急死人的问题哦！GG们帮我想想办法呀~~~~~

Question

试试：
加一个：JPanel panel1 = new JPanel();
       contentPane.add(panel1,null);
       panel1.add(contentPane,null);

Answer 1

import java.util.*;import java.awt.image.*;
import java.awt.geom.*;
import java.awt.GradientPaint.*;
import java.awt.Color.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.plaf.basic.BasicTextUI;public class bgtest extends JApplet{    JPaintPanel paintpanel;
    public void init()
    {
Container contentPane=this.getContentPane();
paintpanel=new JPaintPanel();
contentPane.setLayout(new BorderLayout());
contentPane.add(paintpanel,BorderLayout.CENTER);
paintpanel.validate();
paintpanel.repaint();
     }
}//end class bgtest
  class JPaintPanel extends JPanel{
        final  static Color purple=new Color(153,153,204);
        final  static Color yellow=new Color(237,243,190);
        JButton button;
        JTabbedPane TabbedPane;
        JPanel pan1,pan2;        JPaintPanel(){
          init();
        }        public void init(){            button=new JButton("here");
            TabbedPane=new JTabbedPane();
            pan1=new JPanel();
            pan2=new JPanel();
            TabbedPane.addTab("Page1",pan1);
            TabbedPane.addTab("Page2",pan2);
            //TabbedPane.addTab("Page3",new JLabel("a label in page 3"));
            //TabbedPane.addTab("Page4",new JLabel("a label in page 4"));
            setLayout(new BorderLayout());
            add(button,BorderLayout.NORTH);
            add(TabbedPane,BorderLayout.CENTER);
             this.paintAll(TabbedPane.getGraphics());
           this.validate();
            TabbedPane.revalidate();
      }
        public void paintComponent(Graphics g){ super.paintComponent(g);
             Graphics2D g2=(Graphics2D) g;
               g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            GradientPaint purpletoyellow = new GradientPaint(0,0,purple,getWidth(),0,yellow);
             g2.setPaint(purpletoyellow);
            g2.fill(new Rectangle2D.Double(0,0,getWidth(),getHeight()));
        }  }//end class JPaintPanel