i asked a similar question some time ago, see Swing desktop-development if you are interested. My conclusion was/is that there simply are no frameworks that can do for your desktop-application, what any of the bazillion great WEBframeworks can do for your webapplication. It seems absurd, but in my experience due to the great web-frameworks and … Read more
I think LayeredPane is your best bet here. You would need a third panel though to contain A and B. This third panel would be the layeredPane and then panel A and B could still have a nice LayoutManagers. All you would have to do is center B over A and there is quite a … Read more
Closing a window (with dispose()) and hiding it (with setVisible(false)) are different operations, and produce different events — and closing it from the operating system is yet another different operation that produces yet a different event. All three will produce windowDeactivated to tell you the window’s lost focus, but dispose() will then produce windowClosed, while … Read more
If you have only put (non-null) String references in the JComboBox, then either way is fine. However, the first solution would also allow for future modifications in which you insert Integers, Doubless, LinkedLists etc. as items in the combo box. To be robust against null values (still without casting) you may consider a third option: … Read more
A JNI global reference is a reference from “native” code to a Java object managed by the Java garbage collector. Its purpose is to prevent collection of an object that is still in use by native code, but doesn’t appear to have any live references in the Java code. A JFrame is a java.awt.Window, and … Read more
Also possible: final Timer timer = new Timer(10, null); timer.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { (as in the question, except that you can refer to timer here) } }); Or, use the event object to get the source (and cast it, boo): final Timer timer = new Timer(10, new ActionListener() { public void … Read more
AWT, override paint(). Swing top-level container (e.g.s are JFrame, JWindow, JDialog, JApplet ..), override paint(). But there are a number of good reasons not to paint in a TLC. A subject for a separate question, perhaps. The rest of Swing (any component that derives from JComponent), override paintComponent(). Neither override nor explicitly call paintComponents(), leave … Read more
It is possible. KeyboardFocusManager.getCurrentKeyboardFocusManager() .addKeyEventDispatcher(new KeyEventDispatcher() { @Override public boolean dispatchKeyEvent(KeyEvent e) { System.out.println(“Got key event!”); return false; } }); That will grab all key events. Returning false allows the keyboard focus manager to resume normal key event dispatching to the various components. If you want to catch key combos, you can keep a set … Read more
Simply the code is jLabel1.setForeground(Color.red);
Swing is still in use…. but there is AWT!! AWT: Pros: Speed: use of native peers speeds component performance. Look and Feel: AWT components more closely reflect the look and feel of the OS they run on. Cons: Portability: use of native peers creates platform specific limitations. Some components may not function at all on … Read more