使用递归方法展平嵌套的Java对象为字符串数组

import lombok.Data;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

@Data
class CategoryTreeDto {
    private String name;
    private List<CategoryTreeDto> childrenItems;
}

public class Test {

  public static void main(String[] args) throws IOException {
    // 模拟数据，实际应用中从数据源获取
    List<CategoryTreeDto> list = new ArrayList<>();

    CategoryTreeDto pantry = new CategoryTreeDto();
    pantry.setName("Pantry");

    CategoryTreeDto butter = new CategoryTreeDto();
    butter.setName("Butter");

    CategoryTreeDto cream = new CategoryTreeDto();
    cream.setName("Cream");
    butter.setChildrenItems(List.of(cream));

    CategoryTreeDto snack = new CategoryTreeDto();
    snack.setName("Snack");

    pantry.setChildrenItems(List.of(butter, snack));

    CategoryTreeDto medicine = new CategoryTreeDto();
    medicine.setName("Medicine");

    list.add(pantry);
    list.add(medicine);

    List<String> result = new ArrayList<>();
    for (CategoryTreeDto dto : list) {
      traverse(dto, dto.getName(), result);
    }
    System.out.println(result);
  }

  private static void traverse(CategoryTreeDto dto, String current, List<String> result) {
    List<CategoryTreeDto> children = dto.getChildrenItems();
    if (children == null || children.isEmpty()) {
      result.add(current);
      return;
    }
    for (CategoryTreeDto childDto : dto.getChildrenItems()) {
      String next = current + "->" + childDto.getName();
      traverse(childDto, next, result);
    }
  }
}