让JTree所有节点展开和关闭的类 - 我爱看火影的日志 - 网易博客

package com.gc.util;

import java.util.Enumeration;

import javax.swing.JTree;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;

public class OpenTree {

//外部调用此方法，如果bo为true展开所有节点，为false关闭所有节点。

 public static void expandTree(JTree tree,boolean bo) {
  TreeNode root = (TreeNode) tree.getModel().getRoot();
  expandAll(tree, new TreePath(root), bo);   
 }

 

 private static void expandAll(JTree tree, TreePath parent, boolean expand) {
  TreeNode node = (TreeNode) parent.getLastPathComponent();
  if (node.getChildCount() >= 0) {           
   for (Enumeration e = node.children(); e.hasMoreElements(); ) {
    TreeNode n = (TreeNode) e.nextElement();
    TreePath path = parent.pathByAddingChild(n);
    expandAll(tree, path, expand);
   }      
  }       
  if (expand) { 
   tree.expandPath(parent);       
   } else {
    tree.collapsePath(parent);      
   } 
 }
}