Java short style if evaluation

Question

I can't find the relevant portion of the spec to answer this. In a conditional operator statement in Java, are both the true and false arguments evaluated?

So could the following throw a NullPointerException

Integer test = null;

test != null ? test.intValue() : 0;

Answer 1

No, it couldn't. That's the same as:

Integer test = null;
if ( test != null ) { 
    test = test.intValue();
}
else {
    test = 0;
}

Answer 2

This don't throw NPE

Answer 3

Since you wanted the spec, here it is (from §15.25 Conditional Operator ? :, the last sentence of the section):

The operand expression not chosen is not evaluated for that particular evaluation of the conditional expression.

Answer 4

BTW, this is not called a "short circuit statement" - it's the "ternary" or (most correctly) "conditional operator". The short circuit boolean operators are || and &&.

Answer 5

the syntax is wrong .

Integer test = (test != null) ? test.intValue() : 0;

hope it helps ....