JFrame is a normal window with its normal buttons (optionally) and decorations. JDialog on the other side does not have a maximize and minimize buttons and usually are created with JOptionPane static methods, and are better fit to make them modal (they block other components until they are closed). But both inherit from Window, so … Read more
The documentation tells me, that this behavior is platform dependent. Especially, since the following example code works for me as desired in Windows Vista: import java.awt.Dimension; import javax.swing.JFrame; public class JFrameExample { public static void main(String[] args) { JFrame frame = new JFrame(“Hello World”); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setMinimumSize(new Dimension(100, 100)); frame.setVisible(true); } }
You must call private JFrame frame = new JFrame(); … … frame.getContentPane().removeAll(); frame.repaint(); removeAll() has not been overridden as add() or remove() to forward to the contentPane as necessary.
Typical views for this Windows 7 based PC Note: @bobbel reports the same sizes are used for Windows 10. Frame – 20×20 Task Bar – 40×40 in task bar itself, hover app shows 20×20 Windows+Tab – 20×20 Alt+Tab – 40×40 in lower right, shrunken 20×20 in upper left. Task Manager – 20×20
Try this. addWindowListener(new WindowAdapter() { @Override public void windowClosing(WindowEvent e) { System.out.println(“Closed”); e.getWindow().dispose(); } });
minimize with frame.setState(Frame.ICONIFIED) restore with frame.setState(Frame.NORMAL)
On the JDialog you’ve created you should call pack() first, then setLocationRelativeTo(parentFrame), and then setVisible(true). With that order the JDialog should appear centered on the parent frame. If you don’t call pack() first, then setting the location relative to the parent doesn’t work properly because the JDialog doesn’t know what size it is at that … Read more
It’s not two competing mechanisms – a JPanel is a Container (just look at the class hierarchy at the top of the JPanel javadocs). JFrame.getContentPane() just returns a Container to place the Components that you want to display in the JFrame. Internally, it’s using a JPanel (by default – you can change this by calling … Read more
System.exit(); causes the Java VM to terminate completely. JFrame.dispose(); causes the JFrame window to be destroyed and cleaned up by the operating system. According to the documentation, this can cause the Java VM to terminate if there are no other Windows available, but this should really just be seen as a side effect rather than … Read more
Make it not resizable: frame.setResizable(false); You will still have the minimize and close buttons.