Source Code : Expanding or Collapsing All Nodes in a JTree Component

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Expanding or Collapsing All Nodes in a JTree Component

    


import java.util.Enumeration;

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

public class Main {
  public void expandAll(JTree tree) {
    TreeNode root = (TreeNode) tree.getModel().getRoot();
    expandAll(tree, new TreePath(root));
  }

  private void expandAll(JTree tree, TreePath parent) {
    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);
      }
    }
    tree.expandPath(parent);
    // tree.collapsePath(parent);
  }
}

   
    
    
    
  

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