Java char到字节转换 [英] Java char to byte casting

问题描述

我一直在测试char cast，我经历了这个：

I have been testing the char casting and I went through this:

public class Test {
    public static void main(String a[]) {
        final byte b1 = 1;
        byte b2 = 1;
        char c = 2;

        c = b1; // 1- Working fine
        c = b2; // 2 -Compilation error
    }
}

任何人都可以解释为什么会这样当我在字节中添加最后一个时工作正常吗？

Can anyone explain why it's working fine in 1 when I added a final to the byte?

推荐答案

当变量是 final ，编译器自动内联其值为1.此值可表示为 char ，即：

When the variable is final, the compiler automatically inlines its value which is 1. This value is representable as a char, i.e.:

c = b1;

相当于

c = 1;

事实上，根据关于最终变量的这一部分， b1 被视为常量：

In fact, according to this section on final variables, b1 is treated as a constant:

基本类型或类型的变量 String ，即 final 并使用编译时常量表达式（第15.28节）初始化，称为常量变量。

A variable of primitive type or type String, that is final and initialized with a compile-time constant expression (§15.28), is called a constant variable.

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