functions: functionA() and functionB(), both have a return type boolean.

I want to continue my execution if either one of them returns true and if functionA returns true I don't want function B to execute.

As && works (if one is false it does not check the other), does || works the same?

if(functionA() || functionB()){
//Do Your Work
}

Will the above code satisfy my requirement?

Why don't you try it out instead of wasting time asking a question here? — adarshr, Jul 03 '13 at 10:27
An answer that is proper will just state "Yes.". It is very easy to try this on your own. — HonkyTonk, Jul 03 '13 at 10:27

score 6 · Answer 1 · answered Jul 03 '13 at 10:27

6

As specified by the Java Language Specification, §15.24:

The conditional-or operator || operator is like | (§15.22.2), but evaluates its right-hand operand only if the value of its left-hand operand is false.

answered Jul 03 '13 at 10:27

Marko Topolnik

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score 3 · Answer 2 · answered Jul 03 '13 at 10:26

3

If your first function returns true then logical OR short circuites your second function.

http://en.wikipedia.org/wiki/Short-circuit_evaluation

answered Jul 03 '13 at 10:26

Suresh Atta

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"By default"? Can you change this behavior in Java?? – Antti Huima Jul 03 '13 at 10:27
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@antti.huima Java also has the `&`/`|` _logical_ operators (not bitwise), which will evaluate _all_ conditions even if one is false/true. That is, these two operators do not short circuit. – fge Jul 03 '13 at 10:30

score 0 · Answer 3 · answered Jul 03 '13 at 10:27

0

Yes this will exactly do what you want. Run functionA() and if that does not return true run functionB()

answered Jul 03 '13 at 10:27

John Smith

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you should choose Marko Topolnik's answer, he added a reference. – John Smith Jul 03 '13 at 10:29

score 0 · Answer 4 · answered Jul 03 '13 at 10:28

0

Lazy evaluation in java will avoid your functionB() if functionA() returns true.

if(functionA() | functionB())

Can get you through this mechanism and forces the evaluation of your two functions.

answered Jul 03 '13 at 10:28

teh internets is made of catz

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score 0 · Answer 5 · answered Jul 03 '13 at 10:29

0

Yes it will, if you wanted it to execute both you would have done if(functionA() | functionB()){

note, only one vertical bar

answered Jul 03 '13 at 10:29

Viktor Mellgren

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score 0 · Answer 6 · answered Jul 03 '13 at 10:38

0

Yes definitely it will execute function A() and if it will return true then function B() will not run and you other code will be executed as u want.

answered Jul 03 '13 at 10:38

Manish Doshi

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score 0 · Accepted Answer · edited Jul 03 '13 at 10:52

0

boolean f1 = functionA();
boolean f2 = functionB();

if(f1 || f2){
// if statement
} else {
// else statement
}

edited Jul 03 '13 at 10:52

teh internets is made of catz

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answered Jul 03 '13 at 10:46

Sharma

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this is just sample code, not an answer to the question. Also it is not what the user asked, since it runs both functionA and functionB no matter if the result of functionA is true. – John Smith Jul 22 '13 at 12:24

if(functionA() || functionB()).How it works in java?

7 Answers7