Java 你能用 == 比较字符吗？
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Can you compare chars with ==?
提问by abinmorth
For Strings you have to use equals to compare them, because == only compares the references.
对于字符串，您必须使用 equals 来比较它们，因为 == 只比较引用。
Does it give the expected result if I compare chars with == ?
如果我将字符与 == 进行比较，它会给出预期的结果吗？
I have seen similar questions on stackoverflow, E.g.
我在stackoverflow上看到过类似的问题，例如
However, I haven't seen one that asks about using == on chars.
但是，我还没有看到询问在字符上使用 == 的问题。
采纳答案by Krzysztof Cichocki
Yes, charis just like any other primitive type, you can just compare them by ==.
是的，char就像任何其他原始类型一样，您可以通过==.
You can even compare char directly to numbers and use them in calculations eg:
您甚至可以将 char 直接与数字进行比较并在计算中使用它们，例如：
public class Test {
public static void main(String[] args) {
System.out.println((int) 'a'); // cast char to int
System.out.println('a' == 97); // char is automatically promoted to int
System.out.println('a' + 1); // char is automatically promoted to int
System.out.println((char) 98); // cast int to char
}
}
will print:
将打印：
97
true
98
b
回答by Pod
Yes, but also no.
是的，但也不是。
Technically, ==compares two ints. So in code like the following:
从技术上讲，==比较两个ints。所以在如下代码中：
public static void main(String[] args) {
char a = 'c';
char b = 'd';
if (a == b) {
System.out.println("wtf?");
}
}
Java is implicitly converting the line a == binto (int) a == (int) b.
Java 正在隐式地将行a == b转换为(int) a == (int) b.
The comparison will still "work", however.
然而，这种比较仍然“有效”。
