决策树java简单代码运行

以下是一个简单的决策树 Java 代码示例：

import java.util.Scanner;

public class DecisionTree {
    
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        
        // 创建决策树
        TreeNode decisionTree = createDecisionTree();
        
        // 开始询问用户
        while (true) {
            TreeNode current = decisionTree;
            while (current.children != null) {
                System.out.println(current.question);
                String answer = input.nextLine();
                current = current.children.get(answer);
            }
            
            // 打印最终答案
            System.out.println(current.answer);
            
            // 询问用户是否继续
            System.out.println("是否继续？(y/n)");
            String response = input.nextLine();
            if (!response.equalsIgnoreCase("y")) {
                break;
            }
        }
        
        input.close();
    }
    
    // 创建决策树
    private static TreeNode createDecisionTree() {
        TreeNode root = new TreeNode("动物是哺乳动物吗？");
        TreeNode node1 = new TreeNode("是");
        TreeNode node2 = new TreeNode("有羽毛吗？");
        TreeNode node3 = new TreeNode("是");
        TreeNode node4 = new TreeNode("是鸟类");
        TreeNode node5 = new TreeNode("不是鸟类");
        
        root.children.put("是", node1);
        root.children.put("否", node2);
        node2.children.put("是", node3);
        node2.children.put("否", node5);
        node3.children.put("是", node4);
        
        node1.answer = "是哺乳动物";
        node4.answer = "是有羽毛的鸟类";
        node5.answer = "不是鸟类";
        
        return root;
    }
}

class TreeNode {
    String question; // 问题
    String answer; // 答案
    Map<String, TreeNode> children; // 子节点
    
    public TreeNode(String question) {
        this.question = question;
        this.children = new HashMap<>();
    }
}

这个示例创建了一个简单的决策树，用于确定一个动物是否是哺乳动物或鸟类。在程序运行时，它会逐步询问用户一系列问题，直到最终确定动物的分类。