java 比较枚举的最佳方法
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The best way to compare enums
提问by Colin
I have an enum, for example enum Color { Red, Brown }. I also have some variables of that type:
例如，我有一个枚举enum Color { Red, Brown }。我也有一些这种类型的变量：
Color c1 = Brown, c2 = Red
What is best way to compare to a constant value:
与常量值进行比较的最佳方法是什么：
if (c1 == Color.Brown) {
//is brown
}
or
或者
if (c1.equals(Color.Brown)) {
//is brown
}
回答by Mark Peters
Use ==. There cannot be multiple instances of the same enum constant (within the context of a classloader, but let's ignore that point) so it's always safe.
使用==. 同一个枚举常量不能有多个实例（在类加载器的上下文中，但让我们忽略这一点）所以它总是安全的。
That said, using equals()is safe too, and will perform reference equality as well. It's pretty much a style choice.
也就是说， usingequals()也是安全的，并且也会执行引用相等。这几乎是一种风格选择。
Personally I very seldom find myself using ifstatements for enums at all. I favour switchblocks.
就我个人而言，我很少发现自己使用if枚举语句。我喜欢switch块。
switch (c1) {
case Brown:
//is brown
break;
case Red:
//...
}
