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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.lang.reflect 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   java.lang.reflect.AccessibleObject
      java.lang.reflect.Constructor

Constructor
final public class Constructor extends AccessibleObject implements Member(Code)
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
See Also:   java.lang.Class
See Also:   java.lang.Class.getConstructors
See Also:   java.lang.Class.getConstructor(Class[])
See Also:   java.lang.Class.getDeclaredConstructors
author:
   Nakul Saraiya





Method Summary
public  booleanequals(Object obj)
     Compares this Constructor against the specified object. Returns true if the objects are the same.
public  ClassgetDeclaringClass()
     Returns the Class object representing the class that declares the constructor represented by this Constructor object.
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.
public  intgetModifiers()
     Returns the Java language modifiers for the constructor represented by this Constructor object, as an integer.
public  StringgetName()
     Returns the name of this constructor, as a string.
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.
public  inthashCode()
     Returns a hashcode for this Constructor.
public  ObjectnewInstance(Object[] initargs)
     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 tothe constructor call; values of primitive types are wrapped ina wrapper object of the appropriate type (e.g.

public  StringtoString()
     Returns a string describing this Constructor.



Method Detail
equals
public boolean equals(Object obj)(Code)
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.



getDeclaringClass
public Class getDeclaringClass()(Code)
Returns the Class object representing the class that declares the constructor represented by this Constructor object.



getExceptionTypes
public Class[] getExceptionTypes()(Code)
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. the exception types declared as being thrown by theconstructor this object represents



getModifiers
public int getModifiers()(Code)
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.
See Also:   Modifier



getName
public String getName()(Code)
Returns the name of this constructor, as a string. This is always the same as the simple name of the constructor's declaring class.



getParameterTypes
public Class[] getParameterTypes()(Code)
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. the parameter types for the constructor this objectrepresents



hashCode
public int hashCode()(Code)
Returns a hashcode for this Constructor. The hashcode is the same as the hashcode for the underlying constructor's declaring class name.



newInstance
public Object newInstance(Object[] initargs) throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException(Code)
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 tothe constructor call; values of primitive types are wrapped ina wrapper object of the appropriate type (e.g. a floatin a java.lang.Float Float) a new object created by calling the constructorthis object represents
exception:
  IllegalAccessException - if this Constructor objectenforces Java language access control and the underlyingconstructor is inaccessible.
exception:
  IllegalArgumentException - if the number of actualand formal parameters differ; if an unwrappingconversion for primitive arguments fails; or if,after possible unwrapping, a parameter valuecannot be converted to the corresponding formalparameter type by a method invocation conversion.
exception:
  InstantiationException - if the class that declares theunderlying constructor represents an abstract class.
exception:
  InvocationTargetException - if the underlying constructorthrows an exception.
exception:
  ExceptionInInitializerError - if the initialization provokedby this method fails.




toString
public String toString()(Code)
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.




Methods inherited from java.lang.reflect.AccessibleObject
public boolean isAccessible()(Code)(Java Doc)
public static void setAccessible(AccessibleObject[] array, boolean flag) throws SecurityException(Code)(Java Doc)
public void setAccessible(boolean flag) throws SecurityException(Code)(Java Doc)

Methods inherited from java.lang.Object
public boolean equals(Object obj)(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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