How can I set a JLabel's background and border the same as a table header?

Question

I want to recreate a table header looks using JLabel. The look and feel of the JLabel needs to be exactly like the JTableHeader would

Answer 1

You need to set a look and feel for the application before trying:

header.setBackground(UIManager.getColor(new JTableHeader().getBackground()));
header.setBorder(UIManager.getBorder(new JTableHeader().getBorder()));

you should set a look and feel first like so:

  try {
    for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
        if ("Nimbus".equals(info.getName())) {
            UIManager.setLookAndFeel(info.getClassName());
            break;
        }
    }
} catch (Exception e) {
    // If Nimbus is not available, you can set the GUI to another look and feel.
}

Here is an example:

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.JTableHeader;

public class Test {

    public Test() {
        initComponents();
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    //set nimbus look and feel
                    for (UIManager.LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
                        if ("Nimbus".equals(info.getName())) {
                            UIManager.setLookAndFeel(info.getClassName());
                            break;
                        }
                    }
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException e) {
                    e.printStackTrace();
                }

                new Test();
            }
        });
    }

    private void initComponents() {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JLabel header = new JLabel("Title");
        header.setBackground(UIManager.getColor(new JTableHeader().getBackground()));
        header.setBorder(UIManager.getBorder(new JTableHeader().getBorder()));

        frame.add(header);

        frame.pack();
        frame.setVisible(true);
    }
}