求大神看一个JTable和JTree结合的问题。。。。

我不清楚怎么实现点一班出现一班同学的数据点二班出现二班的，我觉得应该是在易做图里实现但是我不会求大神在我的代码里帮我指导下

import java.io.IOException;
import javax.swing.*;
import javax.swing.tree.*;
class frame {
JFrame frame=new JFrame();

  JTree t;




  public void init() throws IOException{
  String data[][]={{"zhang","20","boy"},{"li","19","girl"}};
  String data1[][]={{"wang","21","boy"}};

  String name[]={"姓名","年龄","性别"};

  JTable zc=new JTable(data,name);
  JScrollPane tabscr=new JScrollPane(zc);
  //JTable zc1=new JTable(data1,name);
  //JScrollPane tabscr1=new JScrollPane(zc);



  DefaultMutableTreeNode first=new DefaultMutableTreeNode("班级结点");
  DefaultMutableTreeNode second1=new DefaultMutableTreeNode("1班");
  DefaultMutableTreeNode second2=new DefaultMutableTreeNode("2班");

  DefaultTreeModel dm=new DefaultTreeModel(first);
  dm.insertNodeInto(second1, first, first.getChildCount());
  dm.insertNodeInto(second2, first, first.getChildCount());
  t=new JTree(dm);
  JScrollPane scrollPane2=new JScrollPane(t);
  scrollPane2.setAutoscrolls(true);
  JSplitPane sp=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,scrollPane2,tabscr);
  sp.setDividerLocation(100);
  frame.add(sp);
  frame.setSize(400,300);
  frame.setVisible(true);
  }
}
  public class TestTree{
  public static void main(String args[]) throws IOException{
  new frame().init();
  }
} --------------------编程问答--------------------

import java.io.IOException;

import javax.swing.*;

import javax.swing.tree.*;

 class frame {

 JFrame frame=new JFrame();



  JTree t;



  

   

  

  public void init() throws IOException{

	  String data[][]={{"zhang","20","boy"},{"li","19","girl"}};

	  String data1[][]={{"wang","21","boy"}};

	  

	  String name[]={"姓名","年龄","性别"};

	  

	  JTable zc=new JTable(data,name);

	  JScrollPane tabscr=new JScrollPane(zc);

	  //JTable zc1=new JTable(data1,name);

	  //JScrollPane tabscr1=new JScrollPane(zc);

	  





	  

	  DefaultMutableTreeNode first=new DefaultMutableTreeNode("班级结点");

	  DefaultMutableTreeNode second1=new DefaultMutableTreeNode("1班");

	  DefaultMutableTreeNode second2=new DefaultMutableTreeNode("2班");

      

	  DefaultTreeModel dm=new DefaultTreeModel(first);

	  dm.insertNodeInto(second1, first, first.getChildCount());

	  dm.insertNodeInto(second2, first, first.getChildCount());

	  t=new JTree(dm);

	  JScrollPane scrollPane2=new JScrollPane(t);

	  scrollPane2.setAutoscrolls(true);

	  JSplitPane sp=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,scrollPane2,tabscr);

	  sp.setDividerLocation(100);

	  frame.add(sp);

	  frame.setSize(400,300);

	  frame.setVisible(true);  

  }

}

  public class TestTree{

  public static void main(String args[]) throws IOException{

	  new frame().init();

  }

}

--------------------编程问答-------------------- 有大神帮我一下吗？？？？？？？？？？？？ --------------------编程问答--------------------

补充：Java ,  Java SE