关于Swing组件的问题 请大家帮忙解决 ！

代码如下：
 private void jbInit() throws Exception 
  {
    this.getContentPane().setLayout(borderLayout1);
    this.setTitle("电脑管理系统");
    this.getContentPane().add(jSplitPane1,java.awt.BorderLayout.CENTER);
    //JTree1的模型
    DefaultMutableTreeNode root1 = new DefaultMutableTreeNode("设备管理");//定义JTree1根节点
    DefaultMutableTreeNode leafnode1 = new DefaultMutableTreeNode("新增设备登记");
    root1.add(leafnode1);//根节点下添加叶节点
    leafnode1 = new DefaultMutableTreeNode("设备报废登记");
    root1.add(leafnode1);
    leafnode1 = new DefaultMutableTreeNode("设备维修登记");
    root1.add(leafnode1);
    jTree1 = new JTree(root1);
    //JTree2的模型
    DefaultMutableTreeNode root2 = new DefaultMutableTreeNode("房卡管理");//定义JTree2的根节点
    DefaultMutableTreeNode leafnode2 = new DefaultMutableTreeNode("房卡制作登记");
    root2.add(leafnode2);
    leafnode2 = new DefaultMutableTreeNode("房卡制作查询");
    root2.add(leafnode2);
    jTree2 = new JTree(root2);
    //JTree3的模型
     DefaultMutableTreeNode root3 = new DefaultMutableTreeNode("考勤管理");
     DefaultMutableTreeNode  leafnode3 = new DefaultMutableTreeNode("电脑房工作日志");
     root3.add(leafnode3);
     leafnode3 = new DefaultMutableTreeNode("电脑房值班表");
     root3.add(leafnode3);
     jTree3 = new JTree(root3);
    //JTree4的模型
     DefaultMutableTreeNode root4 = new DefaultMutableTreeNode("系统设置");
     DefaultMutableTreeNode  leafnode4 = new DefaultMutableTreeNode("系统用户");
     root4.add(leafnode4);
     leafnode4 = new DefaultMutableTreeNode("用户口令修改");
     root4.add(leafnode4);
     leafnode4 = new DefaultMutableTreeNode("系统设置");
     root4.add(leafnode4);
     leafnode4 = new DefaultMutableTreeNode("数据备份");
     root4.add(leafnode4);
     leafnode4 = new DefaultMutableTreeNode("操作日志");
     root4.add(leafnode4);
     jTree4 = new JTree(root4);
     
  }
}我建立了4棵Tree 下面请问 如何把这4棵树放到一个容器里面 让他们按顺序展现出来 ？还有 请问用什么swing 的容器 （如果方便的话 请添上适当的源码 送高分） 谢谢