Change the color of a jProgressBar

These properties must be set before creating JProgressBar . For example:

UIManager.put("ProgressBar.background", Color.orange);
UIManager.put("ProgressBar.foreground", Color.blue);
UIManager.put("ProgressBar.selectionBackground", Color.red);
UIManager.put("ProgressBar.selectionForeground", Color.green);

JProgressBar progress = new JProgressBar();
getContentPane().add(progress);

If you need to change the color after the component has been created or make this color change based on the percentage of progress, the solutions # can solve this problem.

Here's an example, using the properties you posted along with the question. Here's the result:

Iputinathreadjusttoshowthepercentageofthebarincreasing.

importjava.awt.*;importjavax.swing.*;publicclassWindowextendsJFrameimplementsRunnable{privatefinalJProgressBarprogress;publicWindow(Stringtitle)throwsHeadlessException{super(title);setSize(300,80);setDefaultCloseOperation(EXIT_ON_CLOSE);setLocationRelativeTo(null);UIManager.put("ProgressBar.background", Color.orange);
        UIManager.put("ProgressBar.foreground", Color.blue);
        UIManager.put("ProgressBar.selectionBackground", Color.red);
        UIManager.put("ProgressBar.selectionForeground", Color.green);

        progress = new JProgressBar();
        progress.setStringPainted(true); // para mostrar a porcentagem como texto na barra
        getContentPane().add(progress);
        new Thread(this).start();
    }

    @Override
    public void run() {
        for(int i = 0; i < 100; i++){
            progress.setValue(i); 
            try {
                Thread.sleep(1000);
            } catch (InterruptedException ex) {}
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            new Window("stackoverflow pt").setVisible(true);
        });
    }
}