how does java check conditions with logical operators

Question

assume I have something simple like this:

if(condition_1 || condition_2) {
do something
}

if condition_1 is true, does java go on and also check condition_2? I'm asking because I know if condition1 is true, condition2 will throw an error and I'm wondering if I need to make two seperate if's.

Answer 1

No. Java uses short-circuiting operators:

• if (condition1 || condition2) Condition 2 will only be evaluated if condition1 is false.
• if (condition1 && condition2) Condition 2 will only be evaluated if condition1 is true.

In general: The second condition will only be evaluated if needed.

See Java operators for further information about this.

Answer 2

if(condition_1 || condition_2) 
if condition_1 is true, does java go on and also check condition_2?

No!

Google short circuiting concept.

Answer 3

You can also let check both conditions with using just one | token.

if (trueField | isButtonDown()) {
    //
}

Event if the first one is true, the method is called. With two ||, it will not be called.