JAvaツリーの作成

配列に配置されている場合、ツリーを作成し、格納構造がツリーチェーンテーブルであるデータのセットを指定します.

class TreeNode
{
	 int data;
	 TreeNode lchild ;
	 TreeNode rchild ;
	public int getData()
	{
		return data;
	}
	public TreeNode getLchild()
	{
		return lchild;
	}
	public TreeNode getRchild()
	{
		return rchild;
	}

	public void setNode(int data,TreeNode lc,TreeNode rc){
		this.data = data;
		lchild = lc;
		rchild = rc;
	}
	
	public TreeNode(){
		
	}
}

class Counter{
	public static int count=0;
}

public class TreeTest
{
	public static TreeNode createTree(TreeNode root, int[]a, int i)
	{
		if(i < a.length)
		{
			if(a[i] == 0)
			{
				root = null;
				
			}
			else
			{
				
				TreeNode tl = new TreeNode();
				TreeNode tr = new TreeNode();
				root.setNode(a[i],createTree(tl,a,++(Counter.count)),createTree(tr,a,++(Counter.count)));
				
			}
			
		}
		return root;
	}
	public static void traverse(TreeNode root)
	{
		if(root != null)
		{
			System.out.println(root.getData());
			traverse(root.getLchild());
			traverse(root.getRchild());
		}else{
			System.out.println(0);
		}
	}
	public static void main(String[] args)
	{
		int[] a = {1,2,3,0,0,4,0,0,5,0,0};
		TreeNode root = new TreeNode();
		
		root = createTree(root,a,Counter.count);
		if(root == null)
		{
			System.out.println(" ×");
		}
		
		
		traverse(root);
	}
}