import java.awt.*;
 
import javax.swing.*;
public class NuevoJpanel extends JPanel{
private Color color1 = new Color(255,255,255);
 private Color color2 = new Color(0,0,0);
    protected void paintComponent(Graphics g){ 
     Graphics2D g2 = (Graphics2D) g.create(); 
           Rectangle clip = g2.getClipBounds(); 
           float x=getWidth(); 
           float y=getHeight(); 
           g2.setPaint(new GradientPaint(0.0f, 0.0f, color1.darker(),getWidth(),getHeight(), color2.darker()));
           g2.fillRect(clip.x, clip.y, clip.width, clip.height);
  }
 public Color getColor1() {return color1;} 
 public void setColor1(Color color1) {this.color1 =  color1;} 
 public Color getColor2() {return color2;} 
 public void setColor2(Color color2){this.color2 = color2;}
 public static void main(String[] args){
	 JFrame ventana = new JFrame();
	 NuevoJpanel panel = new NuevoJpanel();
	 panel.setVisible(true);
	 ventana.add(panel);
	 ventana.setVisible(true);
 
 }
}