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