手写一个二叉树【java】

Dear 丶 2022-05-26 03:24 181阅读 0赞

package com.model;
    
    import java.util.ArrayList;
    import java.util.List;
    
    public class Tree {
    
     public Node getRoot() {
      return root;
     }
    
     public void setRoot(Node root) {
      this.root = root;
     }
    
     public List<Node> getResult() {
      return result;
     }
    
     public void setResult(List<Node> result) {
      this.result = result;
     }
    
     public Tree() {
      init();
     }
    
     private void init() {
      Node x = new Node("X", null, null);
      Node y = new Node("Y", null, null);
      Node d = new Node("D", x, y);
      Node b = new Node("B", d, null);
      Node e = new Node("E", null, null);
      Node f = new Node("F", null, null);
      Node c = new Node("C", e, f);
      Node a = new Node("A", b, c);
      root = a;
     }
    
     // 根节点
     private Node root;
     private List<Node> result = new ArrayList<Node>();
    
     // 前序遍历方法 【根左右】
     public void preOrder(Node node) {
    
      result.add(node);
    
      if (node.getlChild() != null) {
    
       preOrder(node.getlChild());
    
      }
    
      if (node.getrChild() != null) {
    
       preOrder(node.getrChild());
    
      }
    
     }
    
     // 中序遍历法【左根右】
     public void inOrder(Node node) {
    
      if (node.getlChild() != null) {
    
       inOrder(node.getlChild());
    
      }
    
      result.add(node);
    
      if (node.getrChild() != null) {
    
       inOrder(node.getrChild());
    
      }
    
     }
    
     // 后序遍历法【左右根】
     public void postOrder(Node node) {
    
      if (node.getlChild() != null) {
    
       postOrder(node.getlChild());
    
      }
    
      if (node.getrChild() != null) {
    
       postOrder(node.getrChild());
    
      }
    
      result.add(node);
    
     }
    
     // 计算深度
     public int caclDepth(Node node) {
    
      if (node.getlChild() == null && node.getrChild() == null) {
    
       return 1;
    
      }
    
      int leftDepth = 0;
      int rightDepth = 0;
      if (node.getlChild() != null) {
    
       leftDepth = caclDepth(node.getlChild());
    
      }
      if (node.getrChild() != null) {
    
       rightDepth = caclDepth(node.getrChild());
    
      }
    
      return leftDepth > rightDepth ? leftDepth + 1 : rightDepth + 1;
    
     }
    
     public static void main(String[] args) {
    
      Tree tree = new Tree();
      System.out.println("根节点：" + tree.getRoot().getDate());
      // 先序排列
      tree.preOrder(tree.getRoot());
      System.out.println("树的深度是：" + tree.caclDepth(tree.getRoot()));
      System.out.println("先序排列后结果：");
      for (Node node : tree.getResult()) {
    
       System.out.print(node.getDate() + "-->");
    
      }
      // 中序排列
      System.out.println();
      Tree tree2 = new Tree();
      tree2.inOrder(tree2.getRoot());
      System.out.println("中序排列后结果：");
      for (Node node : tree2.getResult()) {
    
       System.out.print(node.getDate() + "-->");
    
      }
      // 后序排列
      System.out.println();
      Tree tree3 = new Tree();
      tree3.postOrder(tree3.getRoot());
      System.out.println("后序排列后结果：");
      for (Node node : tree3.getResult()) {
    
       System.out.print(node.getDate() + "-->");
    
      }
    
     }
    
    }

node.java

package com.model;
    
    public class Node {
    
     @Override
     public String toString() {
      return "Node [date=" + date + ", lChild=" + lChild + ", rChild=" + rChild + "]";
     }
     public String getDate() {
      return date;
     }
     public void setDate(String date) {
      this.date = date;
     }
     public Node getlChild() {
      return lChild;
     }
     public void setlChild(Node lChild) {
      this.lChild = lChild;
     }
     public Node getrChild() {
      return rChild;
     }
     public void setrChild(Node rChild) {
      this.rChild = rChild;
     }
     public Node(String date, Node lChild, Node rChild) {
      super();
      this.date = date;
      this.lChild = lChild;
      this.rChild = rChild;
     }
     private String date;
     private Node lChild;
     private Node rChild;
     
     
    }