Decorate window of class extending JFrame

Hello,
I have a class that extends JFrame and I'd like to set it's look decorated the same way that it does when a new JFrame is built inside the code. Currently it's got the regular Java look (if I create a JFrame somewhere in the code it has the look I want), the following code didn't help, it only sets the subsequently created JFrames decorated:
    GUI frame = new GUI(); //GUI extends JFrame
    UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
    frame.setDefaultLookAndFeelDecorated(true);

Thanks for your reply. I already read that, in fact the section "Programmatically Setting the Look and Feel " instructs to write the code I posted on the previous post. I also tried:
UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
SwingUtilities.updateComponentTreeUI(this);And it didn't work. The main frame has the regular LNF and subsequently created JFrames will have the javax.swing.plaf.metal.MetalLookAndFeel
Also, after the code I posted on my previous post, GUI.isDefaultLookAndFeelDecorated() returns true.
Thanx in advance! :)

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Which is better? Extend JFrame or Wrap it in a class???

Just a random thought, have been programming swing for a long time now and during the time have been researhed a lot of swing examples on web and found out that most people tend to make a class extend JFrame in order to use it stuff.
However the way i've been programming is to wrap it around a class by creating an instance of JFrame inside my class. In that way i feel is more easier to program.
But which is better style of programming and which is better programming technique in terms of robustness, reusablitity & good general programming practice?

The usual answer, it depends. If you don't want to change a JFrame's behaviour, you wrap it. If the JFrame class is lacking a feature you need, you extend it and implement the desired feature.

Getting grid layout to work with a class that extends JFrame

In my code, I have a class extending JFrame and setting the layout to grid works and the code to add with three parameters compiles just fine but when I run it I get this:
java.lang.IllegalArgumentException: illegal component position
     at java.awt.Container.addImpl(Container.java:999)
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     at javax.swing.JFrame.addImpl(JFrame.java:479)
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on the add(myLabel, 1, 1); line

I see on these from
http://java.sun.com/j2se/1.5.0/docs/api/java/awt/Container.html#add(java.awt.Component)
1.public Component add(Component comp)
2.public Component add(String name, Component comp)
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Extending JFrame

Hi Everyone, I want to create my own utility class named as MyJFrame which will extend the JFrame, so that I can extend MyJFrame instead of JFrame while creating any application. My application will not use the JFrame, instead it will use the MyJFrame, but still I should be able to do all the things which we generally do while developing any application using JFrame.
I want to do this because I want to provide some more operations to a application developer along with the JFrame.
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nikhil_shravane wrote:
one of them may be MyJFrame extends JFrame, but still no idea what to do further so that MyJFrame will have all the behaviors of JFrame. ?
suggest me other ideas also.If your class extends JFrame, it will automatically have all of the "behaviors" of JFrame. What functionality do you think you will lose by extending the class? You are being very vague in your question; please provide a specific question or concern or you might not get much help.
As Encephalopathic says, many people will advise you not to extend JFrame at all, telling you to google [Composition vs. Inheritance|http://www.javaworld.com/javaworld/jw-11-1998/jw-11-techniques.html]. However if you really insist on going the "inheritance" route, I'd suggest extending JRootPane as opposed to JFrame. JRootPane provides all of the functionality you really use in an appliction (menu bar, manages the content pane, glass pane, etc.), and extending and using it as your base class for a generic "application" would allow you to shove your "application base" into JApplets as well as JFrames.

Class extends question

Hi Ive written a program in java3D and my class extends JFrame because i using swing for my GUI however i now want to use the mouse picking thing in java to click on shapes on my canvas which i see isnt 'too' hard but i cant now extend a second thing can i? is there a way around it? the code below is exactly what i want but it extends MouseAdapter which mine cant ?
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import com.sun.j3d.utils.universe.SimpleUniverse;
import com.sun.j3d.utils.geometry.*;
import javax.media.j3d.*;
import javax.vecmath.*;
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hi,
first, you don't have to extend JFrame (even it seems convenient), try to honor the composition over the inheritance. second, if you listen to key or mouse events, usually it's enough and perfectly ok to implement proper listener interface and then implement its methods (fulfill the contract).
what you did (extnding some mouse listener) i would assume that you're trying to implement a new mouse listener with specific behavior. but what you actually want is just to use it.
this question is "on the edge" since it involves some general design decisions (so it could be in java programming section) and at the same time it touches the j3d apis (so it can be here).
hope it helped;)

Invoke a panel object in a class which extends JFrame

I have a class LoginUI which extends JFrame and another class NewUserUI which extends JPanel. The LoginUI contains a button which when clicked should display the NewUserUI panel in a separate window. How should I invoke the NewUserUI object in the LoginUI class?

One possibility would be the use of a JOptionPane containing the JPanel.
Cheers
DB

Japplet is not able to call a class that extends JFrame in internet Explore

Hi
I am doing an application on Japplet.The Japplet class calls anathor class which extends JFrame.When I am running this appication on Applet Viewer it works fine.but when I am running this aplication in internet Explorer the Frame window doesn't come.What might be the problem.
Thanks
Srikants

There is no error or exceptio comming when i am running that application on Internet Explorer.Convert the html page to use the object tag instead of the applet tag.
The IE build in jre (called msjvm) cannot display JFrame since the version is
1.1.2 and it has no javax classes.
Still problems?
A Full trace might help us out:
http://forum.java.sun.com/thread.jspa?threadID=656028

Adding a JPanel from one class to another Class (which extends JFrame)

Hi everyone,
So hopefully I go about this right, and I can figure out what I'm doing wrong here. As an exercise, I'm trying to write a Tic-Tac-Toe (TTT) game. However, in the end it will be adaptable for different variations of TTT, so it's broken up some. I have a TTTGame.java, and TTTSquareFrame.java, and some others that aren't relavent.
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import java.awt.event.*;
import javax.swing.*;
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import java.awt.event.*;
import javax.swing.*;
import joshPack.jUtil.Misc;
public class TTTSquareFrame
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}I've successfully added panels to JFrame within the same class, and this is the first time I'm modularizing the code this way. The issue is that the frame comes up blank, and I get the message "Something's wrong" and it says the addPanel is invalid. Originally, the panel creation was in the constructor for TTTSquareFrame, and I just added the mainSquare (from TTTGame class) to the content pane, when that didn't work, I tried going about it this way. Not exactly sure why I wouldn't be able to add the panel from another class, any help is greatly appreciated.
I did try and cut out code that wasn't needed, if it's still too much let me know and I can try and whittle it down more. Thanks.

Yea, sorry 'bout that, I just cut out the parts of the files that weren't relevant but forgot to compile it just to make sure I hadn't left any remnants of what I had removed. For whatever it's worth, I have no idea what changed, but something did and it is working now. Thanks for your help, maybe next time I'll post an actual question that doesn't somehow magically solve itself.
EDIT: Actually, sorry, I've got the panel working now, but it's tiny. I've set the minimum size, and I've set the size of the panel, so...why won't it respond to that? It almost looks like it's being compressed into the top of the panel, but I'm not sure why.
I've compressed the code into:
TTTGame.java:
import java.awt.*;
import javax.swing.*;
public class TTTGame extends JFrame
     private Integer sides = 3;
     private TTTSquareFrame mainSquare;
     private TTTGame newGame;
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          mainSquare = new TTTSquareFrame(sides.intValue());
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          setSize(400, 400);
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}TTTSquareFrame.java
import java.awt.*;
import javax.swing.*;
public class TTTSquareFrame extends JPanel
     private JButton [] squares;
     private int square, index;
     private final Dimension testSize = new Dimension(50, 50);
     public TTTSquareFrame(int size)
          super();
          square = (int)Math.pow(size, 2);
          super.setLayout(new GridLayout(size, size));
          squares = new JButton[square];
          for(int i = 0; i < square; i++)
               squares[i] = new JButton();
               squares.setMinimumSize(testSize);
               squares[i].setVisible(true);
               super.add(squares[i]);
          setSize(200, 200);
          setVisible(true);
I've made sure the buttons are smaller than the size of the panel, and the panel is smaller than the frame, so...
Message was edited by:
macman104

Why we extends JFrame class in java

Hello Java Developers,
I am new to Java & Currently I am trying my hands on Java Swings.
I wrote a very simple program in Java to display a JFrame on screen. My code is as follows:
import javax.swing.*;
public class JavaFrame {
public static void main(String args[]){
JFrame frame = new JFrame();
frame.setTitle("My Frame");
frame.setSize(400, 150);
frame.setLocation(300, 300);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
I saw some examples on internet & they are extending "JFrame" in their every example. I want to know what is the benefit of this ??? here is code:
import javax.swing.*;
public class JavaFrame extends JFrame {
public static void main(String args[]){
JFrame frame = new JFrame();
frame.setTitle("My Frame");
frame.setSize(400, 150);
frame.setLocation(300, 300);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
My second question is what is the meaning of line "frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);"
frame - This object of class created by me.
setDefaultCloseOperation() - This is predefined method in JFrame class.
JFrame.EXIT_ON_CLOSE - what is the meaning of this ??

I saw in JFrame API as you suggested & I found that
EXIT_ON_CLOSE is an "public static final" method.Look again. It's not a method.
final: this mehod must be executed
am I right ???No. final means that the value cannot be reassigned.
Use code tags to post codes -- [code]CODE[/code] will display asCODEOr click the CODE button and paste your code between the {code} tags that appear.
db

Retrieve method from class which extends JFrame

hi, i need some help with my program.
I have two class which both extends JFrame. The first class called security class and second class is available class.
In the SECURITY class, i create a button to operate the AVAILABLE class and it generate a result in method Count(). I want to view the result in Frame SECURITY by calling method count() but i could manage to do it. Could somebody help me how to manage this problem?
Thanks.

may be you could create a instance of the class you wanted to access method from or pass the instance from one class to another.
like this:
public class A extends JFrame
public B newB= new B();
public A(){}
public void someMethod()
newB.someOtherMethod();
public class B extends JFrame
public B(){}
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i hope it is what you are looking for

Visual Editor cannot show the class extending a visual class of JFrame

Hi,
We want to create a base frame (BaseFrame) so that every form in our application extending it to share some common properties.
But i found that the class (OrderFrame extends BaseFrame) cannot be shown properly in Visual Editor (run is ok).
Is there any way to resolve it?
Code Ref:
BaseFrame.java
public class BaseFrame extends JFrame {
public BaseFrame() {
try {
jbInit();
} catch (Exception e) {
e.printStackTrace();
private void jbInit() throws Exception {
this.getContentPane().setLayout( null );
this.setSize( new Dimension(400, 300) );
this.setTitle( "Standard JFrame" );
OrderFrame.java
public class OrderFrame extends BaseFrame {
public OrderFrame() {
try {
jbInit();
} catch (Exception e) {
e.printStackTrace();
private void jbInit() throws Exception {
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Olaf,
When using your own beans it is best to create the bean in one project, and then use it in a second project. So in your example; use Project1.jpr to create, compile, test, debug BaseFrame.java. Then, once you are satisfied with it, use Project2.jpr to create, compile, test, debug MyInternalFrame.java. Your scenario works fine when adopting this approach. However, be sure that MyInternalFrame.java includes the necessary import statement for BaseFrame, and be sure that the classpath for Project2.jpr includes the path to BaseFrame.class. If you are using the default classpath settings for each project (i.e. myclasses) then the classpath concern will be taken care of for you already.
Enjoy.
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by olaf:
Hi,
the situation :
BaseFrame extends JInternalFrame
and
MyInternalFrame extends BaseFrame
Now I want to edit MyInternalFrame in the visual editor.
I tried that by making a bean of BaseFrame and addiing the bean to the Palette but MyInternalFrame won't show up in the editor,
anybody knows how to set this up ?
Thanks,
-- olaf<HR></BLOCKQUOTE>
null

Catching window closing events from JFrame

I'm having problems catching windowClosing() events from a JFrame (just doesn't get to my event listener it would seem!).
I register and setup a window listener in the constructor of my JFrame class. Prior to this I set the default close operation as DO_NOTHING_ON_CLOSE (as you're suppose to if tyou want to handle window closing events).
When user clicks on x (window terminate) button (in WIN systems), nothing is dispatched to my event listener. Any ideas?
Extract from constructor:
setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
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class MainWindowListener extends WindowAdapter
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this.f = f;
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System.out.println("gets here...");
f.ReturnResources();
f.dispose();
System.exit(0);
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This works for meimport java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Test extends JFrame {
public Test() {
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Thanks for some debugging help

I'll get back to you in a moment, in the meantime I've got a work around solution. I did the testing/application in a single class, by calling the constructor in the main method:
package project2;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
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Hello,
I wondered if anyone could advice, I am trying wrote a class which lowers the border of a jbutton when the button is clicked, and stays lowered until clicked again. In the sameway as bold does in ms word.
I understand I can use setBorder(raised) or setBorder(lowered).
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Thank you
public class AddButton extends JButton implements MouseListener{
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public void mouseMoved(MouseEvent e) { }
public void mouseExited(MouseEvent e) { }
public void mouseReleased(MouseEvent e) { }
public void mouseEntered(MouseEvent e) { }
public void mousePressed(MouseEvent e) { }
public void mouseDragged(MouseEvent e) { }
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import java.awt.*;
import javax.swing.border.Border;
import java.awt.event.*;
import javax.swing.*;
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public static void main(String[] arghs) { new Test3(); }
}

Why we extend JFrame in java swings? how is it different from code not ...?

how is it different from code nt extending JFrame?
please explain the role of contentpane in both cases?
thanx

Search the net for examples and/or explanations of "inheritance vs composition.
For the role of a contentPane, read the API for interface RootPaneContainer and class JRootPane. The second named API also has a link to the Swing tutorial on How to Use Root Panes.
db

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