Multiple logical expressions in one if statement in java

Question

Hi I have this example:

  (1)
  if(false && false ||true){
            System.out.println("a");
  }

result:

and

  (2)
  if(false && false | true){
            System.out.println("a");
  }

result:

(empty)

In case (1) we have short-circuit OR , but in the second we have long-circuit OR. From where comes the difference in the behavior? I know that the expression is evaluated from left to right and AND have bigger priority than OR, so I can't figure out why this happens in case 2?

score 5 · Answer 1 · answered Sep 28 '14 at 09:48

5

&& has priority over || but not over |. See operator precedence list.

answered Sep 28 '14 at 09:48

assylias

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SO first will be calculated false | true -> true ,and then false && true->false? – Xelian Sep 28 '14 at 09:53

score 3 · Accepted Answer · edited Sep 28 '14 at 10:43

(1)

if (false && false || true) {
    System.out.println("a");
}

Here && has higher precedence than ||

false && false gets evaluated first resulting false.
false || true gets evaluated resulting true.

So the result outputs "a".

(2)

if (false && false | true) {
    System.out.println("a");
}

Here | has higher precedence than &&

false | true gets evaluated first resulting true.
false && true gets evaluated resulting false.

So nothing is output.

Hope it makes sense

Multiple logical expressions in one if statement in java

2 Answers2