CODEWITHSUNDEEP
java
Mazzy
Mazzy

Reputation: 14179

take the value of enum and covert it to String

I should take from a variable enum its value and transform it to string.how can i do?

here it is the type enum:

 public enum State{
      b,c,p;

 };

now i have to insert into an object String one value.

Upvotes: 0

Views: 197

Answers (6)

Mansoor Siddiqui
Mansoor Siddiqui

Reputation: 21653

Method #1: Using the built-in toString() and name() methods

If you want to print a String that is the same as the value of the State, then you can use the toString() method, or the name() method.

System.out.println(State.b); // Prints "b"
System.out.println(State.c); // Prints "c"
System.out.println(State.p); // Prints "p"

Method #2: Using a constructor to create a custom mapping

If you want to have a custom String associated with each of those states, you can use a constructor to associate a particular value with each enum value:

public enum State{
    b("State B"), c("State C"), p("State P");

    private String longName;
    private State(String longName) {
        this.longName = longName;
    }
    @Override
    public String toString() {
        return this.longName;
    }
};

Of course, if you don't want to break the default toString() usage, you can create a different method called getFullName(), for example, to return the custom value.

Upvotes: 1

Dogmatixed
Dogmatixed

Reputation: 794

I tend to do something more complicated, but I find that it's more flexible:

public enum MyEnumeration {
    SOME_NAME("Some Name"),
    OTHER_THING("Other Thing"),
    ...
    MORE_VALUES("More Values"),

    private final String displayName;

    private MyEnumeration(String displayName) {
        this.displayName = displayName;
    }

    public String getDisplayName() {
        return displayName;
    }
}

This way, I use standard capitalization for my enums in code, but can have a more presentable name for them. This trick can also be used to replace ordinal, by initializing a number, and then you don't need to worry about rearranging your enums.

Upvotes: 1

toto2
toto2

Reputation: 5326

Usually, 

State state = ...;
String string = state.toString();

should work, but it is not recommended since someone might override toString for some other purpose.

Instead the method you are looking for is 

String string = state.name();

As an aside, your enumerated stated should always be all in capitals, and they should have descriptive names. It's not a language rule, but a convention. For example enum State { ON, OFF, PAUSED; }.

Upvotes: 2

GETah
GETah

Reputation: 21409

State.b.toString() will return "b". The same goes for the other ones.

Upvotes: 2

aleroot
aleroot

Reputation: 72626

you can use name() or toString(), so :

State aState = State.c;
String strState = aState.name();

See here the official java reference for more information...

Upvotes: 2

rabusmar
rabusmar

Reputation: 4143

You might use enum.name orenum.toString to get the name of the enum constant, or enum.ordinal to get the ordinal position.

Upvotes: 2

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