JFrame and Nimbus Look And Feel

Question

I use Nimbus Look and Feel in a project. However, although every GUI JComponent have a Look and Feel of Nimbus, JFrame always have Windows Look and Feel.

How can JFr

Answer 1

Confirming @Andrew's suspicion, setDefaultLookAndFeelDecorated() says that, when supported, "newly created JFrames will have their Window decorations provided by the current LookAndFeel." I changed the size to see the whole title.

import javax.swing.*;

class FrameLook {

    public static void showFrame(String plaf) {
        try {
            UIManager.setLookAndFeel(plaf);
        } catch (Exception e) {
            e.printStackTrace(System.out);
        }
        JFrame f = new JFrame(plaf);
        f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

        f.setSize(500, 100);
        f.setLocationByPlatform(true);
        JFrame.setDefaultLookAndFeelDecorated(true);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        showFrame(UIManager.getSystemLookAndFeelClassName());
        showFrame(UIManager.getCrossPlatformLookAndFeelClassName());
        showFrame("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
    }
}