Creating a object of Protected Constructor ?

This code is working fine for me
<defvar name='dateFormat'>
<new class='java.text.SimpleDateFormat'>
<s>dd-MMM-yyyy</s>
</new>
</defvar>
but not this below one
<defvar name='xmas'>
<new class='java.util.Calendar'/>
</defvar>
when i checked java doc it says
protected Calendar()
so how can i create or access a protected constructor in java like above one.
Thanks in advance.

<invoke name='getInstance' class='java.util.Calendar'/>
Dana Reed
AegisUSA
Denver, Co
[email protected]
"No Hiring best-in-class identity experts"
Inquire via email.

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Create an object instance without calling its constructor?

Hi,
Sometimes it's useful to create object instances without calling their constructor. When? For example object deserialization.
By default when deserializating an object, the instance in the VM is created by calling the default constructor of the first non Serializable super-class (if you don't have such you're in trouble). I think that the db4o object database don't even call any constructor you may have written.
So such thing exists, but how is this possible? I fugured out that sun's deserialization mechanism first finds the constructor of the first non Serializable super-class and then:
cons = reflFactory.newConstructorForSerialization(cl, cons); Here I'm stuck.
Here's the source of the method for finding serializable constructor:
     * Returns subclass-accessible no-arg constructor of first non-serializable
     * superclass, or null if none found. Access checks are disabled on the
     * returned constructor (if any).
    private static Constructor getSerializableConstructor(Class cl) {
     Class initCl = cl;
     while (Serializable.class.isAssignableFrom(initCl)) {
         if ((initCl = initCl.getSuperclass()) == null) {
          return null;
     try {
         Constructor cons = initCl.getDeclaredConstructor(new Class[0]);
         int mods = cons.getModifiers();
         if ((mods & Modifier.PRIVATE) != 0 ||
          ((mods & (Modifier.PUBLIC | Modifier.PROTECTED)) == 0 &&
           !packageEquals(cl, initCl)))
          return null;
         cons = reflFactory.newConstructorForSerialization(cl, cons);
         cons.setAccessible(true);
         return cons;
     } catch (NoSuchMethodException ex) {
         return null;
    }So any info about this ReflectionFactory, and the problem as a whole?
Thanks.

So the question is how to create object instance without initializing it (calling the constructor)? And if you have any info about ReflectionFactory it will be useful too.
When serializing an object you save all its fields and some extra info. When you deserialize it you have to reconstruct it, by copying the fields back, but not to reinitialize.
import java.lang.reflect.*;
import java.io.Serializable;
import java.security.AccessController;
import sun.reflect.ReflectionFactory;
public class Test0 implements Serializable {
    public Test0() {
        System.out.println("Test0");
    public static void main(String[] args) throws Exception {
        Constructor<Test0> constr = reflectionFactory.newConstructorForSerialization(Test0.class, Object.class.getConstructor(new Class[0]));
        System.out.println(constr.newInstance(new Object[0]).getClass());
    private static final ReflectionFactory reflectionFactory = (ReflectionFactory)
     AccessController.doPrivileged(
         new ReflectionFactory.GetReflectionFactoryAction());
}When you execute this piece you get:
class Test0

Invoked super class constructor means create an object of it?

Hei,
i have create one class that extends another class. when i am creating an object of sub class it invoked the constructor of the super class. thats okay.
but my question is :
constructor is invoked when class is intitiated means when we create an
object of sub class it automatically create an object of super class. so means every time it create super class object.

Hi,
   An object has the fields of its own class plus all fields of its parent class, grandparent class, all the way up to the root class Object. It's necessary to initialize all fields, therefore all constructors must be called! The Java compiler automatically inserts the necessary constructor calls in the process of constructor chaining, or you can do it explicitly.
   The Java compiler inserts a call to the parent constructor (super) if you don't have a constructor call as the first statement of you constructor.
Normally, you won't need to call the constructor for your parent class because it's automatically generated, but there are two cases where this is necessary.
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Thanks & Regards,
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Always create any Object even without default constructor?

hi!
i'm wondering if there's an easy way to construct an object of a given class?
let's assume i've got a class
class MyClass
public MyClass( OtherClass c)
}now when i get the constructors for its Class-object with
clazz.getDeclaredConstructor()
it will return null;
ok now i know ther's no default/empty constructor.
does it make sense to then search for the next constructor with n parameters?
and then invoke it with nonsense values?
what happens if the parameter classes also have no default constructor to create parameter objects? like this:
class OtherClass
public OtherClass ( MyClass c)
}now there's a loop between the two constructors and i can't create empty parameter values to invoke any of them!
i wonder how the serialization engine works then?
or did i miss something trivial (it's really late here ;) )

What's the problem? To create a MyClass object, you
don't need any OtherClass objects. You just do the
equivalent ofnew MyClass(null)in your
reflective code.
slap forehead with toilet
thanks for the tip.
as i said there was something absolutely easy, it's tough not seeing the forest for the trees ;/
But I agree with jschell, if your requirements are to
create objects of arbitrary classes and call
arbitrary methods with arbitrary parameter lists,
then whoever did your design didn't think for long
enough.WELL. you're absolutely right. but when it's time to process ANY given object there's no reliability on whatever design was chosen. or, would you insist the developer had to provide standatized formats when you write a debugger? no it has to work with any. so must i!

Can I create the object of an protected inner class of a Base class in to t

Dear All,
Can I create the object of an protected inner class of a Base class in to the subclass ?
e.g.
public class Base{
     protected class Inner {};
Public class Sub extends Base{
     Public Inner amethod (){
          Return new Inner(); //here I get an exception as
                            //Inner has protected access
}Regards,
Ishan

@Op. The code that you posted isn't close to compiling. Java is case sensitive. It should be public and not Public, and return instead of Return.
Kaj

Create Class objects from an Array of File Objects

Hi There,
I'm having extreme difficulty in trying to convert an array of file objects to Class objects. My problem is as follows: I'm using Jfilechooser to select a directory and get an array of files of which are all .class files. I want to create Class objects from these .class files. Therefore, i can extract all the constructor, method and field information. I eventually want this class information to display in a JTree. Very similar to the explorer used in Netbeans. I've already created some code below, but it seems to be throwing a NoSuchMethodError exception. Can anyone please help??
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Vikash
/* the following is the class im using */
class FileClassLoader extends ClassLoader {
private File file;
public FileClassLoader (File ff) {
this.file = ff;
protected synchronized Class loadClass() throws ClassNotFoundException {
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int size = (int)file.length();
// Reserve space to read
byte buff[] = new byte[size];
// Get stream to read from
FileInputStream fis = new FileInputStream(file);
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e.printStackTrace();
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final JFileChooser f = new JFileChooser();
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System.out.println("File name: " + allfiles[k].getName()); // used for debugging
FileClassLoader loader = new FileClassLoader(allfiles[k]);
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java.lang.reflect.Field[] fields = cl.getDeclaredFields();
System.out.println("Class Name: " + cl.getName());
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It's throwing the exeption on the line:
FileClassLoader loader = new FileClassLoader(allfiles[k]);
I'm sure its something to do with the extended class i've created. but i cant seem to figure it out..
Thanks if you can figure it out

What is the diffrence between extends and creating new object?

HI ALL,
what is the diffrence between extends and creating new object?
meaning
class base{
class derived extends base{
class base{
class derived {
derived(){
base var = new base();
can u people tell me diffence from the above examples.
THANKS.
ANANDA

When you create a new object you have to supply the class to which that
object belongs. A class can extend from another class. If it does so
explicitly you can define the 'parent' class from which the class extends.
If you don't explicitly mention anything, the class will implicitly extend
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Your example is a bit convoluted: when you create a Derived object,
its constructor creates another object, i.e. an object from the class from
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kind regards,
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Error #1056, creating dynamic object

Hi,
I am simultaneously creating an object and adding it to an array, perhaps ill-advisedly. The following code worked on the main timeline, but not when I moved it to the constructor of a document class:
package {
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The following error is generated:
>ReferenceError: Error #1056: Cannot create property xx0 on IconTour.
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Nope. No mention. However, I guess I don't need to dynamically create a variable as this works:
iconCreationList.push(xx = new MyIcon(thePoint,"folder","Text for the folder", "Folder", defaultColor, overColor));
iconCreationList.push(xx = new MyIcon(thePoint,"assignments","Text for the assignment", "Assignments", defaultColor, overColor));
where this does not:
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iconCreationList.push(this["xx"+iconCreationList.length] = new MyIcon(thePoint,"assignments","Text for the assignment", "Assignments", defaultColor, overColor));
AS doesn't care if I add more than one object to the array that is named xx. I probably won't be referencing xx by that name anyway, just by iconCreationList[1].

Invalid stored Object Types with Constructor Function

hi folks,
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SQLPlus the only feddback is
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I can't seem to create my object for my array!!

I am in school. My project is to create bank accounts for 3 people. I have 2 for loops, one for my account_numbers and the other for the months of the year. This will track each account's transactions for the year. I initialized my array: int[] accnt_num_array = {123, 523, 723}; Account 123 should be accnt_num_array[0] and so on. My next line is: accnt_num_array = new int[3]; To create the object, and call my method getDeposit, but I get an error: "object type required, but int found." I need help desperately.
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int[] accnt_num_array = {123, 523, 723}; Account 123 should
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If I understood you right, you are thinking far too complicated.
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Am struck creating a HR object with subty = 99.
I was trying to BDC PP01 transaction.
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Class.forName does not create an object. It returns a reference to the Class object that describes the metadata for the class in question--what methods and fields it has, etc.
To create an object--regardless of whether it's your class or some other class--you could call newInstance on the Class object returned from Class.forName, BUT only if that class has a no-arg constructor that you want to call.
Class<MyClass> clazz = Class.forName("com.mycompany.MyClass");
MyClass mine = clazz.newInstance();If you want to use a constructor that takes parameters, you'll have to use java.lang.reflect.Constructor.
Google for java reflection tutorial for more details.
BUT reflection is often abused, and often employe when not needed. Why is it that you think you need this?

How to create an object of our own class by using Class.forName()??

how to create an object of our own class by using Class.forName()??
plzz anser my qustion soon..

Class.forName does not create an object. It returns a reference to the Class object that describes the metadata for the class in question--what methods and fields it has, etc.
To create an object--regardless of whether it's your class or some other class--you could call newInstance on the Class object returned from Class.forName, BUT only if that class has a no-arg constructor that you want to call.
Class<MyClass> clazz = Class.forName("com.mycompany.MyClass");
MyClass mine = clazz.newInstance();If you want to use a constructor that takes parameters, you'll have to use java.lang.reflect.Constructor.
Google for java reflection tutorial for more details.
BUT reflection is often abused, and often employe when not needed. Why is it that you think you need this?

Object type with constructor gets PLS-00307 (10g)

Hi all,
I have the following code, and I am getting the following error. I want to have a constructor that can be called without specifying the parameters by name. Is that not possible?
What am I doing wrong?
Thanks!
Error:Error at line 50
ORA-06550: line 5, column 17:
PLS-00307: too many declarations of 'TRANSFEROBJECT_O' match this call
ORA-06550: line 5, column 5:
PL/SQL: Statement ignoredCode:DROP TYPE TransferObject_o
CREATE TYPE
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, m_attribute VARCHAR2(4000)
, CONSTRUCTOR FUNCTION TransferObject_o
        p_objectId NUMBER--   := NULL
      , p_attribute VARCHAR2-- := NULL
    ) RETURN SELF AS RESULT
CREATE TYPE BODY
    TransferObject_o
AS
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        p_objectId NUMBER--   := NULL
      , p_attribute VARCHAR2-- := NULL
    ) RETURN SELF AS RESULT
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        SELF.m_objectId := p_objectId;
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END;
DECLARE
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BEGIN
    l_object := TransferObject_o(1, 'B');
END;
/

Hi,
When you create an OBJECT, Oracle automatically creates a constructor with one argument for each of the object's attributes. You've created a second constructor, that has the same signature, except that the arguments in your functin are optional. When you call an overloaded routine ( whether it's a constructor or any other function or procedure), Oracle has to decide which of the versions you're calling. If you call the TransferObject_o constructor with fewer than two arguments, the system knows you mean the version you wrote, since the default constructor has two required arguments. But when you call the TransferObject_o constructor with exactly two arguments, it has no way of telling which version to use, and raises an error.
The Oracle 10.1 "PL/SQL User's Guide and Reference" says:
"You can define your own constructor methods, either overriding a system-defined constructor, or defining a new function with a different signature."
I couldn't find an example of overriding the constructor (not that I spent a lot of time looking. If you find one, or figure out how to do it, please post an example or a link here.).
Failing that, you can always give your constructor a different signature (e.g., put the VARCHAR2 argument first).

Creating a object of Protected Constructor ?

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