Executable

public abstract class Executable extends AccessibleObject
implements Member GenericDeclaration

Known Direct Subclasses Constructor<T>, Method Constructor<T> Constructor provides information about, and access to, a single constructor for a class.  Method A Method provides information about, and access to, a single method on a class or interface.

A shared superclass for the common functionality of Method and Constructor.

Inherited Constant Summary

From interface java.lang.reflect.Member

int	DECLARED	Identifies the set of declared members of a class or interface.
int	PUBLIC	Identifies the set of all public members of a class or interface, including inherited members.

Public Method Summary

AnnotatedType[]	getAnnotatedExceptionTypes() Returns an array of AnnotatedType objects that represent the use of types to specify the declared exceptions of the method/constructor represented by this Executable.
AnnotatedType[]	getAnnotatedParameterTypes() Returns an array of AnnotatedType objects that represent the use of types to specify formal parameter types of the method/constructor represented by this Executable.
AnnotatedType	getAnnotatedReceiverType() Returns an AnnotatedType object that represents the use of a type to specify the receiver type of the method/constructor represented by this Executable object.
abstract 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 extends Annotation> T	getAnnotation(Class<T> cls) Returns this element's annotation for the specified type if such an annotation is present, else null.
<T extends Annotation> T[]	getAnnotationsByType(Class<T> cls) 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 {@linkplain Modifier modifiers} 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 Annotations 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.
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.
Parameter[]	getParameters() Returns an array of Parameter objects that represent all the parameters to the underlying 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.

Inherited Method Summary

From class java.lang.reflect.AccessibleObject

<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.
boolean	isAccessible() Get the value of the accessible flag for this object.
boolean	isAnnotationPresent(Class<? extends Annotation> annotationClass) Returns true if an annotation for the specified type is present on this element, else false.
void	setAccessible(boolean flag) Set the accessible flag for this object to the indicated boolean value.
static void	setAccessible(AccessibleObject[] array, boolean flag) Convenience method to set the accessible flag for an array of objects with a single security check (for efficiency).

From class java.lang.Object

Object	clone() Creates and returns a copy of this Object.
boolean	equals(Object obj) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of Class that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long timeout, int nanos) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait(long timeout) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.

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.
<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.
abstract 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.
boolean	isAnnotationPresent(Class<? extends Annotation> annotationClass) Returns true if an annotation for the specified type is present on this element, else false.

From interface java.lang.reflect.Member

abstract Class<?>	getDeclaringClass() Returns the Class object representing the class or interface that declares the member or constructor represented by this Member.
abstract int	getModifiers() Returns the Java language modifiers for the member or constructor represented by this Member, as an integer.
abstract String	getName() Returns the simple name of the underlying member or constructor represented by this Member.
abstract boolean	isSynthetic() Returns true if this member was introduced by the compiler; returns false otherwise.

From interface java.lang.reflect.GenericDeclaration

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.

Public Methods

public AnnotatedType[] getAnnotatedExceptionTypes ()

Returns an array of AnnotatedType objects that represent the use of types to specify the declared exceptions of the method/constructor represented by this Executable. The order of the objects in the array corresponds to the order of the exception types in the declaration of the method/constructor. Returns an array of length 0 if the method/constructor declares no exceptions.

Returns

• an array of objects representing the declared exceptions of the method or constructor represented by this Executable

public AnnotatedType[] getAnnotatedParameterTypes ()

Returns an array of AnnotatedType objects that represent the use of types to specify formal parameter types of the method/constructor represented by this Executable. The order of the objects in the array corresponds to the order of the formal parameter types in the declaration of the method/constructor. Returns an array of length 0 if the method/constructor declares no parameters.

Returns

• an array of objects representing the types of the formal parameters of the method or constructor represented by this Executable

public AnnotatedType getAnnotatedReceiverType ()

Returns an AnnotatedType object that represents the use of a type to specify the receiver type of the method/constructor represented by this Executable object. The receiver type of a method/constructor is available only if the method/constructor has a receiver parameter (JLS 8.4.1). If this Executable object represents a constructor or instance method that does not have a receiver parameter, or has a receiver parameter with no annotations on its type, then the return value is an AnnotatedType object representing an element with no annotations. If this Executable object represents a static method, then the return value is null.

Returns

• an object representing the receiver type of the method or constructor represented by this Executable

public abstract 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. If this Executable object represents a constructor, the AnnotatedType object represents the type of the constructed object. If this Executable object represents a method, the AnnotatedType object represents the use of a type to specify the return type of the method.

Returns

• an object representing the return type of the method or constructor represented by this Executable

public T getAnnotation (Class<T> cls)

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

Parameters

cls	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

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

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(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

cls	the Class object corresponding to the annotation type

Returns

• all this element's annotations for the specified annotation type if associated with this element, else an array of length zero

Throws

NullPointerException

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

• annotations directly present on this element

public abstract Class<?> getDeclaringClass ()

Returns the Class object representing the class or interface that declares the executable represented by this object.

Returns

• an object representing the declaring class of the underlying member

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.

Returns

• the exception types declared as being thrown by the executable this object represents

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.

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 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

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.

Returns

• an array of Types 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 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

public abstract int getModifiers ()

Returns the Java language {@linkplain Modifier modifiers} for the executable represented by this object.

Returns

• the Java language modifiers for the underlying member

public abstract String getName ()

Returns the name of the executable represented by this object.

Returns

• the simple name of the underlying member

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.

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

See Also

• Parameter
• Parameter.getAnnotations()

public int getParameterCount ()

Returns the number of formal parameters (whether explicitly declared or implicitly declared or neither) for the executable represented by this object.

Returns

• The number of formal parameters for the executable this object represents

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.

Returns

• the parameter types for the executable this object represents

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).

Returns

• an array of Parameter objects representing all the parameters to the executable this object represents.

Throws

	if the class file contains a MethodParameters attribute that is improperly formatted.

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.

Returns

• an array of TypeVariable 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 in The Java™ Virtual Machine Specification

public boolean isSynthetic ()

Returns true if this executable is a synthetic construct; returns false otherwise.

Returns

• true if and only if this executable is a synthetic construct as defined by The Java™ Language Specification.

public boolean isVarArgs ()

Returns true if this executable was declared to take a variable number of arguments; returns false otherwise.

Returns

• true if an only if this executable was declared to take a variable number of arguments.

public abstract String toGenericString ()

Returns a string describing this Executable, including any type parameters.

Returns

• a string describing this Executable, including any type parameters