递归

java递归

实体类

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Menu {
    private String menu_id;
    private String parent_id;
    private String menu_name;
    private String menu_url;
    private String menu_sort;
    private String product_id;
    private List<Menu> children;
    private String url;
}

树结构递归

private List<Menu> createTree(String pid, List<Menu> menus) {
        List<Menu> treeMenu = new ArrayList<>();
        for (Menu menu : menus) {
                if((pid).equals(menu.getParent_id())){
                    if(("".equals(pid))){
                        menu.setParent_id(null);
                    }
                    menu.setChildren(createTree(menu.getMenu_id(), menus));
                    treeMenu.add(menu);
                }
        }
        return treeMenu;
    }

调用

createTree("", list)