jframe color

1getContentPane().setBackground(Color.YELLOW);  //Whatever color

1package Exaple;
2
3import java.awt.Color;
4
5import javax.swing.JFrame;
6
7public class Window {
8
9	public static void main(String[] args) {
10		
11		JFrame frame = new JFrame(); 
12		frame.setExtendedState(JFrame.MAXIMIZED_BOTH); 
13		frame.setVisible(true);
14		frame.setTitle("Expaple");
15		frame.setBackground(Color.BLUE);
16	}
17
18}

1private JFrame frame;
2frame.getContentPane().setBackground(Color.BLACK);

1import java.awt.Color;
2import java.awt.Dimension;
3import javax.swing.JFrame;
4public class SwingDemo {
5   public static void main(String[] args) {
6      JFrame frame = new JFrame();
7      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
8      frame.setPreferredSize(new Dimension(550, 300));
9      frame.getContentPane().setBackground(Color.BLUE);
10      frame.pack();
11      frame.setVisible(true);
12   }
13}