src/share/classes/javax/swing/tree/DefaultMutableTreeNode.java

*** 1306,1316 ****
          if(tValues.length > 0 && tValues[0].equals("userObject"))
              userObject = tValues[1];
      }
  
      private final class PreorderEnumeration implements Enumeration<TreeNode> {
!         private final Stack<Enumeration<TreeNode>> stack = new Stack<>();
  
          public PreorderEnumeration(TreeNode rootNode) {
              super();
              Vector<TreeNode> v = new Vector<TreeNode>(1);
              v.addElement(rootNode);     // PENDING: don't really need a vector
--- 1306,1316 ----
          if(tValues.length > 0 && tValues[0].equals("userObject"))
              userObject = tValues[1];
      }
  
      private final class PreorderEnumeration implements Enumeration<TreeNode> {
!         private final Stack<Enumeration<? extends TreeNode>> stack = new Stack<>();
  
          public PreorderEnumeration(TreeNode rootNode) {
              super();
              Vector<TreeNode> v = new Vector<TreeNode>(1);
              v.addElement(rootNode);     // PENDING: don't really need a vector
*** 1320,1333 ****
          public boolean hasMoreElements() {
              return (!stack.empty() && stack.peek().hasMoreElements());
          }
  
          public TreeNode nextElement() {
!             Enumeration<TreeNode> enumer = stack.peek();
              TreeNode    node = enumer.nextElement();
!             @SuppressWarnings("unchecked")
!             Enumeration<TreeNode> children = node.children();
  
              if (!enumer.hasMoreElements()) {
                  stack.pop();
              }
              if (children.hasMoreElements()) {
--- 1320,1332 ----
          public boolean hasMoreElements() {
              return (!stack.empty() && stack.peek().hasMoreElements());
          }
  
          public TreeNode nextElement() {
!             Enumeration<? extends TreeNode> enumer = stack.peek();
              TreeNode    node = enumer.nextElement();
!             Enumeration<? extends TreeNode> children = node.children();
  
              if (!enumer.hasMoreElements()) {
                  stack.pop();
              }
              if (children.hasMoreElements()) {
*** 1340,1350 ****
  
  
  
      final class PostorderEnumeration implements Enumeration<TreeNode> {
          protected TreeNode root;
!         protected Enumeration<TreeNode> children;
          protected Enumeration<TreeNode> subtree;
  
          public PostorderEnumeration(TreeNode rootNode) {
              super();
              root = rootNode;
--- 1339,1349 ----
  
  
  
      final class PostorderEnumeration implements Enumeration<TreeNode> {
          protected TreeNode root;
!         protected Enumeration<? extends TreeNode> children;
          protected Enumeration<TreeNode> subtree;
  
          public PostorderEnumeration(TreeNode rootNode) {
              super();
              root = rootNode;