e614. Setting the Initial Focused Component in a Window
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.
// Create frame and three buttons
JFrame frame = new JFrame();
JButton component1 = new JButton("1");
JButton component2 = new JButton("2");
JButton component3 = new JButton("3"); // 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);
}
}
}
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