java - 如何在jtree中显示数据

Question

我正在尝试从数据库中获取数据并在 jtree 中显示。我遇到问题 ResultSet 在我的代码下面显示最后一个值数据

rs1=DB.Select("SELECT AcCode from tblCoa order by AcCode");

while(rs1.next()){
    DefaultMutableTreeNode Catagory=new DefaultMutableTreeNode(rs1.getString("AcCode"));
    DefaultMutableTreeNode Catagories=new DefaultMutableTreeNode(rs1.getString("AcCode"));
    DefaultMutableTreeNode Catagories2=new DefaultMutableTreeNode(rs1.getString("AcCode"));
    DefaultMutableTreeNode Catagories3=new DefaultMutableTreeNode(rs1.getString("AcCode"));
    DefaultMutableTreeNode Catagories4=new DefaultMutableTreeNode(rs1.getString("AcCode"));
    Catagory.add(Catagories);
    Catagories.add(Catagories2);
    Catagories.add(Catagories3);
    Catagories.add(Catagories4);
    DefaultTreeModel dtm=new DefaultTreeModel(Catagory);
    this.jTree1.setModel( dtm);
}

Answer 1

  DefaultMutableTreeNode Catagory = new DefaultMutableTreeNode();


  while(rs1.next()){
       Catagory.add(rs1.getString("AcCode")); 
  }
            DefaultTreeModel dtm=new DefaultTreeModel(Catagory);
            this.jTree1.setModel( dtm);

您在 while 循环内初始化变量。这将在每个循环中重置以前的数据。并且您有多个 DefaultMutableTreeNode 变量，它们将存储相同的 rs1.getString("AcCode") 。我不明白为什么。对代码做了一些更改，现在尝试一下。