두 갈래 나무를 실현하다

package com.litao;

import java.util.Arrays;

public class Node
{
	private Node right;

	private Node left;

	private int value;

	public Node(int value)
	{
		this.value = value;
	}

	public void add(int value)
	{
		if (value > this.value)
		{
			if (right != null)
			{
				right.add(value);
			} else
			{
				Node node = new Node(value);
				right = node;
			}
		} else
		{
			if (left != null)
			{
				left.add(value);
			} else
			{
				Node node = new Node(value);
				left = node;
			}
		}
	}

	public boolean find(int value)
	{
		if (value == this.value)
		{
			return true;
		} else if (value > this.value)
		{
			if (right == null)
			{
				return false;
			} else
			{
				return right.find(value);
			}
		} else
		{
			if (left == null)
			{
				return false;
			} else
			{
				return left.find(value);
			}
		}
	}

	public static boolean contains(int[] arr, int value)
	{
		for (int i = 0; i < arr.length; i++)
		{
			if (arr[i] == value)
			{
				return true;
			}
		}
		return false;
	}

	public void diaplay()
	{
		System.out.println(value);
		if (right != null)
		{
			right.diaplay();
		}
		if (left != null)
		{
			left.diaplay();
		}
	}

	public static void main(String[] args)
	{
		int[] values = new int[8];

		for (int i = 0; i < values.length; i++)
		{
			int num = (int) (Math.random() * 15);
			if(!contains(values, num))
			{
				values[i] = num;
			}else
			{
				i--;
			}
		}
		System.out.println(Arrays.toString(values));
		
		Node node = new Node(values[0]);
		
		for(int i = 1; i < values.length;i++)
		{
			node.add(values[i]);
		}
		
		System.out.println(node.find(11));
		
		node.diaplay();
		
		
	}
}