package practicejava;
public class Query {
public static void main(String[] args) {
char ch = 66;
System.out.println("character= " + ch);
ch++;
System.out.println("character = " + ch);
}
}
技术上 ch++;
和 ch=ch+1;
是一样的,但是为什么我写 ch=ch+1;
而不是 ch++;
?
Technically ch++;
and ch=ch+1;
are the same but why do I get an error when I write ch=ch+1;
instead of ch++;
?
你需要提供一个演员表才能做到这一点:
You need to provide a cast in order to do that :
ch = (char) (ch + 1);
这是因为表达式 ch + 1
被提升(upcast)为 int
.为了让您将此表达式重新分配给 char
,您需要显式 downcast 它.
This is because the expression ch + 1
is is promoted (upcast) to an int
. In order for you to reassign this expression to a char
you need to explicitly downcast it.
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