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Commonly used programming tasks in java

There is a newer version: 1.15

package com.venky.tree;

import java.util.ArrayList;
import java.util.List;

public class Node {
	
	public Node(M data){
		this.data = data;
		this.parent = null;
	}
	private M data;
	private Node parent; 
	
	private List> children = new ArrayList>();
	public List> getChildren(){
		return children;
	}
	
	public Node find(M data){
		if (data.equals(data)){
			return this;
		}
		for (Node child:getChildren()){
			Node found = child.find(data);
			if (found != null){
				return found;
			}
		}
		return null;
	}
	
	
	public Node add(M childChildData){
		Node child = new Node(childChildData);
		return add(child);
		
	}
	
	public Node add(Node child){
		child.parent = this;
		children.add(child);
		return child;
	}
	
	public Node getParent(){
		return parent;
	}
	
	public boolean isRoot(){
		return parent == null;
	}
	
	public boolean isLeaf(){
		return children.isEmpty();
	}
	
	public M data(){
		return this.data;
	}
	
	public List getLeaves(){
		List leaves = new ArrayList();
		loadLeaves(leaves);
		return leaves;
	}
	
	private void loadLeaves(List leafData){
		if (isLeaf()){
			leafData.add(data());
		}
		for (Node child:getChildren()){
			child.loadLeaves(leafData);
		}
		return ;
	}
	
}