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I know that Java enums are compiled to classes with private constructors and a bunch of public static members. When comparing two members of a given enum, I've always used .equals(), e.g.
public useEnums(SomeEnum a) { if(a.equals(SomeEnum.SOME_ENUM_VALUE)) { ... } ... } However, I just came across some code that uses the equals operator == instead of .equals():
public useEnums2(SomeEnum a) { if(a == SomeEnum.SOME_ENUM_VALUE) { ... } ... } Which operator is the one I should be using?
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There are two ways for making comparison of enum members :equals method uses == operator internally to check if two enum are equal. This means, You can compare Enum using both == and equals method.
Yes, == is fine - there's guaranteed to be just a single reference for each value. An even better way of doing it is to put the functionality within the enum itself, so you could just call roundingMode.
Enum implements Comparable interface and it's compareTo() method compares only same type of enum. Also natural order of enum is the order in which they are declared in code.
Both are technically correct. If you look at the source code for .equals(), it simply defers to ==.
I use ==, however, as that will be null safe.
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