Parameter

public final class Parameter
extends Object implements AnnotatedElement

java.lang.Object
↳	java.lang.reflect.Parameter

Information about method parameters. A Parameter provides information about method parameters, including its name and modifiers. It also provides an alternate means of obtaining attributes for the parameter.

Summary

Public methods
`boolean`	`equals(Object obj)` Compares based on the executable and the index.
`<T extends Annotation> T`	`getAnnotation(Class<T> annotationClass)` Returns this element's annotation for the specified type if such an annotation is present, else null.
`Annotation[]`	`getAnnotations()` Returns annotations that are present on this element.
`<T extends Annotation> T[]`	`getAnnotationsByType(Class<T> annotationClass)` Returns annotations that are associated with this element.
`<T extends Annotation> T`	`getDeclaredAnnotation(Class<T> annotationClass)` Returns this element's annotation for the specified type if such an annotation is directly present, else null.
`Annotation[]`	`getDeclaredAnnotations()` Returns annotations that are directly present on this element.
`<T extends Annotation> T[]`	`getDeclaredAnnotationsByType(Class<T> annotationClass)` Returns this element's annotation(s) for the specified type if such annotations are either directly present or indirectly present.
`Executable`	`getDeclaringExecutable()` Return the `Executable` which declares this parameter.
`int`	`getModifiers()` Get the modifier flags for this the parameter represented by this `Parameter` object.
`String`	`getName()` Returns the name of the parameter.
`Type`	`getParameterizedType()` Returns a `Type` object that identifies the parameterized type for the parameter represented by this `Parameter` object.
`Class<?>`	`getType()` Returns a `Class` object that identifies the declared type for the parameter represented by this `Parameter` object.
`int`	`hashCode()` Returns a hash code based on the executable's hash code and the index.
`boolean`	`isImplicit()` Returns `true` if this parameter is implicitly declared in source code; returns `false` otherwise.
`boolean`	`isNamePresent()` Returns true if the parameter has a name; returns false otherwise.
`boolean`	`isSynthetic()` Returns `true` if this parameter is neither implicitly nor explicitly declared in source code; returns `false` otherwise.
`boolean`	`isVarArgs()` Returns `true` if this parameter represents a variable argument list; returns `false` otherwise.
`String`	`toString()` Returns a string describing this parameter.

Inherited methods

From class java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

From interface java.lang.reflect.AnnotatedElement

`abstract <T extends Annotation> T`	`getAnnotation(Class<T> annotationClass)` Returns this element's annotation for the specified type if such an annotation is present, else null.
`abstract Annotation[]`	`getAnnotations()` Returns annotations that are present on this element.
`default <T extends Annotation> T[]`	`getAnnotationsByType(Class<T> annotationClass)` Returns annotations that are associated with this element.
`default <T extends Annotation> T`	`getDeclaredAnnotation(Class<T> annotationClass)` Returns this element's annotation for the specified type if such an annotation is directly present, else null.
`abstract Annotation[]`	`getDeclaredAnnotations()` Returns annotations that are directly present on this element.
`default <T extends Annotation> T[]`	`getDeclaredAnnotationsByType(Class<T> annotationClass)` Returns this element's annotation(s) for the specified type if such annotations are either directly present or indirectly present.
`default boolean`	`isAnnotationPresent(Class<? extends Annotation> annotationClass)` Returns true if an annotation for the specified type is present on this element, else false.

Public methods

equals

Added in API level 26

 public boolean equals (Object obj)

Compares based on the executable and the index.

Parameters
`obj`	`Object`: The object to compare.

Returns
`boolean`	Whether or not this is equal to the argument.

getAnnotation

Added in API level 26

 public T getAnnotation (Class<T> annotationClass)

Returns this element's annotation for the specified type if such an annotation is present, else null.

Parameters
`annotationClass`	`Class`: the Class object corresponding to the annotation type

Returns
`T`	this element's annotation for the specified annotation type if present on this element, else null

Throws
`NullPointerException`

getAnnotations

Added in API level 26

 public Annotation[] getAnnotations ()

Returns annotations that are present on this element. If there are no annotations present on this element, the return value is an array of length 0. The caller of this method is free to modify the returned array; it will have no effect on the arrays returned to other callers.

Returns
`Annotation[]`	annotations present on this element

getAnnotationsByType

Added in API level 26

 public T[] getAnnotationsByType (Class<T> annotationClass)

Returns annotations that are associated with this element. If there are no annotations associated with this element, the return value is an array of length 0. The difference between this method and getAnnotation(java.lang.Class) is that this method detects if its argument is a repeatable annotation type (JLS 9.6), and if so, attempts to find one or more annotations of that type by "looking through" a container annotation. The caller of this method is free to modify the returned array; it will have no effect on the arrays returned to other callers.

Parameters
`annotationClass`	`Class`: the Class object corresponding to the annotation type

Returns
`T[]`	all this element's annotations for the specified annotation type if associated with this element, else an array of length zero

Throws
`NullPointerException`

getDeclaredAnnotation

Added in API level 26

 public T getDeclaredAnnotation (Class<T> annotationClass)

Returns this element's annotation for the specified type if such an annotation is directly present, else null. This method ignores inherited annotations. (Returns null if no annotations are directly present on this element.)

Parameters
`annotationClass`	`Class`: the Class object corresponding to the annotation type

Returns
`T`	this element's annotation for the specified annotation type if directly present on this element, else null

Throws
`NullPointerException`

getDeclaredAnnotations

Added in API level 26

 public Annotation[] getDeclaredAnnotations ()

Returns annotations that are directly present on this element. This method ignores inherited annotations. If there are no annotations directly present on this element, the return value is an array of length 0. The caller of this method is free to modify the returned array; it will have no effect on the arrays returned to other callers.

Returns
`Annotation[]`	annotations directly present on this element

getDeclaredAnnotationsByType

Added in API level 26

 public T[] getDeclaredAnnotationsByType (Class<T> annotationClass)

Returns this element's annotation(s) for the specified type if such annotations are either directly present or indirectly present. This method ignores inherited annotations. If there are no specified annotations directly or indirectly present on this element, the return value is an array of length 0. The difference between this method and getDeclaredAnnotation(java.lang.Class) is that this method detects if its argument is a repeatable annotation type (JLS 9.6), and if so, attempts to find one or more annotations of that type by "looking through" a container annotation if one is present. The caller of this method is free to modify the returned array; it will have no effect on the arrays returned to other callers.

Parameters
`annotationClass`	`Class`: the Class object corresponding to the annotation type

Returns
`T[]`	all this element's annotations for the specified annotation type if directly or indirectly present on this element, else an array of length zero

Throws
`NullPointerException`

getDeclaringExecutable

Added in API level 26

 public Executable getDeclaringExecutable ()

Return the Executable which declares this parameter.

Returns
`Executable`	The `Executable` declaring this parameter.

getModifiers

Added in API level 26

 public int getModifiers ()

Get the modifier flags for this the parameter represented by this Parameter object.

Returns
`int`	The modifier flags for this parameter.

getName

Added in API level 26

 public String getName ()

Returns the name of the parameter. If the parameter's name is present, then this method returns the name provided by the class file. Otherwise, this method synthesizes a name of the form argN, where N is the index of the parameter in the descriptor of the method which declares the parameter.

Returns
`String`	The name of the parameter, either provided by the class file or synthesized if the class file does not provide a name.

getParameterizedType

Added in API level 26

 public Type getParameterizedType ()

Returns a Type object that identifies the parameterized type for the parameter represented by this Parameter object.

Returns
`Type`	a `Type` object identifying the parameterized type of the parameter represented by this object

getType

Added in API level 26

 public Class<?> getType ()

Returns a Class object that identifies the declared type for the parameter represented by this Parameter object.

Returns
`Class<?>`	a `Class` object identifying the declared type of the parameter represented by this object

hashCode

Added in API level 26

 public int hashCode ()

Returns a hash code based on the executable's hash code and the index.

Returns
`int`	A hash code based on the executable's hash code.

isImplicit

Added in API level 26

 public boolean isImplicit ()

Returns true if this parameter is implicitly declared in source code; returns false otherwise.

Returns
`boolean`	true if and only if this parameter is implicitly declared as defined by The Java™ Language Specification.

isNamePresent

Added in API level 26

 public boolean isNamePresent ()

Returns true if the parameter has a name; returns false otherwise. Whether a parameter has a name is determined by compiler options and whether the parameter is synthesized.

Returns
`boolean`	true if and only if the parameter has a name

isSynthetic

Added in API level 26

 public boolean isSynthetic ()

Returns true if this parameter is neither implicitly nor explicitly declared in source code; returns false otherwise.

Returns
`boolean`	true if and only if this parameter is a synthetic construct as defined by The Java™ Language Specification.

isVarArgs

Added in API level 26

 public boolean isVarArgs ()

Returns true if this parameter represents a variable argument list; returns false otherwise.

Returns
`boolean`	`true` if an only if this parameter represents a variable argument list.

toString

Added in API level 26

 public String toString ()

Returns a string describing this parameter. The format is the modifiers for the parameter, if any, in canonical order as recommended by The Java™ Language Specification, followed by the fully- qualified type of the parameter (excluding the last [] if the parameter is variable arity), followed by "..." if the parameter is variable arity, followed by a space, followed by the name of the parameter.

Returns
`String`	A string representation of the parameter and associated information.