How to implement a tree data-structure in Java?

Question

Is there any standard Java library class to represent a tree in Java?

Specifically I need to represent the following:

• The sub-tree at any node can have

Answer 1

There are a couple of tree data structures in Java, such as DefaultMutableTreeNode in JDK Swing, Tree in Stanford parser package, and other toy codes. But none of these are sufficient yet small enough for general purpose.

Java-tree project attempts to provide another general-purpose tree data structure in Java. The difference between this and others are

• Totally free. You can use it anywhere (except in your homework :P)
• Small but general enough. I put everything of the data structure in one class file, so it would be easy to copy/paste.
• Not just a toys. I am aware of dozens of Java tree codes that can only handle binary trees or limited operations. This TreeNode is much more than that. It provides different ways of visiting nodes, such as preorder, postorder, breadthfirst, leaves, path to root, etc. Moreover, iterators are provided too for the sufficiency.
• More utils will be added. I am willing to add more operations to make this project comprehensive, especially if you send a request through github.