Java tutorial
import java.awt.Color; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.UIManager; public class UIDefaultsButton { public static void main(String[] args) { UIManager.put("Button.background", Color.BLACK); UIManager.put("Button.foreground", Color.RED); JFrame aWindow = new JFrame("This is a Border Layout"); aWindow.setBounds(30, 30, 300, 300); // Size aWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JButton bn = new JButton("asdf"); aWindow.add(bn); aWindow.setVisible(true); // Display the window } }