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<TITLE>Setting the Initial Focused Component in a Window
(Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
<META CONTENT="Code Examples from The Java Developers Almanac 1.4" NAME="DESCRIPTION">
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<B><A HREF="../java.awt/pkg.html#Focus">Focus</A></B><font color="#666666" SIZE="-2">
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<h3>
e618.
Setting the Initial Focused Component in a Window</h3>
There is no straightforward way to set the initial focused
component in a window. The typical method is to
add a window listener to listen for the window opened
event and then make the desired component request the focus.
<pre>
// Create frame and three buttons
JFrame frame = new JFrame();
JButton component1 = new JButton(<font color="#0066ff"><i>"1"</i></font>);
JButton component2 = new JButton(<font color="#0066ff"><i>"2"</i></font>);
JButton component3 = new JButton(<font color="#0066ff"><i>"3"</i></font>);
// Set component with initial focus
// Must be done before the frame is made visible
InitialFocusSetter.setInitialFocus(frame, component2);
class InitialFocusSetter {
public static void setInitialFocus(Window w, Component c) {
w.addWindowListener(new FocusSetter(c));
}
public static class FocusSetter extends WindowAdapter {
Component initComp;
FocusSetter(Component c) {
initComp = c;
}
public void windowOpened(WindowEvent e) {
initComp.requestFocus();
// Since this listener is no longer needed, remove it
e.getWindow().removeWindowListener(this);
}
}
}
</pre>
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Related Examples
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e610. <a class="eglink" href="focus_FindFocus.html?l=rel">
Determining Which Component or Window Has the Focus
</a>
<br>
e611. <a class="eglink" href="focus_NoFocus.html?l=rel">
Preventing a Component from Gaining the Focus
</a>
<br>
e612. <a class="eglink" href="focus_NoFocusWindow.html?l=rel">
Preventing a Window from Gaining the Focus
</a>
<br>
e613. <a class="eglink" href="focus_FocusEvents.html?l=rel">
Listening to All Focus Changes Between Components in an Application
</a>
<br>
e614. <a class="eglink" href="focus_FocusTravKeyComp.html?l=rel">
Setting Focus Traversal Keys in a Component
</a>
<br>
e615. <a class="eglink" href="focus_FocusTravKey.html?l=rel">
Setting Focus Traversal Keys for the Entire Application
</a>
<br>
e616. <a class="eglink" href="focus_FocusTrans.html?l=rel">
Moving the Focus to the Next or Previous Focusable Component
</a>
<br>
e617. <a class="eglink" href="focus_NextFocus.html?l=rel">
Modifying the Focus Traversal Order
</a>
<br>
e619. <a class="eglink" href="focus_FindNextFocus.html?l=rel">
Finding the Next Focusable Component
</a>
<br>
e620. <a class="eglink" href="focus_TempFocus.html?l=rel">
Determining If a Focus Lost Is Temporary or Permanent
</a>
<br>
e621. <a class="eglink" href="focus_OppositeFocus.html?l=rel">
Determining the Opposite Component of a Focus Event
</a>
<br>
e622. <a class="eglink" href="focus_ValidateFocus.html?l=rel">
Validating a JTextField When Permanently Losing the Focus
</a>
<br>
e623. <a class="eglink" href="focus_RemoveFocus.html?l=rel">
Removing the Focus from the Application
</a>
<br>
e624. <a class="eglink" href="focus_WindowFocus.html?l=rel">
Activating a Keystroke When Any Component in the Window Has Focus
</a>
<br>
e625. <a class="eglink" href="focus_ChildFocus.html?l=rel">
Activating a Keystroke When Any Child Component Has Focus
</a>
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See also:
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Colors">
Colors
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Components">
Components
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Containers">
Containers
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Cursors">
Cursors
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Drawing">
Drawing
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Events">
Events
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Frames">
Frames
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#GridBagLayout">
GridBagLayout
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Images">
Images
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Shapes">
Shapes
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Simulating%20Events">
Simulating Events
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#Text">
Text
</a>
<a class="eglink" href="/egs/java.awt/pkg.html?l=rel#The%20Screen">
The Screen
</a>
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