为什么下面的代码编译不出来
Why doesn't the following code compile
int n = 5;
char c = n;
但以下确实编译
char c = 5;
我不是在这两种情况下都给 char 分配了一个整数值吗?
Aren't I just assigning an integer value to char in both cases?
可以将 char
分配给 int
而无需强制转换,因为这是一种扩大转换.反过来,将 int
转换为 char
需要强制转换,因为它是一种缩小转换.
A char
can be assigned to an int
without a cast because that is a widening conversion. To do the reverse, an int
to a char
requires a cast because it is a narrowing conversion.
另请参阅 JLS.第 5 章.转化和促销.
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