我正在尝试理解 JXTreeTable ，因为我参考了一个站点来进行简单的 JXTreeTable 实现：下面是修改后的代码（我从一个站点中选择的）
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import javax.swing.*;
import org.jdesktop.swingx.JXTreeTable;
import org.jdesktop.swingx.treetable.AbstractTreeTableModel;
class MyTreeTableModel extends AbstractTreeTableModel {
private MyTreeNode myroot;
public MyTreeTableModel() {
myroot = new MyTreeNode("root", "Root of the tree", "zcxz");
ims.CPool.configureConnPool();
Connection con = CPool.getConnection();
try {
Statement st = con.createStatement();
ResultSet rs = st.executeQuery("select distinct category from inventory");
Statement s2 = con.createStatement();
ResultSet r2 = s2.executeQuery(" select category,name,supplier from inventory");
while (rs.next()) {
MyTreeNode cat = new MyTreeNode(rs.getString(1), " ", " ");
myroot.getChildren().add(cat);
}
while(r2.next())
{
System.out.println(r2.getString(1)+"bnnbnb");
if(this.getValueAt( r2.getObject(1),0).equals(r2.getObject(1))==true)
{ System.out.println("zxccx");
}
}
} catch (Exception x) {
System.out.println(x.getMessage());
x.printStackTrace();
}
}
@Override
public int getColumnCount() {
return 3;
}
@Override
public String getColumnName(int column) {
switch (column) {
case 0:
return "Name";
case 1:
return "Supplier";
case 2:
return "Category";
case 3:
return "Size";
default:
return "Unknown";
}
}
@Override
public Object getValueAt(Object node, int column) {
System.out.println("getValueAt: " + node + ", " + column);
MyTreeNode treenode = (MyTreeNode) node;
switch (column) {
case 0:
return treenode.getName();
case 1:
return treenode.getDescription();
case 2:
return treenode.getCategory();
case 3:
return treenode.getChildren().size();
default:
return "Unknown";
}
}
@Override
public Object getChild(Object node, int index) {
MyTreeNode treenode = (MyTreeNode) node;
return treenode.getChildren().get(index);
}
@Override
public int getChildCount(Object parent) {
MyTreeNode treenode = (MyTreeNode) parent;
return treenode.getChildren().size();
}
@Override
public int getIndexOfChild(Object parent, Object child) {
MyTreeNode treenode = (MyTreeNode) parent;
for (int i = 0; i > treenode.getChildren().size(); i++) {
if (treenode.getChildren().get(i) == child) {
return i;
}
}
// TODO Auto-generated method stub
return 0;
}
public boolean isLeaf(Object node) {
MyTreeNode treenode = (MyTreeNode) node;
if (treenode.getChildren().size() > 0) {
return false;
}
return true;
}
@Override
public Object getRoot() {
return myroot;
}
}
class MyTreeNode {
private String name;
private String description;
private String category;
private List<MyTreeNode> children = new ArrayList<MyTreeNode>();
public MyTreeNode() {
}
public MyTreeNode(String name, String description, String categ) {
this.name = name;
this.category = categ;
this.description = description;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getCategory() {
return category;
}
public void setCategory(String name) {
this.category = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public List<MyTreeNode> getChildren() {
return children;
}
public String toString() {
return "MyTreeNode: " + name + ", " + description + " ," + category;
}
}
public class TT extends JFrame {
private JTabbedPane tabs = new JTabbedPane();
private MyTreeTableModel treeTableModel = new MyTreeTableModel();
private JXTreeTable treeTable = new JXTreeTable(treeTableModel);
public TT() {
super("SwingX Examples");
// Build the tree table panel
JPanel treeTablePanel = new JPanel(new BorderLayout());
treeTablePanel.add(new JScrollPane(treeTable));
tabs.addTab("JXTreeTable", treeTablePanel);
// Add the tabs to the JFrame
add(tabs);
setSize(1024, 768);
Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
setLocation(d.width / 2 - 512, d.height / 2 - 384);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
AppStarter starter = new AppStarter(args);
SwingUtilities.invokeLater(starter);
}
}
class AppStarter extends Thread {
private String[] args;
public AppStarter(String[] args) {
this.args = args;
}
public void run() {
TT example = new TT();
}
}
在运行代码时，我得到以下异常：
at ims.MyTreeTableModel.getValueAt(TT.java:85)
at ims.MyTreeTableModel.<init>(TT.java:41)
at ims.TT.<init>(TT.java:206)
at ims.AppStarter.run(TT.java:247)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:701)
at java.awt.EventQueue.access$000(EventQueue.java:102)
at java.awt.EventQueue$3.run(EventQueue.java:662)
at java.awt.EventQueue$3.run(EventQueue.java:660)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
, Inevtory Items 有子类别，如查询中所示（我想生成一个 JXTreeTable，类别为 parentNodes，属于类别的 Inventory 项目为子元素）。请帮助，因为我是 JXTreeTables 的新手。