[JAVA API] java.lang.Enum<E>, 열거형

enum 사용 예제

class Ex112_Enumeration 
{
	public static void main(String[] args)
	{
		//Ex112_Enumeration
		MyColor c1;

		c1 = MyColor.red;	//public static final 변수 -> 상수

		System.out.println(c1);
		
//		MyColor c2 = MyColor.white;	// 컴파일 불가.

		MyColor c3 = MyColor2.YELLOW;
	}
}

//열거형 선언
enum MyColor { red, blue, yellow, green, black }	//가능하나 비추
enum MyColor2 { RED, BLUE, YELLOW, GREEN, BLACK }	//상수라 이걸 권장

 

 

java.lang

Class Enum<E extends Enum<E>>

• java.lang.Object
• • java.lang.Enum<E>

• Type Parameters:

  E - The enum type subclass

  All Implemented Interfaces:

  Serializable, Comparable<E>

  ---

  
  

  public abstract class Enum<E extends Enum<E>>
  extends Object
  implements Comparable<E>, Serializable

  This is the common base class of all Java language enumeration types. More information about enums, including descriptions of the implicitly declared methods synthesized by the compiler, can be found in section 8.9 of The Java™ Language Specification.

  Note that when using an enumeration type as the type of a set or as the type of the keys in a map, specialized and efficient set and map implementations are available.

  Since:

  1.5

  See Also:

  Class.getEnumConstants(), EnumSet, EnumMap, Serialized Form

• Constructor Summary

  Constructors 

  Modifier	Constructor and Description
  protected	Enum(String name, int ordinal) Sole constructor.

• Method Summary

  Methods 

  Modifier and Type	Method and Description
  protected Object	clone() Throws CloneNotSupportedException.
  int	compareTo(E o) Compares this enum with the specified object for order.
  boolean	equals(Object other) Returns true if the specified object is equal to this enum constant.
  protected void	finalize() enum classes cannot have finalize methods.
  Class<E>	getDeclaringClass() Returns the Class object corresponding to this enum constant's enum type.
  int	hashCode() Returns a hash code for this enum constant.
  String	name() Returns the name of this enum constant, exactly as declared in its enum declaration.
  int	ordinal() Returns the ordinal of this enumeration constant (its position in its enum declaration, where the initial constant is assigned an ordinal of zero).
  String	toString() Returns the name of this enum constant, as contained in the declaration.
  static <T extends Enum<T>>  T	valueOf(Class<T> enumType, String name) Returns the enum constant of the specified enum type with the specified name.

• Methods inherited from class java.lang.Object

  getClass, notify, notifyAll, wait, wait, wait