java.lang.Object
java.lang.reflect.AccessibleObject
java.lang.reflect.Method
public final class Method
A Method 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).
A Method permits widening conversions to occur when matching the actual parameters to invoke with the underlying method's formal parameters, but it throws an IllegalArgumentException if a narrowing conversion would occur.
Member, Class, Class.getMethods(), Class.getMethod(String, Class[]), Class.getDeclaredMethods(), Class.getDeclaredMethod(String, Class[])
boolean equals(Object obj)
Method against the specified object. <T extends Annotation>
T getAnnotation(Class<T> annotationClass)
Annotation[] getDeclaredAnnotations()
Class<?> getDeclaringClass()
Class object representing the class or interface that declares the method represented by this Method object. Object getDefaultValue()
Class<?>[] getExceptionTypes()
Class objects that represent the types of the exceptions declared to be thrown by the underlying method represented by this Method object. Type[] getGenericExceptionTypes()
Type[] getGenericParameterTypes()
Type getGenericReturnType()
int getModifiers()
Method object, as an integer. String getName()
Method object, as a String. Annotation[][] getParameterAnnotations()
Class<?>[] getParameterTypes()
Class objects that represent the formal parameter types, in declaration order, of the method represented by this Method object. Class<?> getReturnType()
Class object that represents the formal return type of the method represented by this Method object. TypeVariable<Method>[] getTypeParameters()
int hashCode()
Method. Object invoke(Object obj, Object... args)
Method object, on the specified object with the specified parameters. boolean isBridge()
boolean isSynthetic()
boolean isVarArgs()
String toGenericString()
Method, including type parameters. String toString()
Method. getDeclaringClass
public Class<?> getDeclaringClass()
Class object representing the class or interface that declares the method represented by this Method object.
getDeclaringClass in interface Member
public String getName()
Method object, as a String.
getName in interface Member
public int getModifiers()
Method object, as an integer. The Modifier class should be used to decode the modifiers.
getModifiers in interface Member
Modifier
public TypeVariable<Method>[] getTypeParameters()
getTypeParameters in interface GenericDeclaration
GenericSignatureFormatError - if the generic signature of this generic declaration does not conform to the format specified in the Java Virtual Machine Specification, 3rd edition
public Class<?> getReturnType()
Class object that represents the formal return type of the method represented by this Method object.
public Type getGenericReturnType()
If the return type is a parameterized type, the Type 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.
GenericSignatureFormatError - if the generic method signature does not conform to the format specified in the Java Virtual Machine Specification, 3rd edition
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
public Class<?>[] getParameterTypes()
Class objects that represent the formal parameter types, in declaration order, of the method represented by this Method object. Returns an array of length 0 if the underlying method takes no parameters.
public Type[] getGenericParameterTypes()
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.
GenericSignatureFormatError - if the generic method signature does not conform to the format specified in the Java Virtual Machine Specification, 3rd edition
TypeNotPresentException - if any of the parameter types of the underlying method refers to a non-existent type declaration
MalformedParameterizedTypeException - if any of the underlying method's parameter types refer to a parameterized type that cannot be instantiated for any reason
public Class<?>[] getExceptionTypes()
Class objects that represent the types of the exceptions declared to be thrown by the underlying method represented by this Method object. Returns an array of length 0 if the method declares no exceptions in its throws clause.
public Type[] getGenericExceptionTypes()
If an exception type is a parameterized type, the Type object returned for it must accurately reflect the actual type parameters used in the source code.
If an exception type is a type variable or a parameterized type, it is created. Otherwise, it is resolved.
GenericSignatureFormatError - if the generic method signature does not conform to the format specified in the Java Virtual Machine Specification, 3rd edition
TypeNotPresentException - if the underlying method's throws clause refers to a non-existent type declaration
MalformedParameterizedTypeException - if the underlying method's throws clause refers to a parameterized type that cannot be instantiated for any reason
public boolean equals(Object obj)
Method against the specified object. Returns true if the objects are the same. Two Methods are the same if they were declared by the same class and have the same name and formal parameter types and return type.
equals in class Object
obj - the reference object with which to compare.
true if this object is the same as the obj argument; false otherwise.
Object.hashCode(), Hashtable
public int hashCode()
Method. The hashcode is computed as the exclusive-or of the hashcodes for the underlying method's declaring class name and the method's name.
hashCode in class Object
Object.equals(java.lang.Object), Hashtable
public String toString()
Method. 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 is public, protected or private first, and then other modifiers in the following order: abstract, static, final, synchronized native.
toString in class Object
public String toGenericString()
Method, 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. 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. If there are no type parameters, the type parameter list is elided.
The access modifiers are placed in canonical order as specified by "The Java Language Specification". This is public, protected or private first, and then other modifiers in the following order: abstract, static, final, synchronized native.
Method, include type parameters
public Object invoke(Object obj,
Object... args)
throws IllegalAccessException,
IllegalArgumentException,
InvocationTargetException
Method 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 specified obj argument is ignored. It may be null.
If the number of formal parameters required by the underlying method is 0, the supplied args 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, Second Edition, section 15.12.4.4; in particular, overriding based on the runtime type of the target object will 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 are not 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.
obj - the object the underlying method is invoked from
args - the arguments used for the method call
obj with parameters args
IllegalAccessException - if this Method object enforces 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.
public boolean isBridge()
public boolean isVarArgs()
public boolean isSynthetic()
isSynthetic in interface Member
public <T extends Annotation> T getAnnotation(Class<T> annotationClass)
AnnotatedElement
getAnnotation in interface AnnotatedElement
getAnnotation in class AccessibleObject
annotationClass - the Class object corresponding to the annotation type
public Annotation[] getDeclaredAnnotations()
AnnotatedElement
getDeclaredAnnotations in interface AnnotatedElement
getDeclaredAnnotations in class AccessibleObject
public Object getDefaultValue()
TypeNotPresentException - if the annotation is of type Class and no definition can be found for the default class value.
public Annotation[][] getParameterAnnotations()
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