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BinaryTreeLevelOrderTraversal.java

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import shared.TreeNode;

import java.util.ArrayList;

public class BinaryTreeLevelOrderTraversal {

public ArrayList<ArrayList<Integer>> levelOrder(TreeNode root) {

ArrayList<ArrayList<Integer>> result = new ArrayList<ArrayList<Integer>>();

if (root==null){

return result;

}

ArrayList<TreeNode> current = new ArrayList<TreeNode>();

ArrayList<TreeNode> next = new ArrayList<TreeNode>();

current.add(root);

while(!current.isEmpty()){

ArrayList<Integer> level = new ArrayList<Integer>();

for(int i=0;i<current.size();i++){

level.add(current.get(i).val);

if(current.get(i).left!=null)

next.add(current.get(i).left);

if(current.get(i).right!=null)

next.add(current.get(i).right);

}

result.add(level);

ArrayList<TreeNode> temp = current;

current = new ArrayList<TreeNode>(next);

next = temp;

next.clear();

}

return result;

}

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

}

}