java树结构stream工具类

菜单实体类

package com.example.demo.entity;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.List;

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
public class Menu {
    
    public Integer id;
    
    public String name;
    
    public Integer parentId;
    
    public List childList;


    public Menu(Integer id, String name, Integer parentId) {
        this.id = id;
        this.name = name;
        this.parentId = parentId;
    }


}

生成树结构工具类

package com.example.demo.util;

import cn.hutool.json.JSONUtil;
import com.example.demo.entity.Menu;

import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;

publ