How do I return an enum to a String?
String name = Modes.mode1.name(); // Returns the name of this enum constant, exactly as declared in its enum declaration. Show activity on this post. Every enum has both a name() and a valueOf(String) method. The former returns the string name of the enum, and the latter gives the enum value whose name is the string.
What is EnumSet in Java?
An enumSet is a Java Collections member, it is not synchronized. An enumSet is a high performing set implementation that works faster than the HashSet. All the elements in an enumSet must be of a single enumeration type that is specified when the set is created.
Is EnumSet immutable?
Yes EnumSet is modifiable.
Can enum values be string?
The Java enum type provides a language-supported way to create and use constant values. By defining a finite set of values, the enum is more type safe than constant literal variables like String or int.
Can enum have string values?
The enum can be of any numeric data type such as byte, sbyte, short, ushort, int, uint, long, or ulong. However, an enum cannot be a string type.
What is an EnumSet?
An EnumSet is a specialized Set collection to work with enum classes. It implements the Set interface and extends from AbstractSet: Even though AbstractSet and AbstractCollection provide implementations for almost all the methods of the Set and Collection interfaces, EnumSet overrides most of them.
How do I create an empty EnumSet?
Use EnumSet. noneOf(Class) to create an empty EnumSet.
What does enum name return?
Description. The java.lang.Enum.name() method returns the name of this enum constant, exactly as declared in its enum declaration.
Can you print enums Java?
By default, when you print an enum constant, it prints its literal value e.g. if the name of the enum instance is RED, then it will print RED. This is also the value that is returned by the name() method of java. lang. Enum class.
Can enum store string?
Enum constants can only be of ordinal types ( int by default), so you can’t have string constants in enums.
Can we define string in enum?
We can’t define enumeration as string type. The approved types for an enum are byte, sbyte, short, ushort, int, uint, long, or ulong.
How do you declare an EnumSet?
All of the elements in an EnumSet must come from a single enumeration type that is specified when the set is created either explicitly or implicitly….Methods of EnumSet.
| Method | Action Performed |
|---|---|
| allOf(Class elementType) | Creates an enum set containing all of the elements in the specified element type. |
How do you create an EnumMap?
util. EnumMap class. K: It is the type of keys maintained by this map. V: It is the type of mapped values….Constructors of Java EnumMap class.
| Constructor | Description |
|---|---|
| EnumMap(Class keyType) | It is used to create an empty enum map with the specified key type. |
How do you create an empty EnumSet in Java?
How do I return an enum in Java?
How can I return enums like this? on a sidenote, according to java conventions enums should start with an upper case letter. An enum is a (special type of) class, so you should declare it as the return type of your method. By the way, it would be better to name it Decision (it is a class).
Is enum string Java?
How do I print all enums?
You don’t have to override toString method in each enum element. Every enum have method name() that returns String representation of element that invoked this method: SomeEnum.VALUE.name() will return “VALUE” String. You can just return name(). charAt(0)+name().
How do I convert an enum to a string?
This code converts an enum to string: string name= Enum.GetName (typeof(ArrayListBinding.SortFilter), SortFilter.FirstName); Now let’s say, you have an enum string value say, “FirstName” and now you want to convert it to Enum value.
What are the methods in EnumSet?
Methods in EnumSet METHOD DESCRIPTION allOf (Class elementType) Creates an enum set containing all of th clone () Returns a copy of this set. complementOf (EnumSet s) Creates an enum set with the same elemen copyOf (Collection c) Creates an enum set initialized from the
Should I use EnumSet or set for enum values?
As a rule of thumb, EnumSet should always be preferred over any other Set implementation when we are storing enum values. In the next sections, we’ll see what makes this collection better than others.
What is EnumSet range in Java?
EnumSet range (E from, E to): Creates an enum set initially containing all of the elements in the range defined by the two specified endpoints. EnumSet copyof (): The method is used to copy all of the contents from a collection to a new enum set.