求高手解决关于将Jpanel放到JScrollPanel滑块不出现，下面是我的代码
import java.awt.*;import javax.swing.*;/** * * @author Administrator */public class PrintTest extends JFrame{ JMenu menu=new JMenu("打印"); JMenuBar bar=new JMenuBar(); JMenuItem Print=new JMenuItem("打印表"); JButton btnPrint=new JButton("打印"); JLabel labname=new JLabel("姓名:"); JLabel labname1=new JLabel("朱宏堂"); JLabel labsex=new JLabel("性别:"); JLabel labsex1=new JLabel("男"); JLabel labdept=new JLabel("部门:"); JLabel labdept1=new JLabel("09计算机"); JLabel labNum=new JLabel("学号:"); JLabel labNum1=new JLabel("0982038:"); JLabel labData=new JLabel("发证日期:"); JLabel labData1=new JLabel("2007年12月"); Container c=new Container(); JPanel pan0=new JPanel(); JPanel pan1=new JPanel(); JPanel pan2=new JPanel(); JPanel pan3=new JPanel(); JPanel pan4=new JPanel(); JPanel pan5=new JPanel(); JPanel pan6=new JPanel(); JPanel pan7=new JPanel(); JPanel pan8=new JPanel(); JPanel pan9=new JPanel(); JPanel pan10=new JPanel(); JPanel pan11=new JPanel(); // JPanel pan5=new JPanel(); public PrintTest(){ menu.add(Print); JScrollPane JSpan=new JScrollPane(pan0); bar.add(menu); setJMenuBar(bar); c=this.getContentPane(); c.setLayout(new BorderLayout()); c.add(JSpan);//网格 pan0.setLayout(new GridLayout(5,2,5,5)); pan1.setLayout(null); pan0.setBackground(Color.GRAY); pan0.add(pan1); pan0.add(pan2); pan0.add(pan3); pan0.add(pan4); pan0.add(pan5); pan0.add(pan6); pan0.add(pan7); pan0.add(pan8); pan0.add(pan9); pan0.add(pan10); labname.setBounds(new Rectangle(250,100,100,40)); labname1.setBounds(new Rectangle(350,100,150,40)); labsex.setBounds(new Rectangle(250,120,150,40)); labsex1.setBounds(new Rectangle(350,120,150,40)); labdept.setBounds(new Rectangle(250,140,150,40)); labdept1.setBounds(new Rectangle(350,140,150,40)); labNum.setBounds(new Rectangle(250,160,150,40)); labNum1.setBounds(new Rectangle(350,160,150,40)); labData.setBounds(new Rectangle(250,180,150,40)); labData1.setBounds(new Rectangle(350,180,150,40)); pan1.add(labname); pan1.add(labname1); pan1.add(labsex); pan1.add(labsex1); pan1.add(labdept); pan1.add(labdept1); pan1.add(labNum); pan1.add(labNum1); pan1.add(labData); pan1.add(labData1); } public static void main(String[] args) { PrintTest pt=new PrintTest(); pt.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); pt.setVisible(true); pt.setSize(500,400); pt.setLocation(300,100); }}