JProgressBar 看起来不正确

Question

Even using the following code the JProgressBar I'm using to display the progress of a download is far from the Windows 10 native look: in other programs the green part of the progress bar fills the entire height of the progress bar but in Java it doesn't seem to be the case. Also when updated the progress bar feels very chunky compared to other programs.

Here's how it looks normally https://i.imgur.com/xmhWrxf.png

In java https://i.imgur.com/81T0hbF.png

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
JDialog.setDefaultLookAndFeelDecorated(true);
JFrame.setDefaultLookAndFeelDecorated(true);

the main JFrame of my app

    private JButton button = new JButton("Test");

    private JProgressBar progressBar = new JProgressBar();

    private JPanel panel = new JPanel();

    public MainFrame()
    {

        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        progressBar.setMinimum(0);
        progressBar.setMaximum(100);
        progressBar.setValue(60);

        progressBar.setEnabled(true);

        progressBar.setPreferredSize(new Dimension(300, 25));

        this.panel.add(progressBar);
        this.panel.add(button);

        this.setSize(400, 600);
        this.setContentPane(panel);
        this.setVisible(true);
    }

Answer 1

This made my progressbar look much better in my opinion.

public static Font defaultFont = new Font(Font.decode(null).getName(), Font.PLAIN, 12);
progressbar.setBorder(BorderFactory.createLineBorder(Color.LIGHT_GRAY));
        progressbar.setBackground(new Color(230, 230, 230));
        progressbar.setForeground(new Color(120, 230, 90));
        progressbar.setUI(new BasicProgressBarUI() {
            @Override
            protected Color getSelectionBackground() {
                return new Color(50, 50, 50);
            }

            @Override
            protected Color getSelectionForeground() {
                return new Color(50, 50, 50);
            }
        }

Edit: you can optionally use progressbar.setStringPainted(true) to show the percentage

Answer 2

You should post the source code so that we can have a look at it.

My guess is that the size of progress bar needs to be adjusted.

Use the setSize() method to reduce the size of the bar.