Unity object pool implementation

using System.Collections;using System.Collections.Generic;using UnityEngine;/*** Object pool*/public class ObjectPool{//Singleton modeprivate static ObjectPool instance = null;private ObjectPool() { }public static ObjectPool Instance{get{if (instance == null){instance = new ObjectPool();}return instance;}}//data partDictionary> pool = new Dictionary>();//API part/// 
/// Put a game object into the object pool/// 
/// The object to be placed in the object poolpublic void Put(GameObject obj){// not the first caseif (pool.ContainsKey(obj.name)){pool[obj.name].Add(obj);}else{// The first time to store this type of game object//declare a new list containing this class of game objectsList list = new List();/ / Create the corresponding relationship between the key name and the key valuepool.Add(obj.name, list);// put the game object in the listlist.Add(obj);}//Hide the object put into the object poolobj.SetActive(false);}/// 
/// Get a game object with a name from the object pool/// 
/// Game object name to get/// public GameObject Get(string key){//Check if there is an object with that nameif (pool.ContainsKey(key)){// Are there any remaining elements in the listif (pool[key].Count <= 0){return null;}else {//Get the specific game object and returnGameObject obj = pool[key][0];// remove the game object from the object poolpool[key].Remove(obj);obj.SetActive(true);return obj;}}else{return null;}}/// 
/// Clear the object pool, called when jumping the scene/// 
public void Clear(){//The statically modified object will not be released when jumping the scene in Unitypool.Clear();}}