Java樹形菜單的創立

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功效：完成創立一個樹形菜單
解釋：創立樹形菜單構造與創立菜單欄相似，是按條理與模子創立的。
經由過程DefaultMutableTreeNode類創立根節點、子節點和孫節點對象，再經由過程DefaultTreeModel
類應用根節點創立樹范型對象，然後經由過程treeModel.insertNodeInto辦法將節點對象拔出樹范型中。

後果圖：

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("樹形菜單"); setSize(400,400); 
  Container container = getContentPane(); 
 
  //創立根節點和子節點 
  DefaultMutableTreeNode root = new DefaultMutableTreeNode("文本編纂器"); 
  DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("文件"); 
  DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("編纂"); 
  //應用根節點創立TreeModel 
  DefaultTreeModel treeModel = new DefaultTreeModel(root); 
  //拔出子節點node1,node2 
  treeModel.insertNodeInto(node1,root,root.getChildCount()); 
  treeModel.insertNodeInto(node2,root,root.getChildCount()); 
 
  //創立節點node1的子節點並拔出 
  DefaultMutableTreeNode leafnode = new DefaultMutableTreeNode("翻開"); 
  treeModel.insertNodeInto(leafnode,node1,node1.getChildCount()); 
  leafnode = new DefaultMutableTreeNode("保留"); 
  treeModel.insertNodeInto(leafnode,node1,node1.getChildCount()); 
  leafnode = new DefaultMutableTreeNode("另存為"); 
  treeModel.insertNodeInto(leafnode,node1,node1.getChildCount()); 
  leafnode = new DefaultMutableTreeNode("封閉"); 
  treeModel.insertNodeInto(leafnode,node1,node1.getChildCount()); 
 
  //創立節點node2的子節點並拔出 
  leafnode = new DefaultMutableTreeNode("剪切"); 
  treeModel.insertNodeInto(leafnode,node2,node2.getChildCount()); 
  leafnode = new DefaultMutableTreeNode("復制"); 
  treeModel.insertNodeInto(leafnode,node2,node2.getChildCount()); 
  leafnode = new DefaultMutableTreeNode("粘貼"); 
  treeModel.insertNodeInto(leafnode,node2,node2.getChildCount()); 
 
  //創立樹對象 
  JTree tree = new JTree(treeModel); 
  //設置Tree的選擇為一次只能選擇一個節點 
  tree.getSelectionModel().setSelectionMode( 
       TreeSelectionModel.SINGLE_TREE_SELECTION); 
  //注冊監聽器 
  tree.addTreeSelectionListener(this); 
 
  tree.setRowHeight(20); 
 
  //創立節點繪制對象 
  DefaultTreeCellRenderer cellRenderer = 
       (DefaultTreeCellRenderer)tree.getCellRenderer(); 
 
  //設置字體 
  cellRenderer.setFont(new Font("Serif",Font.PLAIN,14)); 
  cellRenderer.setBackgroundNonSelectionColor(Color.white); 
  cellRenderer.setBackgroundSelectionColor(Color.yellow); 
  cellRenderer.setBorderSelectionColor(Color.red); 
 
  //設置選或不選時，文字的變更色彩 
  cellRenderer.setTextNonSelectionColor(Color.black); 
  cellRenderer.setTextSelectionColor(Color.blue); 
   
  //把樹對象添加到內容面板 
  container.add(new JScrollPane(tree)); 
 
  //創立標簽 
  label = new JLabel("你以後選擇的節點為：",JLabel.CENTER); 
  label.setFont(new Font("Serif",Font.PLAIN,14)); 
  container.add(label,BorderLayout.SOUTH); 
 
  setVisible(true); //設置可見 
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //設置窗口封閉舉措 
 } 
 
 //處置TreeSelectionEvent事宜 
 public void valueChanged(TreeSelectionEvent event) 
 { 
  JTree tree = (JTree)event.getSource(); 
  //獲得今朝拔取的節點 
  DefaultMutableTreeNode selectionNode = 
   (DefaultMutableTreeNode)tree.getLastSelectedPathComponent(); 
  String nodeName = selectionNode.toString(); 
  label.setText("你以後拔取的節點為： "+nodeName); 
 } 
 
 public static void main(String args[]) 
 { 
  Tree d = new Tree(); 
 } 
 
} 

本文按條理與模子創立的樹形菜單，與創立菜單欄相似，不曉得小同伴們有無控制吶？