classTreeNode{intid;Stringname;List<TreeNode>children;publicTreeNode(intid,Stringname){this.id=id;this.name=name;this.children=newArrayList<>();}}publicTreeNodebuildTree(List<TreeNode>nodeList){Map<Integer,Tree
三、list转树形方法 代码语言:javascript 代码运行次数:0 运行 AI代码解释 publicstaticList<NodeVO>streamToTree(List<NodeVO>treeList,Integer parentId){returntreeList.stream()// 过滤父节点.filter(parent->Objects.equals(parent.getPid(),parentId))// 把父节点children递归赋值成为子节点.peek(child->child...
public static List<Zone> buildTree3(List<Zone> zoneList) { Map<String, List<Zone>> zoneByParentIdMap = new HashMap<>(); zoneList.forEach(zone -> { List<Zone> children = zoneByParentIdMap.getOrDefault(zone.getParentId(), new ArrayList<>()); children.add(zone); zoneByParentIdMap....
publicclassTreeNode{intval; TreeNode left; TreeNode right; TreeNode(intx) { val = x; } } 算法实现类 publicclassSolution{publicTreeNodesortedListToBST(ListNode head){// 假设链表为空就直接返回nullif(head ==null) {returnnull; }// 链表仅仅有一个结点if(head.next ==null) {returnnewTreeNode...
@Data public class MenuNode { private Integer id; private String name; private String menuCode; private String parentCode; private String path; private Integer sort; private List<MenuNode> children; } Controller @RequestMapping("/trees") public List<MenuNode> trees() { // return service.trees...
toMap(DateSourceType::getId, v -> v, (a, b) -> a)); return getDepartmentChildVO2(list, map); } private static List<DateSourceType> getDepartmentChildVO2(List<DateSourceType> list, Map<String, DateSourceType> map) { List<DateSourceType> res = new ArrayList<>(); for (DateSourceType ...
Tree算法工具类 importlombok.experimental.UtilityClass;importjava.util.ArrayList;importjava.util.List;/** *@authorcnxjk *@createTreeUtil date 2021/11/14 9:09 上午 **/@UtilityClasspublicclassTreeUtil{/** * 两层循环实现建树 * *@paramtreeNodes 传入的树节点列表 ...
Collection是所有单列集合的父接口,因此在 Collection 中定义了单列集合(List和Set)通用的一些方法,这些方法可用于操作所有的单列集合。方法如下: 1、添加元素 (1)add(E obj):添加元素对象到当前集合中。 (2)addAll(Collection<? extends E> other):添加other集合中的所有元素对象到当前集合中,即this = this...
import java.util.ArrayList; import java.util.List; import java.util.Stack; class TreeNode { int val; TreeNode left; TreeNode right; public TreeNode(int val) { this.val = val; } } public class Main { public static void main(String[] args) { // 创建一个二叉树 TreeNode root = new...