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  1. import java.util.Random;
  2.  
  3. class BinTree {
  4.  
  5.   class Indirect {
  6.     Integer data;
  7.     Indirect() { data = null; }
  8.   }
  9.  
  10.   static class Node {
  11.     private Integer data;
  12.     private Node left;
  13.     private Node right;
  14.     private Node(Integer data) {
  15.       this.data = data;
  16.       this.left = this.right = null;
  17.     }
  18.     public static Node pushNode(Node root, Integer data) {
  19.       if (root == null) {
  20.         return new Node(data);
  21.       } else if (data.intValue() < root.data.intValue()) {
  22.         root.left = pushNode(root.left, data);
  23.         return root;
  24.       } else {
  25.         root.right = pushNode(root.right, data);
  26.         return root;
  27.       }
  28.     }
  29.     public static Node popNode(Node root, Indirect idata) {
  30.       if (root == null) {
  31.         idata = null;
  32.         return null;
  33.       }
  34.       if (root.left != null) {
  35.         root.left = popNode(root.left, idata);
  36.         return root;
  37.       }
  38.       idata.data = root.data;
  39.       return root.right;
  40.     }
  41.   }
  42.  
  43.   private Node root;
  44.   BinTree() { root = null; }
  45.   void pushNode(Integer data) { root = Node.pushNode(root, data); }
  46.   Integer popNode() {
  47.     Indirect idata;
  48.     root = Node.popNode(root, idata = new Indirect());
  49.     if (root == null && idata == null)
  50.       return null;
  51.     return idata.data;
  52.   }
  53. }
  54.  
  55. class Main {
  56.   final static int N = 10;
  57.   final static int MAX = 10000;
  58.   public static void main(String[] args) {
  59.     Random random = new Random();
  60.     BinTree root = new BinTree();
  61.     Integer data;
  62.     for (int i = 0; i < N; i++) {
  63.       data = new Integer(random.nextInt(MAX));
  64.       root.pushNode(data);
  65.       System.out.println(data);
  66.     }
  67.     System.out.println();
  68.  
  69.     while ((data = root.popNode()) != null) {
  70.       System.out.println(data);
  71.     }
  72.   }
  73. }
  74. /* end */
  75.  
Success #stdin #stdout 0.03s 245632KB
comments (?)
stdin 
Standard input is empty
stdout 
5702
7288
5623
5327
1643
1389
7144
297
5961
2254

297
1389
1643
2254
5327
5623
5702
5961
7144
7288
https://ideone.com/4NjfE
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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