数据结构-B树实现

发布一个k8s部署视频：https://edu.youkuaiyun.com/course/detail/26967

课程内容：各种k8s部署方式。包括minikube部署，kubeadm部署，kubeasz部署，rancher部署，k3s部署。包括开发测试环境部署k8s，和生产环境部署k8s。

腾讯课堂连接地址https://ke.qq.com/course/478827?taid=4373109931462251&tuin=ba64518

第二个视频发布  https://edu.youkuaiyun.com/course/detail/27109

腾讯课堂连接地址https://ke.qq.com/course/484107?tuin=ba64518

介绍主要的k8s资源的使用配置和命令。包括configmap，pod，service，replicaset，namespace，deployment，daemonset，ingress，pv，pvc，sc，role，rolebinding，clusterrole，clusterrolebinding，secret，serviceaccount，statefulset，job，cronjob，podDisruptionbudget，podSecurityPolicy,networkPolicy,resourceQuota，limitrange，endpoint，event，conponentstatus，node，apiservice，controllerRevision等。

第三个视频发布：https://edu.youkuaiyun.com/course/detail/27574

详细介绍helm命令，学习helm chart语法，编写helm chart。深入分析各项目源码，学习编写helm插件
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B树实现。

 

package com.data.struct;


public class BTree {
	private Node root;
	private int degree;
	
	public BTree(int degree,int [] data){
		this.degree=degree;
		//create();
		for(int i=0;i<data.length;i++){
			insert(data[i]);
		}
	}
	
	private void create(){
		Node node=new Node();
		node.leaf=true;
		root=node;
	}
	
	public void insert(int key){
		if(root==null){
			Node node=new Node();
			node.leaf=true;
			node.key[0]=key;
			node.n=1;
			root=node;
			return;
		}
		Node r=root;
		if(r.n==2*degree-1){
			Node s=new Node();
			root=s;
			s.leaf=false;
			s.n=0;
			s.child[0]=r;
			r.parent=s;
			splitChild(s,0);
			insertNotFull(s,key);
		}else{
			insertNotFull(r,key);
		}
	}
	
	public void printTree(){
		System.out.print("      ");
		for(int i=0;i<root.n;i++){
			System.out.print(root.key[i]);
		}
		innerPreorderWalk(root,1);
		System.out.println();
	}
	
	private void innerPreorderWalk(Node node,int depth){
		if(node!=null){
			for(int i=6-depth*2;i>0;i--){
				System.out.print(" ");
			}
			for(int i=0;i<node.n;i++){
				System.out.print(node.key[i]);
			}
			System.out.print("-");
			if(node!=root){
				for(int i=0;i<node.parent.n;i++){
					System.out.print(node.parent.key[i]);
				}
			}
			System.out.println();
			for(int i=0;i<node.n+1;i++){
				innerPreorderWalk(node.child[i],depth+1);
			}
			
		}
		
	}
	
	private void splitChild(Node node,int i){
		Node z=new Node();
		z.parent=node;
		Node y=node.child[i];
		z.leaf=y.leaf;
		z.n=degree-1;
		for(int j=0;j<degree-1;j++){
			z.key[j]=y.key[j+degree];
		}
		if(!y.leaf){
			for(int j=0;j<degree;j++){
				z.child[j]=y.child[j+degree];
				y.child[j+degree].parent=z;
			}
		}
		y.n=degree-1;
		for(int j=node.n;j>=i+1;j--){
			node.child[j+1]=node.child[j];
		}
		node.child[i+1]=z;
		for(int j=node.n-1;j>=i;j--){
			node.key[j+1]=node.key[j];
		}
		node.key[i]=y.key[degree-1];
		node.n=node.n+1;
	}
	private void insertNotFull(Node node,int key){
		int i=node.n-1;
		if(node.leaf){
			while(i>=0&&key<node.key[i]){
				node.key[i+1]=node.key[i];
				i=i-1;
			}
			node.key[i+1]=key;
			node.n+=1;
		}else{
			while(i>=0&&key<node.key[i]){
				i=i-1;
			}
			i=i+1;
			Node child=node.child[i];
			if(child.n==2*degree-1){
				splitChild(node,i);
				if(key>node.key[i]){
					i=i+1;
				}
			}
			insertNotFull(node.child[i],key);
		}
	}
	
	public SearchResult search(int key){
		return innerSearch(root,key);
	}
	private SearchResult innerSearch(Node node,int key){
		int i=0;
		while(i<degree*2-1 && key>node.key[i]){
			i=i+1;
		}
		if(i<degree*2-1 && key==node.key[i]){
			SearchResult result=new SearchResult();
			result.setIndex(i);
			result.setNode(node);
			return result;
		}else if(node.leaf){
			return null;
		}else{
			return innerSearch(node.child[i],key);
		}
	}
	
	public class SearchResult{
		private Node node;
		private int index;
		public Node getNode() {
			return node;
		}
		public void setNode(Node node) {
			this.node = node;
		}
		public int getIndex() {
			return index;
		}
		public void setIndex(int index) {
			this.index = index;
		}
		
		
	}
	
	public  class Node{
		private Node parent;
		private Node []child=new Node[2*degree];
		private int [] key=new int[2*degree-1];
		private boolean leaf;
		private int n;
		public boolean isLeaf() {
			return leaf;
		}
		public void setLeaf(boolean leaf) {
			this.leaf = leaf;
		}
		
		public void addChild(int index,Node node)throws Exception{
			if(child[index]!=null){
				throw new Exception("child is not null");
			}
			child[index]=node;
			node.parent=this;
			this.leaf=false;
			n=n+1;
			if(n>2*degree-1){
				throw new Exception("n exceeded");
			}
		}
		public void adKey(int index ,int k)throws Exception{
			if(key[index]!=-1){
				throw new Exception("key is not empty");
			}
			key[index]=k;
		}
		
	}

	public static void main(String[] args) {
		int [] data=new int[]{1,2,3,4,5,6,7,8,9};
		BTree btree=new BTree(2,data);
		System.out.println();
		btree.printTree();
		int [] data2=new int[]{9,8,7,6,5,4,3,2,1};
		BTree btree2=new BTree(2,data2);
		System.out.println();
		btree2.printTree();
		int [] data3=new int[]{1,8,3,9,4,6,5,2,7};
		BTree btree3=new BTree(2,data3);
		System.out.println();
		btree3.printTree();
	}

}

删除还没实现待续。