Cor de Fundo de Janelas

import javax.swing.*;
import java.awt.*;

public class CorDeFundo extends JFrame {
public CorDeFundo() {
 super("Definindo a cor de fundo para a janela");
 Container tela = getContentPane();
 tela.setBackground(new Color(255, 128, 128));
 setSize(500, 300);
 setVisible(true);
}

public static void main(String args[]) {
 CorDeFundo app = new CorDeFundo();
 app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}