Java三元（即时）评估 [英] Java ternary (immediate if) evaluation

问题描述

我无法找到规范的相关部分来回答这个问题。
在Java中的条件运算符语句中，是否评估了true和false参数？

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?

以下可能会抛出NullPointerException

So could the following throw a NullPointerException

Integer test = null;

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

推荐答案

既然你想要规格，这里就是（来自§15.25条件运算符？：，该部分的最后一句）：

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

未针对条件表达式的特定评估评估未选择的操作数表达式。 / p>

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

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