java.lang.reflect
Class Constructor<T>
- AnnotatedElement, GenericDeclaration, Member
The Constructor class represents a constructor of a class. It also allows
dynamic creation of an object, via reflection. Invocation on Constructor
objects knows how to do widening conversions, but throws
IllegalArgumentException
if a narrowing conversion would be
necessary. You can query for information on this Constructor regardless
of location, but construction access may be limited by Java language
access controls. If you can't do it in the compiler, you can't normally
do it here either.
Note: This class returns and accepts types as Classes, even
primitive types; there are Class types defined that represent each
different primitive type. They are
java.lang.Boolean.TYPE,
java.lang.Byte.TYPE,
, also available as
boolean.class,
byte.class
, etc. These are not to be confused with the
classes
java.lang.Boolean, java.lang.Byte
, etc., which are
real classes.
Also note that this is not a serializable class. It is entirely feasible
to make it serializable using the Externalizable interface, but this is
on Sun, not me.
boolean | equals(Object o) - Compare two objects to see if they are semantically equivalent.
|
Class | getDeclaringClass() - Gets the class that declared this constructor.
|
Class>[] | getExceptionTypes() - Get the exception types this constructor says it throws, in no particular
order.
|
Type[] | getGenericExceptionTypes() - Returns an array of
Type objects that represents
the exception types declared by this constructor, in declaration order.
|
Type[] | getGenericParameterTypes() - Returns an array of
Type objects that represents
the parameter list for this constructor, in declaration order.
|
int | getModifiers() - Gets the modifiers this constructor uses.
|
String | getName() - Gets the name of this constructor (the non-qualified name of the class
it was declared in).
|
Class>[] | getParameterTypes() - Get the parameter list for this constructor, in declaration order.
|
TypeVariable>[] | getTypeParameters() - Returns an array of
TypeVariable objects that represents
the type variables declared by this constructor, in declaration order.
|
int | hashCode() - Get the hash code for the Constructor.
|
boolean | isSynthetic() - Return true if this constructor is synthetic, false otherwise.
|
boolean | isVarArgs() - Return true if this is a varargs constructor, that is if
the constructor takes a variable number of arguments.
|
T | newInstance(java.lang.Object... args) - Create a new instance by invoking the constructor.
|
String | toGenericString()
|
String | toString() - Get a String representation of the Constructor.
|
clone , equals , extends Object> getClass , finalize , hashCode , notify , notifyAll , toString , wait , wait , wait |
equals
public boolean equals(Object o)
Compare two objects to see if they are semantically equivalent.
Two Constructors are semantically equivalent if they have the same
declaring class and the same parameter list. This ignores different
exception clauses, but since you can't create a Method except through the
VM, this is just the == relation.
- equals in interface Object
o
- the object to compare to
true
if they are equal; false
if not.
getExceptionTypes
public Class>[] getExceptionTypes()
Get the exception types this constructor says it throws, in no particular
order. If the constructor has no throws clause, returns a 0-length array
(not null).
- a list of the types in the constructor's throws clause
getGenericExceptionTypes
public Type[] getGenericExceptionTypes()
Returns an array of Type
objects that represents
the exception types declared by this constructor, in declaration order.
An array of size zero is returned if this constructor declares no
exceptions.
- the exception types declared by this constructor.
getGenericParameterTypes
public Type[] getGenericParameterTypes()
Returns an array of Type
objects that represents
the parameter list for this constructor, in declaration order.
An array of size zero is returned if this constructor takes no
parameters.
- a list of the types of the constructor's parameters
getModifiers
public int getModifiers()
Gets the modifiers this constructor uses. Use the Modifier
class to interpret the values. A constructor can only have a subset of the
following modifiers: public, private, protected.
- getModifiers in interface Member
- an integer representing the modifiers to this Member
getName
public String getName()
Gets the name of this constructor (the non-qualified name of the class
it was declared in).
- getName in interface Member
- the name of this constructor
getParameterTypes
public Class>[] getParameterTypes()
Get the parameter list for this constructor, in declaration order. If the
constructor takes no parameters, returns a 0-length array (not null).
- a list of the types of the constructor's parameters
getTypeParameters
public TypeVariable>[] getTypeParameters()
Returns an array of TypeVariable
objects that represents
the type variables declared by this constructor, in declaration order.
An array of size zero is returned if this constructor has no type
variables.
- getTypeParameters in interface GenericDeclaration
- the type variables associated with this constructor.
hashCode
public int hashCode()
Get the hash code for the Constructor. The Constructor hash code is the
hash code of the declaring class's name.
- hashCode in interface Object
- the hash code for the object
isSynthetic
public boolean isSynthetic()
Return true if this constructor is synthetic, false otherwise.
A synthetic member is one which is created by the compiler,
and which does not appear in the user's source code.
- isSynthetic in interface Member
isVarArgs
public boolean isVarArgs()
Return true if this is a varargs constructor, that is if
the constructor takes a variable number of arguments.
newInstance
public T newInstance(java.lang.Object... args)
throws InstantiationException,
IllegalAccessException,
InvocationTargetException
Create a new instance by invoking the constructor. Arguments are
automatically unwrapped and widened, if needed.
If this class is abstract, you will get an
InstantiationException
. If the constructor takes 0
arguments, you may use null or a 0-length array for
args
.
If this Constructor enforces access control, your runtime context is
evaluated, and you may have an
IllegalAccessException
if
you could not create this object in similar compiled code. If the class
is uninitialized, you trigger class initialization, which may end in a
ExceptionInInitializerError
.
Then, the constructor is invoked. If it completes normally, the return
value will be the new object. If it completes abruptly, the exception is
wrapped in an
InvocationTargetException
.
args
- the arguments to the constructor
toString
public String toString()
Get a String representation of the Constructor. A Constructor's String
representation is "<modifier> <classname>(<paramtypes>)
throws <exceptions>", where everything after ')' is omitted if
there are no exceptions.
Example:
public java.io.FileInputStream(java.lang.Runnable)
throws java.io.FileNotFoundException
- toString in interface Object
- the String representation of the Constructor
java.lang.reflect.Constructor - reflection of Java constructors
Copyright (C) 1998, 2001, 2004, 2005 Free Software Foundation, Inc.
This file is part of GNU Classpath.
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permission to link this library with independent modules to produce an
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