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Annotation
public
interface
Annotation
| java.lang.annotation.Annotation |
The common interface extended by all annotation types. Note that an
interface that manually extends this one does not define
an annotation type. Also note that this interface does not itself
define an annotation type.
More information about annotation types can be found in section 9.6 of
The Java™ Language Specification.
The AnnotatedElement interface discusses
compatibility concerns when evolving an annotation type from being
non-repeatable to being repeatable.
Summary
Public methods | |
|---|---|
abstract
Class<? extends Annotation>
|
annotationType()
Returns the annotation type of this annotation. |
abstract
boolean
|
equals(Object obj)
Returns true if the specified object represents an annotation that is logically equivalent to this one. |
abstract
int
|
hashCode()
Returns the hash code of this annotation, as defined below: The hash code of an annotation is the sum of the hash codes
of its members (including those with default values), as defined
below:
The hash code of an annotation member is (127 times the hash code
of the member-name as computed by The hash code of a member-value depends on its type: |
abstract
String
|
toString()
Returns a string representation of this annotation. |
Public methods
annotationType
public abstract Class<? extends Annotation> annotationType ()
Returns the annotation type of this annotation.
| Returns | |
|---|---|
Class<? extends Annotation> |
the annotation type of this annotation |
equals
public abstract boolean equals (Object obj)
Returns true if the specified object represents an annotation that is logically equivalent to this one. In other words, returns true if the specified object is an instance of the same annotation type as this instance, all of whose members are equal to the corresponding member of this annotation, as defined below:
- Two corresponding primitive typed members whose values are
xandyare considered equal ifx == y, unless their type isfloatordouble. - Two corresponding
floatmembers whose values arexandyare considered equal ifFloat.valueOf(x).equals(Float.valueOf(y)). (Unlike the==operator, NaN is considered equal to itself, and0.0funequal to-0.0f.) - Two corresponding
doublemembers whose values arexandyare considered equal ifDouble.valueOf(x).equals(Double.valueOf(y)). (Unlike the==operator, NaN is considered equal to itself, and0.0unequal to-0.0.) - Two corresponding
String,Class, enum, or annotation typed members whose values arexandyare considered equal ifx.equals(y). (Note that this definition is recursive for annotation typed members.) - Two corresponding array typed members
xandyare considered equal ifArrays.equals(x, y), for the appropriate overloading ofArrays.equals(boolean[], boolean[]).
| Parameters | |
|---|---|
obj |
Object: the reference object with which to compare. |
| Returns | |
|---|---|
boolean |
true if the specified object represents an annotation that is logically equivalent to this one, otherwise false |
hashCode
public abstract int hashCode ()
Returns the hash code of this annotation, as defined below:
The hash code of an annotation is the sum of the hash codes
of its members (including those with default values), as defined
below:
The hash code of an annotation member is (127 times the hash code
of the member-name as computed by String#hashCode()) XOR
the hash code of the member-value, as defined below:
The hash code of a member-value depends on its type:
- The hash code of a primitive value
vis equal toWrapperType.valueOf(v).hashCode(), whereWrapperTypeis the wrapper type corresponding to the primitive type ofv(Byte,Character,Double,Float,Integer,Long,Short, orBoolean). - The hash code of a string, enum, class, or annotation member-value
I
vis computed as by callingv.hashCode(). (In the case of annotation member values, this is a recursive definition.) - The hash code of an array member-value is computed by calling
the appropriate overloading of
Arrays.hashCodeon the value. (There is one overloading for each primitive type, and one for object reference types.)
| Returns | |
|---|---|
int |
the hash code of this annotation |
toString
public abstract String toString ()
Returns a string representation of this annotation. The details of the representation are implementation-dependent, but the following may be regarded as typical:
@com.acme.util.Name(first=Alfred, middle=E., last=Neuman)
| Returns | |
|---|---|
String |
a string representation of this annotation |