功能：實作建立一個樹狀選單說明：建立樹狀選單結構與建立功能表列類似，是按層次與模型建立的。
透過DefaultMutableTreeNode類別建立根節點、子節點和孫節點對象，再透過DefaultTreeModel
類別利用根節點建立樹模型對象，然後透過treeModel.insertNodeInto方法將節點物件插入樹模型中。
效果圖：
代碼：
import java.awt.*; import javax.swing.*; import javax.swing.tree.*; import javax.swing.event.*; public class Tree extends JFrame implements TreeSelectionListener { private JLabel label; public Tree() { super ("樹形選單"); setSize(400,400); Container container = getContentPane(); //創建根節點和子節點DefaultMutableTreeNode root = new DefaultMutableTreeNode("文本編輯器"); DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("文件"); DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("編輯"); //利用根節點創建TreeModel DefaultTreeModel treeModel = new DefaultTreeModel(root); //插入子節點node1,node2 treeModel.insertNodeInto(node1,root,root.getChildCount()); treeModel.insertNodeInto(node2,root,root.getChildCount()); //建立節點node1的節點子節點並插入DefaultMutableTreeNode leafnode = new DefaultMutableTreeNode("打開"); treeModel.insertNodeInto(leafnode,node1,node1.getChildCount()); leafnode = new DefaultMutableTreeNode("儲存"); treeModel.insertNodeInto(leafnode,node1,node1.getChildCount()); lealeaMuodetablee Default(Warault" ; treeModel.insertNodeInto(leafnode,node1,node1.getChildCount()); leafnode = new DefaultMutableTreeNode("關閉"); treeModel.insertNodeInto(leafnode,node1,node1.getChildCount()); //建立節點節點並插入node2的子節點並插入leafnode = new DefaultMutableTreeNode("剪下"); treeModel.insertNodeInto(leafnode,node2,node2.getChildCount()); leafnode = new DefaultMutableTreeNode("複製"); treeModel.insertNodeInto(leafnode,node2,node2.getChildCount()); treeModel.insertNodeInto(leafnode,node2,node2.getChildCount()); //建立樹物件JTree tree = new JTree(treeModel); //設定Tree的選擇為一次只能選擇一個節點tree.getSelectionModel().setSelectionMode( TreeSelectionModel.SINGLE_TREE_SELECTION); //註冊監聽喇叭tree.addTreeSelectionListener(this); tree.setRowHeight(20); //建立節點繪製物件DefaultTreeCellRenderer cellRenderer = (DefaultTreeCellRenderer)tree.getCellRenderer(); //設定字體cellRenderer.setFont(new Font("Serif",Font.PLAIN,14)); cellRenderer. setBackgroundNonSelectionColor(Color.white); cellRenderer.setBackgroundSelectionColor(Color.yellow); cellRenderer.setBorderSelectionColor(Color.red); //設定選或不選時，文字的變化顏色cellRenderer.setTextNonSelectionColor(Color.black); cellRenderer.setSelection)(Color. /把樹物件加入到內容面板container.add(new JScrollPane(tree)); //建立標籤label = new JLabel("你目前選擇的節點為：",JLabel.CENTER); label.setFont(new Font("Serif",Font.PLAIN,14)); container .add(label,BorderLayout.SOUTH); setVisible(true); //設定可見setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //設定視窗關閉動作} //處理TreeSelectionEvent事件public void valueChanged(TreeSelectionEvent event) { JTree tree = (JTree)event.getSource(); //取得目前選取的節點DefaultMutableTreeNode selectionNode = (DefaultMutableTreeNode)tree.getLastSelectedPathComponent(); String nodeName = selectionNode.toString(); label.setText("你目前選取的節點為： "+nodeName); } public static void main(String args[]) { Tree d = new Tree(); } }本文依層次與模型創建的樹狀選單，與建立選單列類似，不知道小夥伴們有沒有掌握吶？