How to find Class's parent Classes

Hi guys
Does anybody know how can I find the Class's parent Classes. Thanks in advance.
Regards,
Mark.

Hey Mark,
From the child class, call getClass().getSuperClass() This will return the Class object of the parent of this class.
-- Bud

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Hi,
I have a basic custom class ChildCustomForm that include a JTextField. In order to know what user types, I add a listener to
this textbox:
textField.addKeyListener( new KeyAdapter()
            @Override
            public void keyPressed( final KeyEvent e )
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         });Now I have another parent class that uses ChildCustomForm, and parent class has to know once user types, then set
its own userTyped flag.
My problem is: since I added listener in child class, I cannot get textfield and add listener again in parent class, so parent class will not be able to know as soon as user types (polling is not a good solution here).
I am wondering if there is a way to do this?
regards,

jack_wns wrote:
I have a basic custom class ChildCustomForm that include a JTextField. In order to know what user types, I add a listener to
this textbox:You want to listen for input into the textbox, correct? This may take the form of keyboard input, or could be a paste-text event in which case your keylistener will miss it. I recommend that you look into a DocumentListener here so you will catch any changes, be they keyboard or cut or paste.
My problem is: since I added listener in child class, I cannot get textfield and add listener again in parent class, so parent class will not be able to know as soon as user types (polling is not a good solution here).The observer pattern may work here.

How can I casting from parent class to children class

Dear,
Could someone help me to casting from parent class to children class.
I have class like this
class parent{
String name;
String id;
public String getId() {
return id;
public void setId(String id) {
this.id = id;
public String getName() {
return name;
public void setName(String name) {
this.name = name;
class children extends parent{
String address;
public String getAddress() {
return address;
public void setAddress(String address) {
this.address = address;
public children() {
public children(parent p) {
//Do init super class here
In the constructor
public children(parent p) {
//Do init super class here
I like to init super class by object p (this is instance of parent class). The way to do is using:
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If I understand your question correctly, you are in need of a copy constructor for you class Parent. A copy constructor behaves like this:
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   one.setName("...");
   //... and all other properties of interest
   Parent two = new Parent(one);
   //Now two != one, but one.getName().equals(two.getName) for property name and all othersThe copy constructor is programmed in the Parent class, more later. Then for your child class you can use it as follows
   public class Children extends Parent {
       public Children(Parent p) {
          super(p);
   }There are at least 3 ways of programming a copy constructor:
1. Just bite the bullet: type the assignment for each field this.name = p.getName()
2. Use reflection to find all common setters/getters dynamically and assign using them
3. Use a code generator that uses 2 to give you the code for solution 1 for you to paste in.
If you find doing this a lot, there are frameworks that can do these mappings, like Dozer
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null

but problem is:
the class name is a string "JFrame", which is
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Hi Anirban,
The function module always return a class_not_defined exception.
Is there anything wrong when loading this?
REPORT ztest123.
DATA : lv_class type CSMCLASS.
DATA : ls_super_class type CSM_CLINHL.
lv_class = 'Z_CL_DEMO_STUDENT_02'.
CALL FUNCTION 'SCSM_MD_CLASS_GET_SUPER_CLASS'
EXPORTING
   NAMESPACE
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    class                     = lv_class
importing
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   NS_SUPER_CLASS            =
exceptions
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   class_is_base_class       = 2
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IF sy-subrc = 0.
ENDIF.
BREAK-POINT.
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Actual Mechanism of Object class as Parent Class to all the classes

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Can you please explain this elaborately?
Thanks in Advance,
Uday

Udaya Shankara Gandhi wrote:
Hi All,
We know that all the classes in the java platform are descendants of Object class. Even if we are writing a new class also, in the absence of any other explicit superclass, every class is implicitly a subclass of Object. As we are not extending the Object class directly, then how come the methods in the Object are inheriting to the Sub class what we have written? How the java maintain this heirarchy? Because the language is defined that way. Compilers implement the language according to the rules of the JLS. Exactly how they do that is undefined. It's up to each compiler. As long as it follows the rules defined in the JLS for parsing the code and generating the .class file, that's all that matters. However, somewhere in the compiler is code that does approximately this:
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generate corresponding bytes for extends in .class file
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generate bytes for extends java.lang.Object in .class file
}No great mystery, nor philosophical question.

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Are u looking for this class -CL_XMS_PLSRV_IE_ADAPTER ? Go to SE80 choose class Interface give SRV and click the down arrow icon, it will give u some list of classes. I don't know if it's useful or not, just do a seach..
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Finding Methods In a class

Is there anyway I can find all the methods that are available to
in a class with the help of java code. For example: the Math class. Is there a
programming technique to find all the methods available in the
math class or any class.
Thanx
-Reds

Hi raja17 :
try this example and you'll understand how to find all method of class :
//this code print all the return type and the names of a class :
Class l_class = Class.forName("javax.swing.JFrame");
java.lang.reflect.Method[] l_method = l_class.getMethods();
for (int i =0; i< l_method.length ; i++) {
System.out.println(l_method.getReturnType() +" "+ l_method[i].getName());

Even i call this() paramerterised constuctor in my class, Is super class su

Even i call this() paramerterised constuctor in my class, Is super class super() parameter less constuctor invokes?
I have excuted the following program. And result will be as follows:
Grandparent() constructor
Parent 25 constructor
Parent() constructor
Child() constructor
The program is below:
class ConstructorChain {
public static void main(String[] args) {
Child c = new Child();
class Child extends Parent {
Child() {
System.out.println("Child() constructor");
class Parent extends Grandparent {
Parent() {
this(25);
System.out.println("Parent() constructor");
Parent(int x) {
System.out.println("Parent(" + x + ") constructor");
class Grandparent {
Grandparent() {
System.out.println("Grandparent() constructor");
for this my excepected answer is
Parent 25 constructor
Parent() constructor
Child() constructor
because in parent class i defined this() constructor so, as my undersatnd is it never call Grand Parent Constructor as it is default parameterless constructor.
please Advise me
Aruna

You can't initialize a class without it's super classes constructor being run. So even if you call another constructor (of the same class), the parent classes constructor will still be called.

Want to find out parent class of a class without using getSuperClass

hi,
I am trying to write a code to find out the base class /interfaces of a class by its object and i dont want to use getSuperClass,getInterfaces methods.
Below is a snippet i tried but it does not work:
public class Test extends Parent{
public void disp(){
System.out.println(super.getClass().getName());
public static void main(String args[]){
Test test = new Test();
test.disp2();
this outputs the child class only does not output the parent class.
Is there any method to do so?
Thanks,
Anirudh

Ok, If it can not be done then i must not ask.
So you have answered it that it is not possible without these.Thats what i wanted to know.
Should have framed the question like is it possible?and if possible how?
Thanks
Anirudh

How to get the class name static method which exists in the parent class

Hi,
How to know the name of the class or reference to instance of the class with in the main/static method
in the below example
class AbstA
public static void main(String[] args)
System.out.println(getXXClass().getName());
public class A extends AbstA
public class B extends AbstA
on compile all the class and run of
java A
should print A as the name
java B
should print B as the name
Are there any suggestions to know the class name in the static method, which is in the parent class.
Regards,
Raja Nagendra Kumar

Well, there's a hack you can use, but if you think you need it,Could you let me the hack solution for this..
you probably have a design flaw and/or a misunderstanding about how to use Java.)May be, but my needs seems to be very genuine..of not repeat the main method contents in every inherited class..
The need we have is this
I have the test cases inheriting from common base class.
When the main method of the test class is run, it is supposed to find all other test cases, which belong to same package and subpackages and create a entire suite and run the entire suite.
In the above need of the logic we wrote in the main method could handle any class provided it knows what is the child class from which this main is called.
I applicate your inputs on a better way to design without replicating the code..
In my view getClass() should have been static as the instance it returns is one for all its instances of that class.
I know there are complications the way compiler handles static vars and methods.. May be there is a need for OO principals to advance..
Regards,
Raja Nagendra Kumar
Edited by: rajanag on Jul 26, 2009 6:03 PM

How to find Class's parent Classes

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