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java.lang.reflect
Class
Constructor<T>
Constructor
java.lang.Object
java.lang.reflect.AccessibleObject
java.lang.reflect.Constructor
-
All Implemented Interfaces:
-
AnnotatedElement
Member
,
GenericDeclaration
,
Member
-
public final class
Constructor<T>
Constructor
-
extends
AccessibleObject
-
implements
GenericDeclaration
Member
,
Member
Constructor provides information about, and access to, a single constructor for a class.
Constructor permits widening conversions to occur when matching the actual parameters to newInstance() with the underlying constructor's formal parameters, but throws an IllegalArgumentException if a narrowing conversion would occur.
-
See Also:
-
Member
,
Class
,
Class.getConstructors()
,
Class.getConstructor(Class[])
Class.getConstructor(Class[])
,
Class.getDeclaredConstructors()
Method Summary
|
boolean |
equals
(
Object
obj)
Compares this Constructor against the specified object. |
<T extends java.lang.annotation.Annotation>
T
|
Class
|
getDeclaringClass
()
Returns the Class object representing the class that declares the constructor represented by this Constructor object.
|
|
getAnnotation
(
Class
<T> annotationClass)
Returns this element's annotation for the specified type if such an annotation is present, else null.
|
java.lang.annotation.Annotation[]
|
getDeclaredAnnotations
()
Returns all annotations that are directly present on this element.
|
Class
<
T
|
getDeclaringClass
()
Returns the Class object representing the class that declares the constructor represented by this Constructor object.
|
Class
[] |
getExceptionTypes
()
Returns an array of Class objects that represent the types of of exceptions declared to be thrown by the underlying constructor represented by this Constructor object. |
Type
|
getGenericExceptionTypes
()
Returns an array of
Type
objects that represent the exceptions declared to be thrown by this
Constructor
object.
|
Type
|
getGenericParameterTypes
()
Returns an array of
Type
objects that represent the formal parameter types, in declaration order, of the method represented by this
Constructor
object.
|
int |
getModifiers
()
Returns the Java language modifiers for the constructor represented by this Constructor object, as an integer. |
String
|
getName
()
Returns the name of this constructor, as a string. |
java.lang.annotation.Annotation[][]
|
getParameterAnnotations
()
Returns an array of arrays that represent the annotations on the formal parameters, in declaration order, of the method represented by this Method object.
|
Class
[] |
getParameterTypes
()
Returns an array of Class objects that represent the formal parameter types, in declaration order, of the constructor represented by this Constructor object. |
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.
|
int |
hashCode
()
Returns a hashcode for this Constructor. |
boolean
|
isSynthetic
()
Returns
true
if this constructor is a synthetic constructor; returns
false
otherwise.
|
Object
|
newInstance
(
Object
Uses the constructor represented by this Constructor object to create and initialize a new instance of the constructor's declaring class, with the specified initialization parameters.
|
boolean
|
isVarArgs
()
Returns
true
if this constructor was declared to take a variable number of arguments; returns
false
otherwise.
|
T
|
newInstance
(
Object
Uses the constructor represented by this Constructor object to create and initialize a new instance of the constructor's declaring class, with the specified initialization parameters.
|
String
|
toString
()
Returns a string describing this Constructor. |
getDeclaringClass
public Class< T> getDeclaringClass()
-
Returns the Class object representing the class that declares the constructor represented by this Constructor object.
-
-
Specified by:
-
getDeclaringClass
in interface
Member
-
-
Returns:
-
an object representing the declaring class of the underlying member
getName
public String getName()
-
Returns the name of this constructor, as a string. This is always the same as the simple name of the constructor's declaring class.
-
-
Specified by:
-
getName
in interface
Member
-
-
Returns:
-
the simple name of the underlying member
getModifiers
public int getModifiers()
-
Returns the Java language modifiers for the constructor represented by this Constructor object, as an integer. The Modifier class should be used to decode the modifiers.
-
-
Specified by:
-
getModifiers
in interface
Member
-
-
Returns:
-
the Java language modifiers for the underlying member
-
See Also:
-
Modifier
getTypeParameters
public 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.
-
-
Specified by:
-
getTypeParameters
in interface
GenericDeclaration
-
-
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, 3rd edition
-
Since:
-
1.5
getParameterTypes
public Class[] getParameterTypes()
-
Returns an array of Class objects that represent the formal parameter types, in declaration order, of the constructor represented by this Constructor object. Returns an array of length 0 if the underlying constructor takes no parameters.
-
-
-
Returns:
-
the parameter types for the constructor this object represents
getGenericParameterTypes
public Type[] getGenericParameterTypes ()
-
Returns an array of
Type
objects that represent the formal parameter types, in declaration order, of the method represented by this
Constructor
object. Returns an array of length 0 if the underlying method 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
Type
s that represent the formal parameter types of the underlying method, in declaration order
-
Throws:
-
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
-
Since:
-
1.5
getExceptionTypes
public Class[] getExceptionTypes()
-
Returns an array of Class objects that represent the types of of exceptions declared to be thrown by the underlying constructor represented by this Constructor object. Returns an array of length 0 if the constructor declares no exceptions in its throws clause.
-
-
-
Returns:
-
the exception types declared as being thrown by the constructor this object represents
getGenericExceptionTypes
public Type[] getGenericExceptionTypes ()
-
Returns an array of
Type
objects that represent the exceptions declared to be thrown by this
Constructor
object. Returns an array of length 0 if the underlying method declares no exceptions in its
throws
clause.
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.
-
-
-
Returns:
-
an array of Types that represent the exception types thrown by the underlying method
-
Throws:
-
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
-
Since:
-
1.5
equals
public boolean equals(Object obj)
-
Compares this Constructor against the specified object. Returns true if the objects are the same. Two Constructor objects are the same if they were declared by the same class and have the same formal parameter types.
-
-
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()
,
Hashtable
hashCode
public int hashCode()
-
Returns a hashcode for this Constructor. The hashcode is the same as the hashcode for the underlying constructor's declaring class name.
-
-
Overrides:
-
hashCode
in class
Object
-
-
Returns:
-
a hash code value for this object.
-
See Also:
-
Object.equals(java.lang.Object)
,
Hashtable
toString
public String toString()
-
Returns a string describing this Constructor. The string is formatted as the constructor access modifiers, if any, followed by the fully-qualified name of the declaring class, followed by a parenthesized, comma-separated list of the constructor's formal parameter types. For example:
public java.util.Hashtable(int,float)
The only possible modifiers for constructors are the access modifiers
public
,
protected
or
private
. Only one of these may appear, or none if the constructor has default (package) access.
-
-
Overrides:
-
toString
in class
Object
-
-
Returns:
-
a string representation of the object.
newInstance
public TObjectnewInstance(Object... initargs)
[] initargs)
throws InstantiationException,
IllegalAccessException,
IllegalArgumentException,
InvocationTargetException
-
Uses the constructor represented by this Constructor object to create and initialize a new instance of the constructor's declaring class, with the specified initialization 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 number of formal parameters required by the underlying constructor is 0, the supplied initargs array may be of length 0 or null.
If the required access and argument checks succeed and the instantiation will proceed, the constructor's declaring class is initialized if it has not already been initialized.
If the constructor completes normally, returns the newly created and initialized instance.
-
-
-
Parameters:
-
initargs - array of objects to be passed as arguments to the constructor call; values of primitive types are wrapped in a wrapper object of the appropriate type (e.g. a
float
in a
Float
)
-
Returns:
-
a new object created by calling the constructor this object represents
-
Throws:
-
IllegalAccessException
- if this Constructor object enforces Java language access control and the underlying constructor is inaccessible.
-
IllegalArgumentException
- 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.
-
InstantiationException
- if the class that declares the underlying constructor represents an abstract class.
-
InvocationTargetException
- if the underlying constructor throws an exception.
-
ExceptionInInitializerError
- if the initialization provoked by this method fails.
isVarArgs
public boolean isVarArgs ()
-
Returns
true
if this constructor was declared to take a variable number of arguments; returns
false
otherwise.
-
-
-
Returns:
-
true
if an only if this constructor was declared to take a variable number of arguments.
-
Since:
-
1.5
isSynthetic
public boolean isSynthetic ()
-
Returns
true
if this constructor is a synthetic constructor; returns
false
otherwise.
-
-
Specified by:
-
isSynthetic
in interface
Member
-
-
Returns:
-
true if and only if this constructor is a synthetic constructor as defined by the Java Language Specification.
-
Since:
-
1.5
getAnnotation
public <T extends java.lang.annotation.Annotation> T getAnnotation ( Class<T> annotationClass)
-
Description copied from interface:
AnnotatedElement
-
Returns this element's annotation for the specified type if such an annotation is present, else null.
-
-
Specified by:
-
getAnnotation
in interface
AnnotatedElement
-
Overrides:
-
getAnnotation
in class
AccessibleObject
-
-
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
getDeclaredAnnotations
public java.lang.annotation.Annotation[] getDeclaredAnnotations ()
-
Description copied from interface:
AnnotatedElement
-
Returns all annotations that are directly present on this element. Unlike the other methods in this interface, this method ignores inherited annotations. (Returns an array of length zero if no annotations are directly present on this element.)
-
-
Specified by:
-
getDeclaredAnnotations
in interface
AnnotatedElement
-
Overrides:
-
getDeclaredAnnotations
in class
AccessibleObject
-
-
Returns:
-
All annotations directly present on this element
getParameterAnnotations
public java.lang.annotation.Annotation[][] getParameterAnnotations ()
-
Returns an array of arrays that represent the annotations on the formal parameters, in declaration order, of the method represented by this Method object. (Returns an array of length zero if the underlying method is parameterless.) The annotation objects contained in the returned arrays are serializable.
-
-
-
Since:
-
1.5