谁能帮小弟我把这个程序中的滚动条加进去？

谁能帮我把这个程序中的滚动条加进去？？
[code=Java][/code]
import java.awt.*;
import javax.swing.*;

/**
 *
 * @author Administrator
 */
public class WordAnalsys extends JFrame{
  private JLabel lab1=new JLabel();
  private JButton btnOpen=new JButton("打开");
  private JButton btnSave=new JButton("另存为");
  private JTextArea ja1=new JTextArea(20,40);
  private JTextArea ja2=new JTextArea(20,40);
  private JButton btnClean=new JButton("重置");
  private JButton btnAnalysis=new JButton("重置");

  public WordAnalsys(){
  super("Test");
  Container c=this.getContentPane();
   
  JPanel pan1=new JPanel();//放按钮
  pan1.setLayout(new FlowLayout(FlowLayout.LEFT));
  pan1.add(btnOpen);
  pan1.add(btnSave);
   
  ImageIcon img1= new ImageIcon("java.png");
  lab1.setIcon(img1);
  JPanel pan2=new JPanel();//放标签
  pan2.setLayout(new FlowLayout(FlowLayout.RIGHT));
  pan2.add(lab1);
   
  JPanel pan4=new JPanel();//放面板1和面板2
  pan4.setLayout(new BorderLayout());
  pan4.add(pan1,"West");
  pan4.add(pan2,"East");
  c.add(pan4,"North");

  JPanel pan5=new JPanel();//放置JTextArea
  pan5.setLayout(null);
  ja1.setBounds(8, 16, 402, 276);
  ja2.setBounds(416, 16, 202, 276);
  JScrollPane sp1=new JScrollPane(ja1);
  JScrollPane sp2=new JScrollPane(ja2);

  ja1.setBorder(BorderFactory.createTitledBorder("源代码框"));//createRaisedBevelBorder()); // 凸边框
  pan5.add(sp1);
  ja2.setBorder(BorderFactory.createTitledBorder("分析结果框"));
  pan5.add(sp2);
  c.add(pan5,"Center");
   
  JPanel pan6=new JPanel();
  pan6.setLayout(new FlowLayout());
  pan6.add(btnClean);
  pan6.add(btnAnalysis);
  c.add(pan6,"South");  
   
  }
  public static void main(String[] args) {
  WordAnalsys wa=new WordAnalsys();
  wa.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  wa.setSize(630, 387);
  wa.setVisible(true);
  wa.setLocation(300, 100);
  }

}


本人想这样写，其他的不改，把滚动条加进去就给20分。。。

[解决办法]

Java code

package test;import java.awt.*;import javax.swing.*;/** * * @author Administrator */public class Test extends JFrame{      private JLabel lab1=new JLabel();      private JButton btnOpen=new JButton("打开");      private JButton btnSave=new JButton("另存为");      private JTextArea ja1=new JTextArea(20,40);      private JTextArea ja2=new JTextArea(20,40);      private JButton btnClean=new JButton("重置");      private JButton btnAnalysis=new JButton("重置");      public Test(){          super("Test");          Container c=this.getContentPane();                  JPanel pan1=new JPanel();//放按钮          pan1.setLayout(new FlowLayout(FlowLayout.LEFT));          pan1.add(btnOpen);          pan1.add(btnSave);                  ImageIcon img1= new ImageIcon("java.png");          lab1.setIcon(img1);          JPanel pan2=new JPanel();//放标签          pan2.setLayout(new FlowLayout(FlowLayout.RIGHT));          pan2.add(lab1);                  JPanel pan4=new JPanel();//放面板1和面板2          pan4.setLayout(new BorderLayout());          pan4.add(pan1,"West");          pan4.add(pan2,"East");          c.add(pan4,"North");              JPanel pan5=new JPanel();//放置JTextArea          pan5.setLayout(null);//          ja1.setBounds(8, 16, 402, 276);//          ja2.setBounds(416, 16, 202, 276);                        ja1.setBorder(BorderFactory.createTitledBorder("源代码框"));//createRaisedBevelBorder()); // 凸边框                    ja2.setBorder(BorderFactory.createTitledBorder("分析结果框"));          JScrollPane sp1=new JScrollPane(ja1);          JScrollPane sp2=new JScrollPane(ja2);          sp1.setBounds(8, 16, 402, 276);          sp2.setBounds(416, 16, 202, 276);                    pan5.add(sp1);          pan5.add(sp2);          c.add(pan5,BorderLayout.CENTER);                  JPanel pan6=new JPanel();          pan6.setLayout(new FlowLayout());          pan6.add(btnClean);          pan6.add(btnAnalysis);          c.add(pan6,"South");             }      public static void main(String[] args) {          Test wa=new Test();          wa.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);          wa.setSize(630, 387);          wa.setVisible(true);          wa.setLocation(300, 100);      }}