I have came across many situation where I needed to pass value to an other thread and I founded out that I could do it this way, but I have been wondering how is it working ? public void method() { final EventHandler handle = someReference; Thread thread = new Thread() { public void run() { handle.onEvent();...
I have a code like this: class Foo() { time_to_play = 0 class Bar() { void change_player() { //I need something HERE } } } And I need to change the attribute time_to_play from class Foo, but make this change from inside the method change_player(), that is under class Bar. I cannot declare clas...
enumeration e=vector.elements But vector class does not implement Enumeration, then how comes it is returning Enumeration Reference. But e is refering to java.util.vector$1 . What is "Vector$1"??? ...
I am writing a file that can parse rdf and owl files. I am using SAX and Java. My problem is on the line activeObject.add(file); I get the error "Syntax error on tokens, Misplaced construct(s)" - I don't know what this means. And it doesn't seem to make sense, any help would be much appreciated. PS: I might be completely wrong about w...
Here's the code: protected Dialog onCreateDialog(int id) { Dialog dialog = null; if (id == DIALOG_SEARCH) { dialog = new Dialog(this); dialog.setContentView(R.layout.search_dialog_layout); dialog.setTitle("Search Dialog"); Button button = (Button) dialog.findViewById(R.id.Button01); final ...
In many application I often have algorithms which make use of dedicated sub-algorithms (or simply well defined pieces of code). Till now, when I wrote the main algorithm, i created a private method for each sub-algorithm like in the example below (OldStyle): public class OldStyle { public int mainAlg() { int x = subAlg01(...
Can someone tell me what the purpose of having inner classes? I can think of a few but may be they are not good reasons for using inner classes. My reasoning is that inner class is helpful when you want to use a class that no other classes can use. What else? ...
Hi coders, In all the Java source code examples I have looked at the listeners have always been declared in inner classes. Why - what is the reason for coding the classes like this instead of having the listener(s) in their own seperate *.java file \ class? Would having seperate classes for the listeners be considered a bad design? I...
Hey, I'm working on a simple android live wallpaper, I'm following chapter 12 from Hello, Android as my guide. The bare-bones of a wallpaper service looks like this: public class MyWallpaper extends WallpaperService { private class MyEngine extends Engine { //... } //... } According to the book MyEngine m...
As i clearly mentioned above, I would be glad to hear your ideas about that. btw, some other ones say; "call Component.getInstance(Facade,true) from your inner class." However, I dont understand it actually.. Thanks ...
What is the use of an inner class in a Java server side application? Please explain the benefits other than Swing component containment hierarchy using inner class. ...
I have developed a server-to-server protocol called CCMN and different drop policies for the messages cached by each server. The PEERSIM simulator creates a template node with the CCMN protocol and then clones this template node. The CCMN class includes different data structures maintaining the states required to implement the drop po...
Hello, I am trying to make a GUI in Java, using something along these lines: public class GUIApp { DrawingPanel dp; buttonPanel bp; ova = Oval; public GUIApp() { JFrame win = new JFrame("Drawing App"); dp = new DrawingPanel(); bp = new buttonPanel(this); //Settings for panels and frame ...
I have a lot of objects of type ContainedClass stored in an object of type ContainingClass. I need to access the container object from the inside objects. As of now I am doing this by passing a reference to the container object in the constructor of the other objects like ContainedClass cclass = new ContainedClass(this); and storing it a...
For a CS class I am writing a linked list implementation of a linked list interface created by my professor. The assignment requires us to use generics for the list. What I have created, I think, is pretty standard. public class MyLinkedList<T> implements ADTListInterface { ... private class Node<T> { Node<T> head; ...
I'm trying to create an array of JLabels, all of them should go invisible when clicked. The problem comes when trying to set up the mouse listener through an inner class that needs access to the iteration variable of the loop used to declare the labels. Code is self-explanatory: for(int i=1; i<label.length; i++) { label[i] = ...
final JTextField jtfContent = new JTextField(); btnOK.addActionListener(new java.awt.event.ActionListener(){ public void actionPerformed(java.awt.event.ActionEvent event){ jtfContent.setText("I am OK"); } } ); If I omit final, I see the error "Cannot refer to a non-final variable jtfContent insid...
Hello everyone, I have a question about sharing queues between processes in Python. Below, I have three queues, one main process, and three inner processes. Each inner process will be adding and getting values from the various queues (they need easy access to the queues). I think it works as it is right now, but this code is the found...
I can understand what inner class is and how to write program. My question is in what situation do programmers really need inner class? ...
Is declaring a class that extends Activity inside another Activity class possible? If it is, how would I register that class in the manifest? Also, is that something that can be reasonably done or is it a bad idea? I was thinking of something like class ListClass extends ListActivity{ ... ArrayList items; class ItemClass ...