java实现多叉树查找

 package tree;
 
 import java.util.List;
 import java.util.ArrayList;
 import java.io.Serializable;
 
 public class TreeNode implements Serializable {
     private int parentId;
     private int selfId;
     protected String nodeName;
     protected Object obj;
     protected TreeNode parentNode;
     protected List<TreeNode> childList;
 
     public TreeNode() {
         initChildList();
     }
 
     public TreeNode(TreeNode parentNode) {
         this.getParentNode();
         initChildList();
     }
 
     public boolean isLeaf() {
         if (childList == null) {
             return true;
         } else {
             if (childList.isEmpty()) {
                 return true;
             } else {
                 return false;
             }
         }
     }
 
     /* 插入一个child节点到当前节点中 */
     public void addChildNode(TreeNode treeNode) {
         initChildList();
         childList.add(treeNode);
     }
 
     public void initChildList() {
         if (childList == null)
             childList = new ArrayList<TreeNode>();
     }
 
     public boolean isValidTree() {
         return true;
     }
 
     /* 返回当前节点的父辈节点集合 */
     public List<TreeNode> getElders() {
         List<TreeNode> elderList = new ArrayList<TreeNode>();
         TreeNode parentNode = this.getParentNode();
         if (parentNode == null) {
             return elderList;
         } else {
             elderList.add(parentNode);
             elderList.addAll(parentNode.getElders());
             return elderList;
         }
     }
 
     /* 返回当前节点的晚辈集合 */
     public List<TreeNode> getJuniors() {
         List<TreeNode> juniorList = new ArrayList<TreeNode>();
         List<TreeNode> childList = this.getChildList();
         if (childList == null) {
             return juniorList;
         } else {
             int childNumber = childList.size();
             for (int i = 0; i < childNumber; i++) {
                 TreeNode junior = childList.get(i);
                 juniorList.add(junior);
                 juniorList.addAll(junior.getJuniors());
             }
             return juniorList;
         }
     }
 
     /* 返回当前节点的孩子集合 */
     public List<TreeNode> getChildList() {
         return childList;
     }
 
     /* 删除节点和它下面的晚辈 */
     public void deleteNode() {
         TreeNode parentNode = this.getParentNode();
         int id = this.getSelfId();
 
         if (parentNode != null) {
             parentNode.deleteChildNode(id);
         }
     }
 
     /* 删除当前节点的某个子节点 */
     public void deleteChildNode(int childId) {
         List<TreeNode> childList = this.getChildList();
         int childNumber = childList.size();
         for (int i = 0; i < childNumber; i++) {
             TreeNode child = childList.get(i);
             if (child.getSelfId() == childId) {
                 childList.remove(i);
                 return;
             }
         }
     }
 
     /* 动态的插入一个新的节点到当前树中 */
     public boolean insertJuniorNode(TreeNode treeNode) {
         int juniorParentId = treeNode.getParentId();
         if (this.parentId == juniorParentId) {
             addChildNode(treeNode);
             return true;
         } else {
             List<TreeNode> childList = this.getChildList();
             int childNumber = childList.size();
             boolean insertFlag;
 
             for (int i = 0; i < childNumber; i++) {
                 TreeNode childNode = childList.get(i);
                 insertFlag = childNode.insertJuniorNode(treeNode);
                 if (insertFlag == true)
                     return true;
             }
             return false;
         }
     }
 
     /* 找到一颗树中某个节点 */
     public TreeNode findTreeNodeById(int id) {
         if (this.selfId == id)
             return this;
         if (childList.isEmpty() || childList == null) {
             return null;
         } else {
             int childNumber = childList.size();
             for (int i = 0; i < childNumber; i++) {
                 TreeNode child = childList.get(i);
                 TreeNode resultNode = child.findTreeNodeById(id);
                 if (resultNode != null) {
                     return resultNode;
                 }
             }
             return null;
         }
     }
 
     /* 遍历一棵树，层次遍历 */
     public void traverse() {
         if (selfId < 0)
             return;
         print(this.selfId);
         if (childList == null || childList.isEmpty())
             return;
         int childNumber = childList.size();
         for (int i = 0; i < childNumber; i++) {
             TreeNode child = childList.get(i);
             child.traverse();
         }
     }
 
     public void print(String content) {
         System.out.println(content);
     }
 
     public void print(int content) {
         System.out.println(String.valueOf(content));
     }
 
     public void setChildList(List<TreeNode> childList) {
         this.childList = childList;
     }
 
     public int getParentId() {
         return parentId;
     }
 
     public void setParentId(int parentId) {
         this.parentId = parentId;
     }
 
     public int getSelfId() {
         return selfId;
     }
 
     public void setSelfId(int selfId) {
         this.selfId = selfId;
     }
 
     public TreeNode getParentNode() {
         return parentNode;
     }
 
     public void setParentNode(TreeNode parentNode) {
         this.parentNode = parentNode;
     }
 
     public String getNodeName() {
         return nodeName;
     }
 
     public void setNodeName(String nodeName) {
         this.nodeName = nodeName;
     }
 
     public Object getObj() {
         return obj;
     }
 
     public void setObj(Object obj) {
         this.obj = obj;
     }
 }