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Java樹形菜單的創(chuàng)建

更新時間：2021年05月19日 11:55:52 作者：IT_xiao小巫

這篇文章主要為大家詳細(xì)介紹了Java圖形用戶界面中樹形菜單的創(chuàng)建樹形菜單的創(chuàng)建，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價值，感興趣的小伙伴們可以參考一下

本文實例為大家分享了Java樹形菜單的創(chuàng)建代碼，供大家參考，具體內(nèi)容如下

功能：實現(xiàn)創(chuàng)建一個樹形菜單
說明：創(chuàng)建樹形菜單結(jié)構(gòu)與創(chuàng)建菜單欄類似，是按層次與模型創(chuàng)建的。
通過DefaultMutableTreeNode類創(chuàng)建根節(jié)點、子節(jié)點和孫節(jié)點對象，再通過DefaultTreeModel
類利用根節(jié)點創(chuàng)建樹模型對象，然后通過treeModel.insertNodeInto方法將節(jié)點對象插入樹模型中。

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("樹形菜單"); setSize(400,400); 
  Container container = getContentPane(); 
 
  //創(chuàng)建根節(jié)點和子節(jié)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(jié)點創(chuàng)建TreeModel 
  DefaultTreeModel treeModel = new DefaultTreeModel(root); 
  //插入子節(jié)點node1,node2 
  treeModel.insertNodeInto(node1,root,root.getChildCount()); 
  treeModel.insertNodeInto(node2,root,root.getChildCount()); 
 
  //創(chuàng)建節(jié)點node1的子節(jié)點并插入 
  DefaultMutableTreeNode leafnode = new DefaultMutableTreeNode("打開"); 
  treeModel.insertNodeInto(leafnode,node1,node1.getChildCount()); 
  leafnode = new DefaultMutableTreeNode("保存"); 
  treeModel.insertNodeInto(leafnode,node1,node1.getChildCount()); 
  leafnode = new DefaultMutableTreeNode("另存為"); 
  treeModel.insertNodeInto(leafnode,node1,node1.getChildCount()); 
  leafnode = new DefaultMutableTreeNode("關(guān)閉"); 
  treeModel.insertNodeInto(leafnode,node1,node1.getChildCount()); 
 
  //創(chuàng)建節(jié)點node2的子節(jié)點并插入 
  leafnode = new DefaultMutableTreeNode("剪切"); 
  treeModel.insertNodeInto(leafnode,node2,node2.getChildCount()); 
  leafnode = new DefaultMutableTreeNode("復(fù)制"); 
  treeModel.insertNodeInto(leafnode,node2,node2.getChildCount()); 
  leafnode = new DefaultMutableTreeNode("粘貼"); 
  treeModel.insertNodeInto(leafnode,node2,node2.getChildCount()); 
 
  //創(chuàng)建樹對象 
  JTree tree = new JTree(treeModel); 
  //設(shè)置Tree的選擇為一次只能選擇一個節(jié)點 
  tree.getSelectionModel().setSelectionMode( 
       TreeSelectionModel.SINGLE_TREE_SELECTION); 
  //注冊監(jiān)聽器 
  tree.addTreeSelectionListener(this); 
 
  tree.setRowHeight(20); 
 
  //創(chuàng)建節(jié)點繪制對象 
  DefaultTreeCellRenderer cellRenderer = 
       (DefaultTreeCellRenderer)tree.getCellRenderer(); 
 
  //設(shè)置字體 
  cellRenderer.setFont(new Font("Serif",Font.PLAIN,14)); 
  cellRenderer.setBackgroundNonSelectionColor(Color.white); 
  cellRenderer.setBackgroundSelectionColor(Color.yellow); 
  cellRenderer.setBorderSelectionColor(Color.red); 
 
  //設(shè)置選或不選時，文字的變化顏色 
  cellRenderer.setTextNonSelectionColor(Color.black); 
  cellRenderer.setTextSelectionColor(Color.blue); 
   
  //把樹對象添加到內(nèi)容面板 
  container.add(new JScrollPane(tree)); 
 
  //創(chuàng)建標(biāo)簽 
  label = new JLabel("你當(dāng)前選擇的節(jié)點為：",JLabel.CENTER); 
  label.setFont(new Font("Serif",Font.PLAIN,14)); 
  container.add(label,BorderLayout.SOUTH); 
 
  setVisible(true); //設(shè)置可見 
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //設(shè)置窗口關(guān)閉動作 
 } 
 
 //處理TreeSelectionEvent事件 
 public void valueChanged(TreeSelectionEvent event) 
 { 
  JTree tree = (JTree)event.getSource(); 
  //獲取目前選取的節(jié)點 
  DefaultMutableTreeNode selectionNode = 
   (DefaultMutableTreeNode)tree.getLastSelectedPathComponent(); 
  String nodeName = selectionNode.toString(); 
  label.setText("你當(dāng)前選取的節(jié)點為： "+nodeName); 
 } 
 
 public static void main(String args[]) 
 { 
  Tree d = new Tree(); 
 } 
 
}

本文按層次與模型創(chuàng)建的樹形菜單，與創(chuàng)建菜單欄類似，不知道小伙伴們有沒有掌握吶？

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