Parameter

java.lang.Object
- java.lang.reflect.Parameter

所有已实现的接口:

AnnotatedElement
```
public final class Parameter
extends Object
implements AnnotatedElement
```
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.

从以下版本开始:

1.8

方法概要

所有方法实例方法具体方法
限定符和类型	方法	说明
`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 according to the class file; 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.

从接口继承的方法 java.lang.reflect.AnnotatedElement
isAnnotationPresent

从类继承的方法 java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- 方法详细资料
  - equals
```
public boolean equals(Object obj)
```
    Compares based on the executable and the index.
    
    覆盖:
    
    equals 在类中 Object
    
    参数:
    
    obj - The object to compare.
    
    返回:
    
    Whether or not this is equal to the argument.
    
    另请参阅:
    
    Object.hashCode(), HashMap
  - hashCode
```
public int hashCode()
```
    Returns a hash code based on the executable's hash code and the index.
    
    覆盖:
    
    hashCode 在类中 Object
    
    返回:
    
    A hash code based on the executable's hash code.
    
    另请参阅:
    
    Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)
  - isNamePresent
```
public boolean isNamePresent()
```
    Returns true if the parameter has a name according to the class file; returns false otherwise. Whether a parameter has a name is determined by the MethodParameters attribute of the method which declares the parameter.
    
    返回:
    
    true if and only if the parameter has a name according to the class file.
  - toString
```
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.
    
    覆盖:
    
    toString 在类中 Object
    
    返回:
    
    A string representation of the parameter and associated information.
  - getDeclaringExecutable
```
public Executable getDeclaringExecutable()
```
    Return the Executable which declares this parameter.
    
    返回:
    
    The Executable declaring this parameter.
  - getModifiers
```
public int getModifiers()
```
    Get the modifier flags for this the parameter represented by this Parameter object.
    
    返回:
    
    The modifier flags for this parameter.
  - getName
```
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.
    
    返回:
    
    The name of the parameter, either provided by the class file or synthesized if the class file does not provide a name.
  - getParameterizedType
```
public Type getParameterizedType()
```
    Returns a Type object that identifies the parameterized type for the parameter represented by this Parameter object.
    
    返回:
    
    a Type object identifying the parameterized type of the parameter represented by this object
  - getType
```
public Class<?> getType()
```
    Returns a Class object that identifies the declared type for the parameter represented by this Parameter object.
    
    返回:
    
    a Class object identifying the declared type of the parameter represented by this object
  - isImplicit
```
public boolean isImplicit()
```
    Returns true if this parameter is implicitly declared in source code; returns false otherwise.
    
    返回:
    
    true if and only if this parameter is implicitly declared as defined by The Java™ Language Specification.
  - isSynthetic
```
public boolean isSynthetic()
```
    Returns true if this parameter is neither implicitly nor explicitly declared in source code; returns false otherwise.
    
    返回:
    
    true if and only if this parameter is a synthetic construct as defined by The Java™ Language Specification.
  - isVarArgs
```
public boolean isVarArgs()
```
    Returns true if this parameter represents a variable argument list; returns false otherwise.
    
    返回:
    
    true if an only if this parameter represents a variable argument list.
  - getAnnotation
```
public <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.
    
    指定者:
    
    getAnnotation 在接口中 AnnotatedElement
    
    类型参数:
    
    T - the type of the annotation to query for and return if present
    
    参数:
    
    annotationClass - the Class object corresponding to the annotation type
    
    返回:
    
    this element's annotation for the specified annotation type if present on this element, else null
    
    抛出:
    
    NullPointerException - if the given annotation class is null
  - getAnnotationsByType
```
public <T extends Annotation> 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 AnnotatedElement.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.
    
    指定者:
    
    getAnnotationsByType 在接口中 AnnotatedElement
    
    类型参数:
    
    T - the type of the annotation to query for and return if present
    
    参数:
    
    annotationClass - the Class object corresponding to the annotation type
    
    返回:
    
    all this element's annotations for the specified annotation type if associated with this element, else an array of length zero
    
    抛出:
    
    NullPointerException - if the given annotation class is null
  - getDeclaredAnnotations
```
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.
    
    指定者:
    
    getDeclaredAnnotations 在接口中 AnnotatedElement
    
    返回:
    
    annotations directly present on this element
  - getDeclaredAnnotation
```
public <T extends Annotation> T getDeclaredAnnotation(Class<T> annotationClass)
```
    从接口复制的说明: AnnotatedElement
    
    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.)
    
    指定者:
    
    getDeclaredAnnotation 在接口中 AnnotatedElement
    
    类型参数:
    
    T - the type of the annotation to query for and return if directly present
    
    参数:
    
    annotationClass - the Class object corresponding to the annotation type
    
    返回:
    
    this element's annotation for the specified annotation type if directly present on this element, else null
    
    抛出:
    
    NullPointerException - if the given annotation class is null
  - getDeclaredAnnotationsByType
```
public <T extends Annotation> T[] getDeclaredAnnotationsByType(Class<T> annotationClass)
```
    从接口复制的说明: AnnotatedElement
    
    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 AnnotatedElement.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.
    
    指定者:
    
    getDeclaredAnnotationsByType 在接口中 AnnotatedElement
    
    类型参数:
    
    T - the type of the annotation to query for and return if directly or indirectly present
    
    参数:
    
    annotationClass - the Class object corresponding to the annotation type
    
    返回:
    
    all this element's annotations for the specified annotation type if directly or indirectly present on this element, else an array of length zero
    
    抛出:
    
    NullPointerException - if the given annotation class is null
  - getAnnotations
```
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.
    
    指定者:
    
    getAnnotations 在接口中 AnnotatedElement
    
    返回:
    
    annotations present on this element

类 Parameter

方法概要

从接口继承的方法 java.lang.reflect.AnnotatedElement

从类继承的方法 java.lang.Object

方法详细资料

equals

hashCode

isNamePresent

toString

getDeclaringExecutable

getModifiers

getName

getParameterizedType

getType

isImplicit

isSynthetic

isVarArgs

getAnnotation

getAnnotationsByType

getDeclaredAnnotations

getDeclaredAnnotation

getDeclaredAnnotationsByType

getAnnotations