布尔和== VS = [英] Boolean and == vs =

问题描述

的语言是Java。
鉴于这种

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

据我所知， B1 ==真是一个等效试验，这将给结果：TRUE或FALSE。然而，随着 B1 = TRUE ，这在我的理解是一个宣言，这应该返回什么，但在这种情况下： B1 = TRUE 返回true，完全一样的 == 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

如果（标识=文字）计算为：

identifier = literal;  
if (identifier)

首先分配字面的标识符。那么你测试后分配

first you assign the literal to the identifier. then you test it post assignment

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