Executable

java.lang.Object
- java.lang.reflect.AccessibleObject
- - java.lang.reflect.Executable

所有已实现的接口:

AnnotatedElement, GenericDeclaration, Member

直接已知子类:

Constructor, Method
```
public abstract class Executable
extends AccessibleObject
implements Member, GenericDeclaration
```
A shared superclass for the common functionality of Method and Constructor.

从以下版本开始:

1.8

字段概要
- 从接口继承的字段 java.lang.reflect.Member
  DECLARED, PUBLIC

方法概要

所有方法实例方法抽象方法具体方法
限定符和类型	方法	说明
`<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.
`<T extends Annotation> T[]`	`getAnnotationsByType(Class<T> annotationClass)`	Returns annotations that are associated with this element.
`Annotation[]`	`getDeclaredAnnotations()`	Returns annotations that are directly present on this element.
`abstract Class<?>`	`getDeclaringClass()`	Returns the `Class` object representing the class or interface that declares the executable represented by this object.
`abstract Class<?>[]`	`getExceptionTypes()`	Returns an array of `Class` objects that represent the types of exceptions declared to be thrown by the underlying executable represented by this object.
`Type[]`	`getGenericExceptionTypes()`	Returns an array of `Type` objects that represent the exceptions declared to be thrown by this executable object.
`Type[]`	`getGenericParameterTypes()`	Returns an array of `Type` objects that represent the formal parameter types, in declaration order, of the executable represented by this object.
`abstract int`	`getModifiers()`	Returns the Java language Modifier for the executable represented by this object.
`abstract String`	`getName()`	Returns the name of the executable represented by this object.
`abstract Annotation[][]`	`getParameterAnnotations()`	Returns an array of arrays of `Annotation`s that represent the annotations on the formal parameters, in declaration order, of the `Executable` represented by this object.
`int`	`getParameterCount()`	Returns the number of formal parameters (whether explicitly declared or implicitly declared or neither) for the executable represented by this object.
`Parameter[]`	`getParameters()`	Returns an array of `Parameter` objects that represent all the parameters to the underlying executable represented by this object.
`abstract Class<?>[]`	`getParameterTypes()`	Returns an array of `Class` objects that represent the formal parameter types, in declaration order, of the executable represented by this object.
`abstract TypeVariable<?>[]`	`getTypeParameters()`	Returns an array of `TypeVariable` objects that represent the type variables declared by the generic declaration represented by this `GenericDeclaration` object, in declaration order.
`boolean`	`isSynthetic()`	Returns `true` if this executable is a synthetic construct; returns `false` otherwise.
`boolean`	`isVarArgs()`	Returns `true` if this executable was declared to take a variable number of arguments; returns `false` otherwise.
`abstract String`	`toGenericString()`	Returns a string describing this `Executable`, including any type parameters.

从类继承的方法 java.lang.reflect.AccessibleObject
getAnnotations, getDeclaredAnnotation, getDeclaredAnnotationsByType, isAccessible, isAnnotationPresent, setAccessible, setAccessible

从接口继承的方法 java.lang.reflect.AnnotatedElement
getAnnotations, getDeclaredAnnotation, getDeclaredAnnotationsByType, isAnnotationPresent

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

- 方法详细资料
  - getDeclaringClass
```
public abstract Class<?> getDeclaringClass()
```
    Returns the Class object representing the class or interface that declares the executable represented by this object.
    
    指定者:
    
    getDeclaringClass 在接口中 Member
    
    返回:
    
    an object representing the declaring class of the underlying member
  - getName
```
public abstract String getName()
```
    Returns the name of the executable represented by this object.
    
    指定者:
    
    getName 在接口中 Member
    
    返回:
    
    the simple name of the underlying member
  - getModifiers
```
public abstract int getModifiers()
```
    Returns the Java language Modifier for the executable represented by this object.
    
    指定者:
    
    getModifiers 在接口中 Member
    
    返回:
    
    the Java language modifiers for the underlying member
    
    另请参阅:
    
    Modifier
  - getTypeParameters
```
public abstract TypeVariable<?>[] getTypeParameters()
```
    Returns an array of TypeVariable objects that represent the type variables declared by the generic declaration represented by this GenericDeclaration object, in declaration order. Returns an array of length 0 if the underlying generic declaration declares no type variables.
    
    指定者:
    
    getTypeParameters 在接口中 GenericDeclaration
    
    返回:
    
    an array of TypeVariable objects that represent the type variables declared by this generic declaration
    
    抛出:
    
    GenericSignatureFormatError - if the generic signature of this generic declaration does not conform to the format specified in The Java™ Virtual Machine Specification
  - getParameterTypes
```
public abstract Class<?>[] getParameterTypes()
```
    Returns an array of Class objects that represent the formal parameter types, in declaration order, of the executable represented by this object. Returns an array of length 0 if the underlying executable takes no parameters.
    
    返回:
    
    the parameter types for the executable this object represents
  - getParameterCount
```
public int getParameterCount()
```
    Returns the number of formal parameters (whether explicitly declared or implicitly declared or neither) for the executable represented by this object.
    
    返回:
    
    The number of formal parameters for the executable this object represents
  - getGenericParameterTypes
```
public Type[] getGenericParameterTypes()
```
    Returns an array of Type objects that represent the formal parameter types, in declaration order, of the executable represented by this object. Returns an array of length 0 if the underlying executable takes no parameters.
    If a formal parameter type is a parameterized type, the Type object returned for it must accurately reflect the actual type parameters used in the source code.
    If a formal parameter type is a type variable or a parameterized type, it is created. Otherwise, it is resolved.
    
    返回:
    
    an array of Types that represent the formal parameter types of the underlying executable, in declaration order
    
    抛出:
    
    GenericSignatureFormatError - if the generic method signature does not conform to the format specified in The Java™ Virtual Machine Specification
    
    TypeNotPresentException - if any of the parameter types of the underlying executable refers to a non-existent type declaration
    
    MalformedParameterizedTypeException - if any of the underlying executable's parameter types refer to a parameterized type that cannot be instantiated for any reason
  - getParameters
```
public Parameter[] getParameters()
```
    Returns an array of Parameter objects that represent all the parameters to the underlying executable represented by this object. Returns an array of length 0 if the executable has no parameters.
    The parameters of the underlying executable do not necessarily have unique names, or names that are legal identifiers in the Java programming language (JLS 3.8).
    
    返回:
    
    an array of Parameter objects representing all the parameters to the executable this object represents.
    
    抛出:
    
    MalformedParametersException - if the class file contains a MethodParameters attribute that is improperly formatted.
  - getExceptionTypes
```
public abstract Class<?>[] getExceptionTypes()
```
    Returns an array of Class objects that represent the types of exceptions declared to be thrown by the underlying executable represented by this object. Returns an array of length 0 if the executable declares no exceptions in its throws clause.
    
    返回:
    
    the exception types declared as being thrown by the executable this object represents
  - getGenericExceptionTypes
```
public Type[] getGenericExceptionTypes()
```
    Returns an array of Type objects that represent the exceptions declared to be thrown by this executable object. Returns an array of length 0 if the underlying executable declares no exceptions in its throws clause.
    If an exception type is a type variable or a parameterized type, it is created. Otherwise, it is resolved.
    
    返回:
    
    an array of Types that represent the exception types thrown by the underlying executable
    
    抛出:
    
    GenericSignatureFormatError - if the generic method signature does not conform to the format specified in The Java™ Virtual Machine Specification
    
    TypeNotPresentException - if the underlying executable's throws clause refers to a non-existent type declaration
    
    MalformedParameterizedTypeException - if the underlying executable's throws clause refers to a parameterized type that cannot be instantiated for any reason
  - toGenericString
```
public abstract String toGenericString()
```
    Returns a string describing this Executable, including any type parameters.
    
    返回:
    
    a string describing this Executable, including any type parameters
  - isVarArgs
```
public boolean isVarArgs()
```
    Returns true if this executable was declared to take a variable number of arguments; returns false otherwise.
    
    返回:
    
    true if an only if this executable was declared to take a variable number of arguments.
  - isSynthetic
```
public boolean isSynthetic()
```
    Returns true if this executable is a synthetic construct; returns false otherwise.
    
    指定者:
    
    isSynthetic 在接口中 Member
    
    返回:
    
    true if and only if this executable is a synthetic construct as defined by The Java™ Language Specification.
  - getParameterAnnotations
```
public abstract Annotation[][] getParameterAnnotations()
```
    Returns an array of arrays of Annotations that represent the annotations on the formal parameters, in declaration order, of the Executable represented by this object. Synthetic and mandated parameters (see explanation below), such as the outer "this" parameter to an inner class constructor will be represented in the returned array. If the executable has no parameters (meaning no formal, no synthetic, and no mandated parameters), a zero-length array will be returned. If the Executable has one or more parameters, a nested array of length zero is returned for each parameter with no annotations. The annotation objects contained in the returned arrays are serializable. The caller of this method is free to modify the returned arrays; it will have no effect on the arrays returned to other callers. A compiler may add extra parameters that are implicitly declared in source ("mandated"), as well as parameters that are neither implicitly nor explicitly declared in source ("synthetic") to the parameter list for a method. See Parameter for more information.
    
    返回:
    
    an array of arrays that represent the annotations on the formal and implicit parameters, in declaration order, of the executable represented by this object
    
    另请参阅:
    
    Parameter, Parameter.getAnnotations()
  - 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
    
    覆盖:
    
    getAnnotation 在类中 AccessibleObject
    
    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
    
    覆盖:
    
    getAnnotationsByType 在类中 AccessibleObject
    
    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
    
    覆盖:
    
    getDeclaredAnnotations 在类中 AccessibleObject
    
    返回:
    
    annotations directly present on this element

类 Executable

字段概要

从接口继承的字段 java.lang.reflect.Member

方法概要

从类继承的方法 java.lang.reflect.AccessibleObject

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

getDeclaringClass

getName

getModifiers

getTypeParameters

getParameterTypes

getParameterCount

getGenericParameterTypes

getParameters

getExceptionTypes

getGenericExceptionTypes

toGenericString

isVarArgs

isSynthetic

getParameterAnnotations

getAnnotation

getAnnotationsByType

getDeclaredAnnotations