(3 answers) A switch works with the byte, short, char, and int primitive data types. You learned something, right? Code: const directions= {EAST: 'east', Because it's a duplicate? @GlenPeterson FYI if you're trying to optimize for speed, the switch statement approach might be faster because it's just a table lookup in the bytecode. Apr 02, 2019 Core Java, Snippet, String comments Java Enums is a new feature introduced in Java 5. 【Java】labelを使うことにより、break文で処理が推移する場所を指定できることを確認しました。 A better way to implement enum constant is by using object, lets see the below example. Java Enum To String. Enum Constant with Objects. It also works with enumerated types (discussed in Enum Types), the String class, and a few special classes that wrap certain primitive types: Character, Byte, Short, and Integer (discussed in Numbers and Strings). So, in my example I could add "final protected void commonMethod() { ... }" and then the implementation of method() in each constant would just call commonMethod().Now that this question has been closed as a duplicate, I notice that one of the duplicates has an answer quite (perhaps eerily) similar to mine: Why? Also, I've seen code that puts enum constants into arrays and then indexes into the arrays - this opens the possibility of array index out of bounds exceptions - just use the enum! String型のswitch文でエラーが。。。 どうも、ハザマです！ 先日、Javaのswitch文でString型が使えないという問題にぶち当たったので、メモがてら残しておきます。 正直「な、なんですと？！」状態でした。。。調べてみると、Java 6（1.6系）はそうだったみたいですね。 In this enum/switch example, I first declare an enumtype that looks like this: Then in the main portion of the program, I refer to that enum, both in my main method, and in the “print” method that I call from the mainmethod. Why duplicate flags, look at how precise is the heading, easy to find for new users.You can take a look at this article to see how it's done: "It seems simple enough to do and would make for some convenient code." It seems simple enough to do and would make for some convenient code. That said, I've been programming Java for 14 years and I don't remember a single case where I kept a switch statement in production code. read it and understand what's going on: site design / logo © 2020 Stack Exchange Inc; user contributions licensed under The Overflow Blog Learn all that you can about them to use them effectively.Also note if you have several enum constants that all have the same behavior for a particular method (like @CoolBeans days of the week example in which weekend days have the same behavior and the weekdays Tuesday through Thursday also share the same behavior), you can simply gather that shared code in an enum method that is not overridden by every constant (final protected) and then call that method from the appropriate methods.

Java enum to String To get single enum value (e.g. Somebody else probably did too. Stack Overflow for Teams is a private, secure spot for you and In comparison with the above example by CoolBeans.. you might be doing the following:Make sure that you use the actual enum values instead of EnumType.EnumValueActually you can use a switch statement with Strings in Java...unfortunately this is a new feature of Java 7, and most people are not using Java 7 yet because it's so new. Yes Java is simple but convenient Java isn't! That alone makes it valuable.+1 However I found that when you assign, you must use day = Day.Monday; Otherwise I was getting a 'cannot find symbol' compile error. Then we get all Enum instances in an array using Enum.values() method and by using advanced for loop of Java 5, we loop through each of that Enum instance. Let’s take a look at the Java source code for my enumexample, and then I’ll describe it afterwards: When you compile and run this code, the output looks like this: The output is in this order because the enum begins on SUNDAY, and goes in order from there until SATURDAY. @GlenPeterson, that assumes you're compiling the enum code yourself, which is obviously not always the case.One of the nice things about this approach is that it is simply impossible to get certain types of errors. You can use enumerations to store fixed values such as days in a week, months in a year etc.You can also define an enumeration with custom values to the constants declared.

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