问题描述
语言是Java.鉴于此:
The language is Java. Given this:
public static void main(String[] args) { Boolean b1 = true; Boolean b2 = true; int i1 = 1; if (b1 = true) //line 5 if (b1 == true} // line 6
我知道 b1 == true 是一个等效的测试,它会给出结果:真或假.但是,对于 b1 = true ,据我了解是一个声明,除了在这种情况下,它应该什么都不返回: b1 = true 返回 true,与 == 测试?
I understand that b1 == true is a equivalent test , which will give the result : true OR false. However, with b1 = true , which to my understanding is a declaration, which should return nothing but in this case : b1 = true returns true, exactly the same as == test?
你能解释一下为什么吗?谢谢!
Can you explain why? Thanks!
推荐答案
if (identifier = literal) 计算结果为:
identifier = literal; if (identifier)
首先将文字分配给标识符.然后你在分配后测试它
first you assign the literal to the identifier. then you test it post assignment