为什么要在Java中将字符从char显式转换为int？ [英] Reason to explicitly cast from char to int in Java?

问题描述

我在Java代码的很多地方都看到过，人们倾向于在基元int和char之间进行转换。

I have seen in Java code in many places, people tend to cast between primitives int and char.

这有必要吗？它们不是隐式转换的吗？

例如我尝试了一下，完全得到了我应该做的。那为什么人们要明确地投身呢？我错过了什么吗？

Is this necessary? Are they not implicitly converted.
For e.g. I tried this and exactly got what I should. Then why do people explicitly cast? Am I missing something?

char a = 'a';
int index = (int) a;
index = 98;
a = 98;
System.out.println(index);
System.out.println(a);

推荐答案

有时候人们会为清楚起见，有时出于重载的原因，有时是出于无知的原因。

Sometimes people will cast for clarity, sometimes for overloading reasons, and sometimes for reasons of ignorance.

例如：

System.out.println((int) a);

的工作方式与

System.out.println(a);

由于过载解析。但是，按照您提供的确切代码，绝对不是必需的。如果您想确切地知道为什么某个特定的开发人员选择编写冗余代码，则需要询问他们...

due to overload resolution. But in the exact code you've given, it's definitely not required. If you want to know exactly why a particular developer has chosen to write redundant code, you'd need to ask them...

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