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
}
}