Extending a class through inner anonymous class??
What kind of construction is this?
SomeClass sc = new SomeClass()
public void sayHello()
System.out.println("Hello");
};I thought this is equal to sc extends SomeClass, and this is what the decompiled inner class tells. Anyhow I don't think this is the same as extending a class cause you can only overwrite methods which are declared/implemented in SomeClass, adding new methods doesn't make sense to compiler. If in the example above SomeClass doesn't contain sayHello method
sc.sayHello();
will result in compiler error message.
The compiler error is because you are calling the method via a reference of type SomeClass, not a reference of the type of the anonyomous class you have created. If you need to do that, then use a named class.
You can have any number of methods in an anonymous class, but you will only be able to call them from within the class itself unless they are declared in the superclass or super-interface.
Similar Messages
-
How to access class variables in anonymous class??.
I have a boolean class level variable. Fom a button action , this boolean will set to true and then it used in anonymous class. In anonymous class, I am getting default value instead of true. Could u anyone help in this plzzz.
first of all, you don't want parent because that is something that Containers use to remember their containment hierarchy. you are thinking of super which is also incorrect, because that has to do with inheritance.
the problem here is a scoping problem. you generally would use final if you were accessing variables in an anonymous class that are in the local scope. in this case, you just need to create some test code and play with it. snip the code below and play with it. it shows both the given examples and some additional ways to change/display class variables.
good luck, hackerx
import javax.swing.*;
import java.awt.event.*;
public class Foo extends JPanel
private boolean the_b = true;
public static void main(String[] args)
Foo f = new Foo();
JFrame frame = new JFrame();
frame.getContentPane().add(f);
frame.pack();
frame.show();
public Foo()
// get your button
JButton b = new JButton("Not!");
b.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent ae)
// *** uncomment these to play around ***
// Foo.this.the_b = false; // this will work, but unnecessary
// the_b = false; // this works fine too
notFoo();
this.add(b);
// something to show the value that accesses a class variable
// using an inner class instead of final nonsense
DisplayThread t = new DisplayThread();
t.start();
private void notFoo()
the_b = !the_b;
class DisplayThread extends Thread
public void run()
while(true)
System.err.println("boolean value: " + the_b);
try {
sleep(1000);
} catch(InterruptedException ie) {}
} -
I have searched and found other versions of this question, but haven't run across the answer yet, so...
My program runs correctly from the command line.
When I try to execute the .jar file using the java -jar TIS.jar command I get a noclassdeffound error. The class it can't find happens to be the first inner class it encounters. I have checked the jar file, and the class is in there. Is there a problem with java finding inner classes in jar files?
Some supporting info:
here is my manifest:
Manifest-Version: 1.0
Created-By: 1.4.1_01 (Sun Microsystems Inc.)
Main-Class: ToolInventorySystem
class not found has the name ControlScreen$addToolListener.class
I found in another post that the $ indicates either an anonymous class or an inner class (I have both in my programs)
Thanks in advanceWow, that formatting didn't work, let me try that again...
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class ControlScreen extends JFrame {
//Fields for screen size
public static final int DEFAULT_WIDTH = 500;
public static final int DEFAULT_HEIGHT = 500;
public ControlScreen(){
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
Container contentPane = getContentPane();
JPanel SelectButtonPanel = new JPanel();
//Selection Buttons
//add new tools
JButton addToolButton = new JButton("Add Tool");
SelectButtonPanel.add(addToolButton);
ActionListener atl = new AddToolListener();
addToolButton.addActionListener(atl);
//add new projects
JButton addProjectButton = new JButton("Add Project");
SelectButtonPanel.add(addProjectButton);
ActionListener apl = new AddProjectListener();
addProjectButton.addActionListener(apl);
//check out tools
JButton checkOutToolButton = new JButton("Check Out Tools");
SelectButtonPanel.add(checkOutToolButton);
ActionListener cotl = new CheckOutToolListener();
checkOutToolButton.addActionListener(cotl);
//return tools
JButton returnToolButton = new JButton("Return Tool");
SelectButtonPanel.add(returnToolButton);
ActionListener rtl = new ReturnToolListener();
returnToolButton.addActionListener(rtl);
//generate bill
JButton billButton = new JButton("Create Billing Statement");
SelectButtonPanel.add(billButton);
ActionListener bl = new BillListener();
billButton.addActionListener(bl);
contentPane.add(SelectButtonPanel, BorderLayout.SOUTH);
}//close constructor
class AddToolListener implements ActionListener{
public void actionPerformed(ActionEvent event){
//This class will display the tool entry frame
ToolScreen ts = new ToolScreen();
ts.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
ts.show();
}//close method
}//close addToolListener
class AddProjectListener implements ActionListener{
public void actionPerformed(ActionEvent event){
//This class will display the project entry frame
ProjectScreen ps = new ProjectScreen();
ps.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
ps.show();
}//close method
}//close addprojectlistener
class CheckOutToolListener implements ActionListener{
public void actionPerformed(ActionEvent event){
//this class displays the list of active projects
Project[] projectList = TISController.getProjectList();
CheckoutProjectListDisplayScreen cplds = new CheckoutProjectListDisplayScreen(projectList);
cplds.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
cplds.show();
}//close method
}//close check out tool listener
class ReturnToolListener implements ActionListener{
public void actionPerformed(ActionEvent event){
//this class displays the list of active projects
Project[] projectList = TISController.getProjectList();
ReturnProjectListDisplayScreen rplds = new ReturnProjectListDisplayScreen(projectList);
rplds.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
rplds.show();
}//close method
}//close check out tool listener
class BillListener implements ActionListener{
public void actionPerformed(ActionEvent event){
//this class displays the list of active projects
Project[] projectList = TISController.getProjectList();
BillProjectListDisplayScreen bplds = new BillProjectListDisplayScreen(projectList);
bplds.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
bplds.show();
}//close method
}//close create bill listener
}//close Control Screen class -
Anonymous classes and non-default constructors
I've got a class with only one constructor and that takes an argument. In another class, I want to have an anonymous class that extends this class with something like:
new MyClassWithoutDefaultConstructor(myConstuctorArg) {...}
However, I get a "The constructor MyClassWithoutDefaultConstructor() is undefined".
As a workaround I can create a local class (not anonymous) that extends MyClassWithoutDefaultConstructor and then includes a default constructor which passes my arg to the super constructor. But this is rather messy.
Am I missing something?The following works fine for me (prints 5):
public abstract class Test
private final int parameter;
public Test(int parameter)
this.parameter=parameter;
public int getParameter()
return parameter;
public abstract int getSomething();
public static void main(String[] args)
Test test=new Test(3)
public int getSomething()
return getParameter()+2;
System.out.println(test.getSomething());
}You say your anonymous class is in a different class to the one it extends - what is the access modifier on the constuctor you are calling in the base class? Is the constructor visible from the class containing the anonymous class? Can you post a concise example that produces the compiler error that you are getting? -
Custom class loader and local class accessing local variable
I have written my own class loader to solve a specific problem. It
seemed to work very well, but then I started noticing strange errors in
the log output. Here is an example. Some of the names are in Norwegian,
but they are not important to this discussion. JavaNotis.Oppstart is the
name of my class loader class.
java.lang.ClassFormatError: JavaNotis/SendMeldingDialog$1 (Illegal
variable name " val$indeks")
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:502)
at java.lang.ClassLoader.defineClass(ClassLoader.java:431)
at JavaNotis.Oppstart.findClass(Oppstart.java:193)
at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
at java.lang.ClassLoader.loadClass(ClassLoader.java:255)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
at JavaNotis.SendMeldingDialog.init(SendMeldingDialog.java:78)
at JavaNotis.SendMeldingDialog.<init>(SendMeldingDialog.java:54)
at JavaNotis.Notistavle.sendMelding(Notistavle.java:542)
at JavaNotis.Notistavle.access$900(Notistavle.java:59)
at JavaNotis.Notistavle$27.actionPerformed(Notistavle.java:427)
JavaNotis/SendMeldingDialog$1 is a local class in the method
JavaNotis.SendMeldingDialog.init, and it's accessing a final local
variable named indeks. The compiler automatically turns this into a
variable in the inner class called val$indeks. But look at the error
message, there is an extra space in front of the variable name.
This error doesn't occur when I don't use my custom class loader and
instead load the classes through the default class loader in the JVM.
Here is my class loading code. Is there something wrong with it?
Again some Norwegian words, but it should still be understandable I hope.
protected Class findClass(String name) throws ClassNotFoundException
byte[] b = loadClassData(name);
return defineClass(name, b, 0, b.length);
private byte[] loadClassData(String name) throws ClassNotFoundException
ByteArrayOutputStream ut = null;
InputStream inn = null;
try
JarEntry klasse = arkiv.getJarEntry(name.replace('.', '/')
+ ".class");
if (klasse == null)
throw new ClassNotFoundException("Finner ikke klassen "
+ NOTISKLASSE);
inn = arkiv.getInputStream(klasse);
ut = new ByteArrayOutputStream(inn.available());
byte[] kode = new byte[4096];
int antall = inn.read(kode);
while (antall > 0)
ut.write(kode, 0, antall);
antall = inn.read(kode);
return ut.toByteArray();
catch (IOException ioe)
throw new RuntimeException(ioe.getMessage());
finally
try
if (inn != null)
inn.close();
if (ut != null)
ut.close();
catch (IOException ioe)
}I hope somebody can help. :-)
Regards,
Knut St�reI'm not quite sure how Java handles local classes defined within a method, but from this example it seems as if the local class isn't loaded until it is actually needed, that is when the method is called, which seems like a good thing to me.
The parent class is already loaded as you can see. It is the loading of the inner class that fails.
But maybe there is something I've forgotten in my loading code? I know in the "early days" you had to do a lot more to load a class, but I think all that is taken care of by the superclass of my classloader now. All I have to do is provide the raw data of the class. Isn't it so? -
Extending inner [nested] classes
OK I've got a class (A) with a nested class (B).
B accesses variables etc. in A and does its own thing, but what I'd like to do is make B abstract and have a number of classes extend it - which is used depends on program arguments.
The problem I'm having is that the new class (C) that extends B does not seem to have access to any of the variables in A.
I originally tried:
class C extends B
and
class C extends A$B
I also tried this, which I found on this site:
class C extends A.B
(thats A-dot-B) but it still doesnt seem to be working.
Is it possible to extend [abstract] inner classes like this? If so, how? Any help appreciated. cheers.Here I found a solution. However, it is not so elegant. In fact, I am also having trouble in extending a nested class in an elegant way.
Here, A is the original top-level class and A.B is the nested class of A. A2 extends A. B2 and B3 extends A.B. Main is the class where the main() method can be found.
// A.java
public class A {
private B b;
public void setB (B b) {
this.b = b;
public B getB () {
return b;
public abstract class B {
public abstract String getName();
// A2.java
public class A2 extends A {
public class B2 extends A.B {
public String getName () {
return "Peter";
public class B3 extends A.B {
public String getName () {
return "John";
public class Main {
public static void main (String[] args) {
A a = new A2 ();
A.B b = ((A2)a).new B2 ();
a.setB (b);
System.out.println (a.getB().getName()); // John
b = ((A2)a).new B3 ();
a.setB (b);
System.out.println (a.getB().getName()); // Peter
}You may see here that I used "A" as the type of "a". Te reason is I want to use "a" as an "A", not "A2". If you don't want to do casting, you may simply use "A2" as the type. The class A2 can be blank. It is only a "container" of the classes B2 and B3. -
Where is the anonymous class in this? (lotsa code)
When I compile ThreadPool.java, I get three classes: ThreadPool.class, ThreadPool$WorkerThread.class, and ThreadPool$1.class. I understand the first two, but I can't figure out where the anonymous class is coming from. Could it be some kind of automatically-generated wrapper class caused by the fact that all accesses to the Queue object are within synchronized blocks? Curiosity attacks!
Thanks,
Krum
ThreadPool.java:
package krum.util;
* A thread pool with a bounded task queue and fixed number of worker threads.
public class ThreadPool {
protected Queue queue;
public ThreadPool(int threads, int taskQueueSize) {
queue = new Queue(taskQueueSize);
/* create the worker threads */
for(int i = 0; i < threads; ++i) {
Thread t = new Thread(new WorkerThread());
t.setDaemon(true);
t.start();
* Queues a task to be executed by this ThreadPool. If the task queue is
* full, the task will run in the calling thread. (Could easily be modified
* to throw an exception instead.)
public void doTask(Runnable task) {
boolean added = false;
synchronized(queue) {
if(!queue.isFull()) {
queue.add(task);
added = true;
queue.notify();
if(!added) task.run();
* Tests if the task queue is empty. Useful if you want to wait for all
* queued tasks to complete before terminating your program.
public boolean queueEmpty() {
synchronized(queue) {
return queue.isEmpty();
private class WorkerThread implements Runnable {
public void run() {
Runnable task;
while(true) {
task = null;
synchronized(queue) {
try {
if(queue.isEmpty()) queue.wait();
else task = (Runnable)queue.getNext();
} catch(InterruptedException e) { break; }
if(task != null) task.run();
} /* end inner class WorkerThread */
} /* end class ThreadPool */Queue.java:
package krum.util;
* Implements a FIFO queue for storage and retrieval of objects. This class
* is not synchronized.
public class Queue {
/** circular buffer containing queued objects */
protected Object[] queue;
/** index of next object to be returned */
protected int nextReturn;
/** index in which to store next object inserted */
protected int nextInsert;
public Queue(int capacity) {
queue = new Object[capacity];
nextInsert = 0;
nextReturn = 0;
public boolean isEmpty() { return(queue[nextReturn] == null); }
public boolean isFull() { return(queue[nextInsert] != null); }
public void add(Object obj) throws QueueException {
if(queue[nextInsert] == null) {
queue[nextInsert] = obj;
++nextInsert;
nextInsert %= queue.length;
} else throw new QueueException();
public Object getNext() throws QueueException {
if(queue[nextReturn] != null) {
Object obj = queue[nextReturn];
queue[nextReturn] = null;
++nextReturn;
nextReturn %= queue.length;
return obj;
} else throw new QueueException();
} /* end class Queue */QueueException.java:
package krum.util;
public class QueueException extends RuntimeException { }I can't explain why it happens, but I've seen this
behaviour before. I found that it was to do with an
inner class (WorkerThread in your code) having a
private constructor - if I made my inner class
constructor at least package (default) access, then
the anonymous class was no longer created.
The generated default constructor for a class has the
same access modifier as the class, so in your example,
the default constructor that the compiler generates is
private.
I suspect the problem will go away if you either:
1. Remove the private modifier from the WorkerThread
class declaration.
or:
2. Add a no-args constructor to the WorkerThread
class, and don't specify an access modifier.Yes, the reason is the private constructor. After decompile using JAD, the reason seems to be: if a private inner class does not explicitly have any constructor, a default no-arguments private constructor is created, and seems this default constructor can't be accessed directly (in source code, it can). So, another no-private constructor (package accessible) is created automatically (with an argument of Object's type), and the
new WorkThread();is actually like this:
new WorkThread(null);
private class WorkThread implements Runnable{
private WorkThread(){}
WorkThread(Object obj) {
this();
}and I would guess it's using anonymous class tech to achieve this like:
new WorkThread(null) {
WorkThread(Object obj){
this();
}The JLS should have specified this situation. -
Can you implement an interface on an anonymous class ?
(of course the anonymous class does not belongs or extends of an interface)
I know this sound strange but it's in a code I have to maintain and in order to make less changes as posible I want to try this.
ie.
public JTable createTable()
//I want this JTable to implent an ActionListerner or any Interface,
//is this posible?
return new JTable()
}Thanks!
que_genio//I want this JTable to implent an ActionListerner or any Interface,
//is this posible?
return new JTable()
{Yes use an anonymous inner class -
Accessing inner protected class with .new
My weak understanding is that inner classes are no different in terms of access modification as other class members, thus I was expecting the following to compile:
package A;
public class ClassA {
protected void protectedMethod() {}
protected class ProtectedInnerClass {}
}is being used over here in package B
package B;
import A.*;
public class ClassB extends ClassA {
public static void main(String[] args) {
ClassB b = new ClassB();
b.protectedMethod(); // works fine. I am inheriting ClassA and calling the protected method.
ClassB.ProtectedInnerClass c = b.new ProtectedInnerClass(); // compiler error: ProtectedInnerClass is protected
}Why can I not access the protected inner class when ClassB is inheriting it as is the case with the protected method?
thanks in advance!So classes that inherit other classes with protected inner classes will not be able to instantiate these inner classes regardless of the inheritance relationship.No, that's not true. Example:
package A;
public class ClassA {
protected void protectedMethod() {
protected class ProtectedInnerClass { // class is protected
public ProtectedInnerClass() { } // <-- nota bene
package B;
import A.ClassA;
public class ClassB extends ClassA {
public static void main(String[] args) {
ClassB b = new ClassB();
b.protectedMethod(); // works fine.
ClassB.ProtectedInnerClass c = b.new ProtectedInnerClass(); // works fine, too.
}It's section 6.6.2.2 that describes this behavior, as I quoted above. The last bullet point of that section reads (to repeat): "A protected constructor can be accessed by a class instance creation expression (that does not declare an anonymous class) only from within the package in which it is defined."
~ -
How can Anonymous class inherit ?
I am not much fluent with Inner Classes concept.Only today i read that
"An anonymous class may implement an interface or extend a superclass, but may not be declared to do both. "
JLS Classes Page also couldn't fetch me my answer or may be i could not spot it.I think latter.
I think a in depth study of Inner Classes,Anonymous classes can get me my answer. Can anyone give me any pointers that would clear my doubt ?
Thank you for your consideration.
Edited by: amtidumpti on May 1, 2009 12:58 AMamtidumpti wrote:
I am not much fluent with Inner Classes concept.Only today i read that
"An anonymous class may implement an interface or extend a superclass, but may not be declared to do both. "
JLS Classes Page also couldn't fetch me my answer or may be i could not spot it.I think latter.
http://java.sun.com/docs/books/jls/third_edition/html/classes.html
I think a in depth study of Inner Classes,Anonymous classes can get me my answer. Can anyone give me any pointers that would clear my doubt ?
Thank you for your consideration.Start writing an anonymous class and you should readily see why it can't do both.
Have you even tried to implement an anonymous class yet? Please clear my doubt. -
How to create custom attributes & object classes through ldif files in OID
Hi,
I have to create 4 attributes and one object class(custom) in OID. I want to creae these attributes and object class through LDIF file.
I tried creating an attribute through this command
ldapadd -p 389 -h localhost -D cn=orcladmin -w password -f D:/newattr.ldif
this ldif file contains inf. for creating a new attributes:
dn: cn=subschemasubentry
changetype: add
add: attributetypes
attributetypes: ( 1.2.3.4.5.6.10 NAME "xsUserType_new" DESC "User Type Definition" EQUALITY caseIgnoreMatch
SYNTAX "1.3.6.1.4.1.1466.115.121.1.15" )
I am getting error: Object class violation
Failed to find add in mandatory or optional attribute list.
Please help to find where I am going wrong...
Thanks.Hi Ajay,
Thank you for the help. Now i am able to create both attributes and object classes in OID through Ldif files.
I was getting constraint violation error because (I think) I was not giving proper naming convection for attributes and object classes. For OID, there are certain Ldap naming conventions. They are as follows:
# X below is the enterprise number assigned by IANA
1.3.6.1.4.1.X.1 - assign to SNMP objects
1.3.6.1.4.1.X.2 - assign to LDAP objects
1.3.6.1.4.1.X.2.1 - assign to LDAP syntaxes
1.3.6.1.4.1.X.2.2 - assign to LDAP matchingrules
1.3.6.1.4.1.X.2.3 - assign to LDAP attributes
1.3.6.1.4.1.X.2.4 - assign to LDAP objectclasses
1.3.6.1.4.1.X.2.5 - assign to LDAP supported features
1.3.6.1.4.1.X.2.9 - assign to LDAP protocol mechanisms
1.3.6.1.4.1.X.2.10 - assign to LDAP controls
1.3.6.1.4.1.X.2.11 - assign to LDAP extended operations
By using these conventions for attributes and object class, I did got any error and they were created in OID.
Thanks a zillion.
Kalpana. -
Calling super.method() from anonymous class
Look at this:
class SynchronizedListModel
extends DefaultListModel
public void addElement(Object obj) {
final Object fObj = obj;
Runnable rAdd = new Runnable()
public void run() {
super.addElement(fObj);
if (SwingUtilities.isEventDispatchThread()) {
rAdd.run();
} else {
SwingUtilities.invokeLater(rAdd);
}super in super.addElement(fObj); does not reference the addElement(obj) method of the DefaultListModel but of Object. So the compiler throws an error.
How can I call the addElement method of DefaultListModel in the inner Runnable-class?
Thanks for your help
UlrichI use a more compact semi-recursive form
class SynchronizedListModel
extends DefaultListModel
public void addElement(final Object obj)
if (SwingUtilities.isEventDispatchThread())
super.addElement(obj);
else
SwingUtilities.invokeLater(new Runnable()
addElement(obj);
}This is not true recursion because call the to addElement() is done in the Swing event thread not in the calling thread. -
Bug? Unable to add ActionListener using Anonymous class.
Hi,
I come accross one strange behaviour while adding ActionListener to RCF component.
I am trying to add the ActionListener in the managed bean using the Anonymous.
We can add the actionListener to a button using following methods. I am talking about the the first case. Only this case is not working. Rest other 2 cases are working properly.
Case 1:
class MyClass {
RichCommmandButton btnTest = new RichCommmandButton();
public MyClass(){
btnTest.addActionListener(new ActionListener(){
public void processAction(ActionEvent event){
Case 2:
class MyClass implements ActionListener {
RichCommmandButton btnTest = new RichCommmandButton();
public void processAction(ActionEvent event){
<af:button binding="#{myClassBean.btnTest}" actionListener="#{myClassBean.processAction}"/>
Case 3:
class MyClass implements ActionListener {
RichCommmandButton btnTest = new RichCommmandButton();
public void addActionLister(){
//Use EL to add processAction(). Create MethodBinding
FacesContext facesContext = FacesContext.getCurrentInstance();
ELContext elContext = facesContext.getELContext();
ExpressionFactory exprfactory = facesContext.getApplication().getExpressionFactory();
MethodExpression actionListener =
exprfactory.createMethodExpression(elContext, "#{myClassBean.processAction}", null, new Class[] { ActionEvent.class });
btnTest.setActionListener(actionListener);
public void processAction(ActionEvent event){
Java has provided good way to use the Anonymous classes while adding the listeners. It should work with the RCF also.
Some how i found the case 1 usefull, as i can have as many buttons in my screen and i can add the actionListener in one method. Also it is easy to read. I dont have to see the JSPX page to find the associated actionListener method.
Is it a bug or i am wrong at some point?
Any sujjestions are welcome.
- Sujay.Hello Sujay,
As I said in my previous reply, you can try with request scope. In JSF you shouldn't use the binding attribute very often. I agree that anonymous class is nice, but don't forget that you might be dealing with client state saving here so it cannot be perfectly compared with Swing that maintains everything in RAM. What I think happens with you currently is the following:
1. Bean is created and the button instance as well. The ActionListener is added to the button;
2. The view is rendered and while it is, the binding attribute is evaluated, resulting in the get method of your bean being called;
3. Since the method returns something different than null, the button instance created in 1. get used in the component tree;
4. The tree's state is saved on the client, since your class isn't a StateHolder, nor Serializable, the StateManager doesn't know how to deal with it so it gets discarded from the saved state and maybe from the component itself (would have to debug the render view phase to be sure);
5. The postback request arrives, the tree is restored. When the handler reaches the button, it call the bean that returns the same instance that was used in the previous tree (since not request scoped), which is BAD because the remaining of the tree is not made of the same object instances, but rather new deserialized ones. The component then gets updated from the client state saved in 4, this might also be where the listener get removed (again debugging would tell you this, but I would tend more with the previous possibility). Note that with a request scoped bean you would have to add the listener during the first get method call (by checking if the component is null) or in the constructor as you're doing right now. It would be a very clean way and you could give the request bean (and thus the listener) access to the conversation scoped bean through injection which is very nice as well.
6. The invoke application phase occurs and the listener is no longer there.
Btw, this isn't a rich client issue, more a specification one. I'm curious if it works in a simple JSF RI application, if it does then I guess it would be a bug in Trinidad and/or rich client state handling architecture (using FacesBean).
Regards,
~ Simon -
How to override a method in an inner class of the super class
I have a rather horribly written class, which I need to adapt. I could simply do this if I could override a method in one of it's inner classes. My plan then was to extend the original class, and override the method in question. But here I am struggling.
The code below is representative of my situation.
public class ClassA
ValueChecks vc = null;
/** Creates a new instance of Main */
public ClassA()
System.out.println("ClassA Constructor");
vc = new ValueChecks();
vc.checkMaximum();
// I want this to call the overridden method, but it does not, it seems to call
// the method in this class. probably because vc belongs to this class
this.vc.checkMinimum();
this.myMethod();
protected void myMethod()
System.out.println("myMethod(SUPER)");
protected class ValueChecks
protected boolean checkMinimum()
System.out.println("ValueChecks.checkMinimum (SUPER)");
return true;
protected boolean checkMaximum()
return false;
}I have extended ClassA, call it ClassASub, and it is this Class which I instantiate. The constructor in ClassASub obviously calls the constructor in ClassA. I want to override the checkMinimum() method in ValueChecks, but the above code always calls the method in ClassA. The ClassASub code looks like this
public class ClassASub extends ClassA
public ClassAInner cias;
/** Creates a new instance of Main */
public ClassASub()
System.out.println("ClassASub Constructor");
protected void myMethod()
System.out.println("myMethod(SUB)");
protected class ValueChecks extends ClassA.ValueChecks
protected boolean checkMinimum()
System.out.println("ValueChecks.checkMinimum (SUB)");
return true;
}The method myMethod seems to be suitably overridden, but I cannot override the checkMinimum() method.
I think this is a stupid problem to do with how the ValueChecks class is instantiated. I think I need to create an instance of ValueChecks in ClassASub, and pass a reference to it into ClassA. But this will upset the way ClassA works. Could somebody enlighten me please.vc = new ValueChecks();vc is a ValueChecks object. No matter whether you subclass ValueChecks or not, vc is always of this type, per this line of code.
// I want this to call the overridden method, but it does not, it seems to > call
// the method in this class. probably because vc belongs to this class
this.vc.checkMinimum();No, it's because again vc references a ValueChecks object, because it was created as such.
And when I say ValueChecks, I mean the original class, not the one you tried to create by the same name, attempting to override the original. -
Static variables in anonymous classes ..
How can i access a static variable from an anonymous class ..
class A{
outerMeth(){
Interface anon=new Interface(){
static int i;
// how can i acess 'i' ..
thanx in advance ..sorry .. not a valid question ..
static var are not allowed in anonymous/inner classes ..
sorry ..
ignore this one ..
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