Java中的递增字符类型

2022-01-12 00:00:00 char java

在练习 Java 时,我随机想到了这个:

While practicing Java I randomly came up with this:

class test
{
    public static void main(String arg[])
    {
        char x='A';
        x=x+1;
        System.out.println(x);
    }
}

我以为它会抛出一个错误,因为我们不能将数值 1 与数学中的字母 A 相加,但是下面的程序运行正确并打印

I thought it will throw an error because we can't add the numeric value 1 to the letter A in mathematics, but the following program runs correctly and prints

B 

这怎么可能?

推荐答案

在 Java 中,char 是数字类型.当您将 1 添加到 char 时,您将进入下一个 unicode 代码点.如果是 'A',下一个代码点是 'B':

In Java, char is a numeric type. When you add 1 to a char, you get to the next unicode code point. In case of 'A', the next code point is 'B':

char x='A';
x+=1;
System.out.println(x);

请注意,您不能使用 x=x+1,因为它会导致隐式缩小转换.您需要改用 x++x+=1.

Note that you cannot use x=x+1 because it causes an implicit narrowing conversion. You need to use either x++ or x+=1 instead.

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