Setting the Maximum size of a JFrame while launching the application

Question

I want to set the Maximum size of the JFrame while launching the application. Problem is, if the screen resolution is more my frame is getting bigger , but at that time it should not cross the max range defined, but same case works fine with low resolution.

Like I want my frame to be of Maximum of (500,500) , so I wrote this piece of code:

JFrame frame = new JFrame("FRAME TRANSPARENT");
frame.setSize((int)(Toolkit.getDefaultToolkit().getScreenSize().getWidth()-50), (int)(Toolkit.getDefaultToolkit().getScreenSize().getHeight()-150));
frame.setMaximizedBounds(new Rectangle(0,0 , 500, 500)); 
frame.setVisible(true);

Even I set the Bound, the JFrame is considering setSize method and it seems to be that it is neglecting the setMaximizedBounds method. I already tried with setMaximumized method but got the same output.

Answer 1

I tried it and you're so right that setMaximumSize() doesn't work.. all these years couldn't get to know that!!! Mostly my requirements of limiting size is fixed by setResizable(false), although I see you have specific query of minimum and maximum sizes to be different

Worked on a solution for you though:

public class MaxSizeUI
{
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new MaxSizeUI().makeUI();
            }
        });
    }

    public void makeUI() {
        final JFrame frame = new JFrame("Sample Fram") {

            @Override
            public void paint(Graphics g) {
                Dimension d = getSize();
                Dimension m = getMaximumSize();
                boolean resize = d.width > m.width || d.height > m.height;
                d.width = Math.min(m.width, d.width);
                d.height = Math.min(m.height, d.height);
                if (resize) {
                    Point p = getLocation();
                    setVisible(false);
                    setSize(d);
                    setLocation(p);
                    setVisible(true);
                }
                super.paint(g);
            }
        };
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 150);
        frame.setMaximumSize(new Dimension(400, 200));
        frame.setMinimumSize(new Dimension(200, 100));
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}

Answer 2

One possible solutions is:

Dimension DimMax = Toolkit.getDefaultToolkit().getScreenSize();
frame.setMaximumSize(DimMax);

frame.setExtendedState(JFrame.MAXIMIZED_BOTH);