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Class Method

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

All Implemented Interfaces:
AnnotatedElement,GenericDeclaration,Member
```
public final classMethodextendsExecutable
```
AMethod provides information about, and access to, a single method on a class or interface. The reflected method may be a class method or an instance method (including an abstract method).
AMethod permits widening conversions to occur when matching the actual parameters to invoke with the underlying method's formal parameters, but it throws anIllegalArgumentException if a narrowing conversion would occur.
Since:
1.1
See Also:
Member,Class,Class.getMethods(),Class.getMethod(String, Class[]),Class.getDeclaredMethods(),Class.getDeclaredMethod(String, Class[])

Field Summary
- Fields declared in interface java.lang.reflect.Member
  DECLARED,PUBLIC

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`equals(Object obj)`	Compares this`Method` against the specified object.
`AnnotatedType`	`getAnnotatedReturnType()`	Returns an`AnnotatedType` object that represents the use of a type to specify the return type of the method/constructor represented by this Executable.
`<T extendsAnnotation> T`	`getAnnotation(Class<T> annotationClass)`	Returns this element's annotation for the specified type if such an annotation ispresent, else null.
`Annotation[]`	`getDeclaredAnnotations()`	Returns annotations that aredirectly present on this element.
`Class<?>`	`getDeclaringClass()`	Returns the`Class` object representing the class or interface that declares the method represented by this object.
`Object`	`getDefaultValue()`	Returns the default value for the annotation member represented by this`Method` instance.
`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.
`Type`	`getGenericReturnType()`	Returns a`Type` object that represents the formal return type of the method represented by this`Method` object.
`String`	`getName()`	Returns the name of the method represented by this`Method` object, as a`String`.
`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.
`Class<?>`	`getReturnType()`	Returns a`Class` object that represents the formal return type of the method represented by this`Method` object.
`TypeVariable<Method>[]`	`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.
`int`	`hashCode()`	Returns a hashcode for this`Method`.
`Object`	`invoke(Object obj,Object... args)`	Invokes the underlying method represented by this`Method` object, on the specified object with the specified parameters.
`boolean`	`isBridge()`	Returns`true` if this method is a bridge method; returns`false` otherwise.
`boolean`	`isDefault()`	Returns`true` if this method is a default method; returns`false` otherwise.
`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.
`void`	`setAccessible(boolean flag)`	Set the`accessible` flag for this reflected object to the indicated boolean value.
`String`	`toGenericString()`	Returns a string describing this`Method`, including type parameters.
`String`	`toString()`	Returns a string describing this`Method`.

Methods declared in class java.lang.reflect.Executable
getAnnotatedExceptionTypes,getAnnotatedParameterTypes,getAnnotatedReceiverType,getAnnotationsByType,getExceptionTypes,getModifiers,getParameters,getParameterTypes

Methods declared in class java.lang.reflect.AccessibleObject
canAccess,getAnnotations,getDeclaredAnnotation,getDeclaredAnnotationsByType,isAccessible,isAnnotationPresent,setAccessible,trySetAccessible

Methods declared in class java.lang.Object
clone,finalize,getClass,notify,notifyAll,wait,wait,wait

Methods declared in interface java.lang.reflect.AnnotatedElement
getAnnotations,getDeclaredAnnotation,getDeclaredAnnotationsByType,isAnnotationPresent

- Method Detail
  - setAccessible
```
public void setAccessible(boolean flag)
```
    Description copied from class: AccessibleObject
    Set theaccessible flag for this reflected object to the indicated boolean value. A value oftrue indicates that the reflected object should suppress checks for Java language access control when it is used. A value offalse indicates that the reflected object should enforce checks for Java language access control when it is used, with the variation noted in the class description.
    This method may be used by a caller in classC to enable access to amember ofdeclaring classD if any of the following hold:
    C andD are in the same module.
    The member ispublic andD ispublic in a package that the module containingDexports to at least the module containingC.
    The member isprotectedstatic,D ispublic in a package that the module containingD exports to at least the module containingC, andC is a subclass ofD.
    D is in a package that the module containingDopens to at least the module containingC. All packages in unnamed and open modules are open to all modules and so this method always succeeds whenD is in an unnamed or open module.
    This method cannot be used to enable access to private members, members with default (package) access, protected instance members, or protected constructors when the declaring class is in a different module to the caller and the package containing the declaring class is not open to the caller's module.
    If there is a security manager, itscheckPermission method is first called with aReflectPermission("suppressAccessChecks") permission.
    Overrides:
    setAccessible in class AccessibleObject
    Parameters:
    flag - the new value for theaccessible flag
    Throws:
    InaccessibleObjectException - if access cannot be enabled
    SecurityException - if the request is denied by the security manager
    See Also:
    AccessibleObject.trySetAccessible(),MethodHandles.privateLookupIn(java.lang.Class<?>, java.lang.invoke.MethodHandles.Lookup)
  - getDeclaringClass
```
public Class<?> getDeclaringClass()
```
    Returns theClass object representing the class or interface that declares the method represented by this object.
    Specified by:
    getDeclaringClass in interface Member
    Specified by:
    getDeclaringClass in class Executable
    Returns:
    an object representing the declaring class of the underlying member
  - getName
```
public String getName()
```
    Returns the name of the method represented by thisMethod object, as aString.
    Specified by:
    getName in interface Member
    Specified by:
    getName in class Executable
    Returns:
    the simple name of the underlying member
  - getTypeParameters
```
public TypeVariable<Method>[] getTypeParameters()
```
    Returns an array ofTypeVariable objects that represent the type variables declared by the generic declaration represented by thisGenericDeclaration object, in declaration order. Returns an array of length 0 if the underlying generic declaration declares no type variables.
    Specified by:
    getTypeParameters in interface GenericDeclaration
    Specified by:
    getTypeParameters in class Executable
    Returns:
    an array ofTypeVariable objects that represent the type variables declared by this generic declaration
    Throws:
    GenericSignatureFormatError - if the generic signature of this generic declaration does not conform to the format specified inThe Java™ Virtual Machine Specification
    Since:
    1.5
  - getReturnType
```
public Class<?> getReturnType()
```
    Returns aClass object that represents the formal return type of the method represented by thisMethod object.
    Returns:
    the return type for the method this object represents
  - getGenericReturnType
```
public Type getGenericReturnType()
```
    Returns aType object that represents the formal return type of the method represented by thisMethod object.
    If the return type is a parameterized type, theType object returned must accurately reflect the actual type parameters used in the source code.
    If the return type is a type variable or a parameterized type, it is created. Otherwise, it is resolved.
    Returns:
    aType object that represents the formal return type of the underlying method
    Throws:
    GenericSignatureFormatError - if the generic method signature does not conform to the format specified inThe Java™ Virtual Machine Specification
    TypeNotPresentException - if the underlying method's return type refers to a non-existent type declaration
    MalformedParameterizedTypeException - if the underlying method's return typed refers to a parameterized type that cannot be instantiated for any reason
    Since:
    1.5
  - 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.
    Overrides:
    getParameterCount in class Executable
    Returns:
    The number of formal parameters for the executable this object represents
    Since:
    1.8
  - getGenericParameterTypes
```
public Type[] getGenericParameterTypes()
```
    Returns an array ofType 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, theType 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.
    Overrides:
    getGenericParameterTypes in class Executable
    Returns:
    an array ofTypes that represent the formal parameter types of the underlying executable, in declaration order
    Throws:
    GenericSignatureFormatError - if the generic method signature does not conform to the format specified inThe 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
    Since:
    1.5
  - getGenericExceptionTypes
```
public Type[] getGenericExceptionTypes()
```
    Returns an array ofType 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 itsthrows clause.
    If an exception type is a type variable or a parameterized type, it is created. Otherwise, it is resolved.
    Overrides:
    getGenericExceptionTypes in class Executable
    Returns:
    an array of Types that represent the exception types thrown by the underlying executable
    Throws:
    GenericSignatureFormatError - if the generic method signature does not conform to the format specified inThe Java™ Virtual Machine Specification
    TypeNotPresentException - if the underlying executable'sthrows clause refers to a non-existent type declaration
    MalformedParameterizedTypeException - if the underlying executable'sthrows clause refers to a parameterized type that cannot be instantiated for any reason
    Since:
    1.5
  - equals
```
public boolean equals(Object obj)
```
    Compares thisMethod against the specified object. Returns true if the objects are the same. TwoMethods are the same if they were declared by the same class and have the same name and formal parameter types and return type.
    Overrides:
    equals in class Object
    Parameters:
    obj - the reference object with which to compare.
    Returns:
    true if this object is the same as the obj argument;false otherwise.
    See Also:
    Object.hashCode(),HashMap
  - hashCode
```
public int hashCode()
```
    Returns a hashcode for thisMethod. The hashcode is computed as the exclusive-or of the hashcodes for the underlying method's declaring class name and the method's name.
    Overrides:
    hashCode in class Object
    Returns:
    a hash code value for this object.
    See Also:
    Object.equals(java.lang.Object),System.identityHashCode(java.lang.Object)
  - toString
```
public String toString()
```
    Returns a string describing thisMethod. The string is formatted as the method access modifiers, if any, followed by the method return type, followed by a space, followed by the class declaring the method, followed by a period, followed by the method name, followed by a parenthesized, comma-separated list of the method's formal parameter types. If the method throws checked exceptions, the parameter list is followed by a space, followed by the word "throws" followed by a comma-separated list of the thrown exception types. For example:
    public boolean java.lang.Object.equals(java.lang.Object)
    The access modifiers are placed in canonical order as specified by "The Java Language Specification". This ispublic,protected orprivate first, and then other modifiers in the following order:abstract,default,static,final,synchronized,native,strictfp.
    Overrides:
    toString in class Object
    Returns:
    a string describing thisMethod
    SeeThe Java™ Language Specification:
    8.4.3 Method Modifiers, 9.4 Method Declarations, 9.6.1 Annotation Type Elements
  - toGenericString
```
public String toGenericString()
```
    Returns a string describing thisMethod, including type parameters. The string is formatted as the method access modifiers, if any, followed by an angle-bracketed comma-separated list of the method's type parameters, if any, followed by the method's generic return type, followed by a space, followed by the class declaring the method, followed by a period, followed by the method name, followed by a parenthesized, comma-separated list of the method's generic formal parameter types. If this method was declared to take a variable number of arguments, instead of denoting the last parameter as "Type[]", it is denoted as "Type...". A space is used to separate access modifiers from one another and from the type parameters or return type. If there are no type parameters, the type parameter list is elided; if the type parameter list is present, a space separates the list from the class name. If the method is declared to throw exceptions, the parameter list is followed by a space, followed by the word "throws" followed by a comma-separated list of the generic thrown exception types.
    The access modifiers are placed in canonical order as specified by "The Java Language Specification". This ispublic,protected orprivate first, and then other modifiers in the following order:abstract,default,static,final,synchronized,native,strictfp.
    Specified by:
    toGenericString in class Executable
    Returns:
    a string describing thisMethod, include type parameters
    Since:
    1.5
    SeeThe Java™ Language Specification:
    8.4.3 Method Modifiers, 9.4 Method Declarations, 9.6.1 Annotation Type Elements
  - invoke
```
public Object invoke(Object obj,Object... args)              throwsIllegalAccessException,IllegalArgumentException,InvocationTargetException
```
    Invokes the underlying method represented by thisMethod object, on the specified object with the specified parameters. Individual parameters are automatically unwrapped to match primitive formal parameters, and both primitive and reference parameters are subject to method invocation conversions as necessary.
    If the underlying method is static, then the specifiedobj argument is ignored. It may be null.
    If the number of formal parameters required by the underlying method is 0, the suppliedargs array may be of length 0 or null.
    If the underlying method is an instance method, it is invoked using dynamic method lookup as documented in The Java Language Specification, section 15.12.4.4; in particular, overriding based on the runtime type of the target object may occur.
    If the underlying method is static, the class that declared the method is initialized if it has not already been initialized.
    If the method completes normally, the value it returns is returned to the caller of invoke; if the value has a primitive type, it is first appropriately wrapped in an object. However, if the value has the type of an array of a primitive type, the elements of the array arenot wrapped in objects; in other words, an array of primitive type is returned. If the underlying method return type is void, the invocation returns null.
    Parameters:
    obj - the object the underlying method is invoked from
    args - the arguments used for the method call
    Returns:
    the result of dispatching the method represented by this object onobj with parametersargs
    Throws:
    IllegalAccessException - if thisMethod object is enforcing Java language access control and the underlying method is inaccessible.
    IllegalArgumentException - if the method is an instance method and the specified object argument is not an instance of the class or interface declaring the underlying method (or of a subclass or implementor thereof); if the number of actual and formal parameters differ; if an unwrapping conversion for primitive arguments fails; or if, after possible unwrapping, a parameter value cannot be converted to the corresponding formal parameter type by a method invocation conversion.
    InvocationTargetException - if the underlying method throws an exception.
    NullPointerException - if the specified object is null and the method is an instance method.
    ExceptionInInitializerError - if the initialization provoked by this method fails.
  - isBridge
```
public boolean isBridge()
```
    Returnstrue if this method is a bridge method; returnsfalse otherwise.
    Returns:
    true if and only if this method is a bridge method as defined by the Java Language Specification.
    Since:
    1.5
  - isVarArgs
```
public boolean isVarArgs()
```
    Returnstrue if this executable was declared to take a variable number of arguments; returnsfalse otherwise.
    Overrides:
    isVarArgs in class Executable
    Returns:
    true if an only if this executable was declared to take a variable number of arguments.
    Since:
    1.5
  - isSynthetic
```
public boolean isSynthetic()
```
    Returnstrue if this executable is a synthetic construct; returnsfalse otherwise.
    Specified by:
    isSynthetic in interface Member
    Overrides:
    isSynthetic in class Executable
    Returns:
    true if and only if this executable is a synthetic construct as defined byThe Java™ Language Specification.
    Since:
    1.5
    SeeThe Java™ Language Specification:
    13.1 The Form of a Binary
  - isDefault
```
public boolean isDefault()
```
    Returnstrue if this method is a default method; returnsfalse otherwise. A default method is a public non-abstract instance method, that is, a non-static method with a body, declared in an interface type.
    Returns:
    true if and only if this method is a default method as defined by the Java Language Specification.
    Since:
    1.8
  - getDefaultValue
```
public Object getDefaultValue()
```
    Returns the default value for the annotation member represented by thisMethod instance. If the member is of a primitive type, an instance of the corresponding wrapper type is returned. Returns null if no default is associated with the member, or if the method instance does not represent a declared member of an annotation type.
    Returns:
    the default value for the annotation member represented by thisMethod instance.
    Throws:
    TypeNotPresentException - if the annotation is of typeClass and no definition can be found for the default class value.
    Since:
    1.5
  - getAnnotation
```
public <T extendsAnnotation> T getAnnotation(Class<T> annotationClass)
```
    Returns this element's annotation for the specified type if such an annotation ispresent, else null.
    Specified by:
    getAnnotation in interface AnnotatedElement
    Overrides:
    getAnnotation in class Executable
    Type Parameters:
    T - the type of the annotation to query for and return if present
    Parameters:
    annotationClass - the Class object corresponding to the annotation type
    Returns:
    this element's annotation for the specified annotation type if present on this element, else null
    Throws:
    NullPointerException - if the given annotation class is null
    Since:
    1.5
  - getDeclaredAnnotations
```
public Annotation[] getDeclaredAnnotations()
```
    Returns annotations that aredirectly present on this element. This method ignores inherited annotations. If there are no annotationsdirectly 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.
    Specified by:
    getDeclaredAnnotations in interface AnnotatedElement
    Overrides:
    getDeclaredAnnotations in class AccessibleObject
    Returns:
    annotations directly present on this element
    Since:
    1.5
  - getParameterAnnotations
```
public Annotation[][] getParameterAnnotations()
```
    Returns an array of arrays ofAnnotations that represent the annotations on the formal parameters, in declaration order, of theExecutable 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 theExecutable 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. SeeParameter for more information.
    Specified by:
    getParameterAnnotations in class Executable
    Returns:
    an array of arrays that represent the annotations on the formal and implicit parameters, in declaration order, of the executable represented by this object
    Since:
    1.5
    See Also:
    Parameter,AnnotatedElement.getAnnotations()
  - getAnnotatedReturnType
```
public AnnotatedType getAnnotatedReturnType()
```
    Returns anAnnotatedType object that represents the use of a type to specify the return type of the method/constructor represented by this Executable. If thisExecutable object represents a constructor, the AnnotatedType object represents the type of the constructed object. If thisExecutable object represents a method, the AnnotatedType object represents the use of a type to specify the return type of the method.
    Specified by:
    getAnnotatedReturnType in class Executable
    Returns:
    an object representing the return type of the method or constructor represented by thisExecutable
    Since:
    1.8

Movatterモバイル変換

Class Method

Field Summary

Fields declared in interface java.lang.reflect.Member

Method Summary

Methods declared in class java.lang.reflect.Executable

Methods declared in class java.lang.reflect.AccessibleObject

Methods declared in class java.lang.Object

Methods declared in interface java.lang.reflect.AnnotatedElement

Method Detail

setAccessible

getDeclaringClass

getName

getTypeParameters

getReturnType

getGenericReturnType

getParameterCount

getGenericParameterTypes

getGenericExceptionTypes

equals

hashCode

toString

toGenericString

invoke

isBridge

isVarArgs

isSynthetic

isDefault

getDefaultValue

getAnnotation

getDeclaredAnnotations

getParameterAnnotations

getAnnotatedReturnType