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PrintTreeByLine.java

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/**

* 剑指Offer，把二叉树打印成多行

*/

import java.util.ArrayList;

import java.util.LinkedList;

import java.util.Queue;

public class PrintTreeByLine {

ArrayList<ArrayList<Integer> > Print(TreeNode pRoot) {

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

if (pRoot == null) {

return result;

}

Queue<TreeNode> q = new LinkedList<>();

int current = 1;

int next = 0;

q.offer(pRoot);

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

while ( !q.isEmpty() ) {

TreeNode t = q.poll();

line.add(t.val);

current--;

if (t.left != null) {

q.offer(t.left);

next++;

}

if (t.right != null) {

q.offer(t.right);

next++;

}

if (current == 0) {

result.add(line);

line = new ArrayList<>();

current = next;

next = 0;

}

}

return result;

}

}