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java.lang
Class Enum<E extends
Enum
<E>>
java.lang.Object
java.lang.Enum<E>
-
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.
-
Since:
-
1.5
-
See Also:
-
Serialized Form
Constructor Summary
|
protected |
Enum
(
String
name, int ordinal)
Sole constructor. |
Method Summary
|
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
|
valueOf
(
Class
<T> enumType,
String
name)
Returns the enum constant of the specified enum type with the specified name. |
Enum
protected Enum(String name,
int ordinal)
-
Sole constructor. Programmers cannot invoke this constructor. It is for use by code emitted by the compiler in response to enum type declarations.
-
Parameters:
-
name - - The name of this enum constant, which is the identifier used to declare it.
-
ordinal - - The ordinal of this enumeration constant (its position in the enum declaration, where the initial constant is assigned an ordinal of zero).
name
public final String name()
-
Returns the name of this enum constant, exactly as declared in its enum declaration.
Most programmers should use the
toString()
method in preference to this one, as the toString method may return a more user-friendly name.
This method is designed primarily for use in specialized situations where correctness depends on getting the exact name, which will not vary from release to release.
-
-
-
Returns:
-
the name of this enum constant
ordinal
public final 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). Most programmers will have no use for this method. It is designed for use by sophisticated enum-based data structures, such as
EnumSet
and
EnumMap
.
-
-
-
Returns:
-
the ordinal of this enumeration constant
toString
public String toString()
-
Returns the name of this enum constant, as contained in the declaration. This method may be overridden, though it typically isn't necessary or desirable. An enum type should override this method when a more "programmer-friendly" string form exists.
-
-
Overrides:
-
toString
in class
Object
-
-
Returns:
-
the name of this enum constant
equals
public final boolean equals(Object other)
-
Returns true if the specified object is equal to this enum constant.
-
-
Overrides:
-
equals
in class
Object
-
-
Parameters:
-
other - the object to be compared for equality with this object.
-
Returns:
-
true if the specified object is equal to this enum constant.
-
See Also:
-
Object.hashCode()
,
Hashtable
hashCode
public final int hashCode()
-
Returns a hash code for this enum constant.
-
-
Overrides:
-
hashCode
in class
Object
-
-
Returns:
-
a hash code for this enum constant.
-
See Also:
-
Object.equals(java.lang.Object)
,
Hashtable
clone
protected final Object clone()
throws CloneNotSupportedException
-
Throws CloneNotSupportedException. This guarantees that enums are never cloned, which is necessary to preserve their "singleton" status.
-
-
Overrides:
-
clone
in class
Object
-
-
Returns:
-
(never returns)
-
Throws:
-
CloneNotSupportedException
- if the object's class does not support the Cloneable interface. Subclasses that override the clone method can also throw this exception to indicate that an instance cannot be cloned.
-
See Also:
-
Cloneable
compareTo
public final int compareTo(E o)
-
Compares this enum with the specified object for order. Returns a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object. Enum constants are only comparable to other enum constants of the same enum type. The natural order implemented by this method is the order in which the constants are declared.
-
-
Specified by:
-
compareTo
in interface
Comparable
<
E
extends
Enum
<
E
>>
-
-
Parameters:
-
o - the
object
Object
to be compared. -
Returns:
-
a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object.
getDeclaringClass
public final Class<E> getDeclaringClass()
-
Returns the Class object corresponding to this enum constant's enum type. Two enum constants e1 and e2 are of the same enum type if and only if e1.getDeclaringClass() == e2.getDeclaringClass(). (The value returned by this method may differ from the one returned by the
Object.getClass()
method for enum constants with constant-specific class bodies.)
-
-
-
Returns:
-
the Class object corresponding to this enum constant's enum type
valueOf
public 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. The name must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
-
-
-
Parameters:
-
enumType - the
Class
object of the enum type from which to return a constant
-
name - the name of the constant to return
-
Returns:
-
the enum constant of the specified enum type with the specified name
-
Throws:
-
IllegalArgumentException
- if the specified enum type has no constant with the specified name, or the specified class object does not represent an enum type
-
NullPointerException
- if
enumType
or
name
is null
-
Since:
-
1.5
finalize
protected final void
finalize
()
-
enum classes cannot have finalize methods.
-
-
Overrides:
-
finalize
in class
Object
-