在unity3d中：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public abstract class MonoSingleton<T> : MonoBehaviour
    where T : MonoBehaviour
{
    private static T m_instance;

    public static T Instance
    {
        get
        {
            return m_instance;
        }
    }

    protected virtual void Awake()
    {
        m_instance = this as T;
    }

}
 

在普通類中：

1. class Singleton<T> where T: class,new()  
2. {  
3.     privatestatic T _instance;  
4.     privatestaticreadonlyobject syslock=newobject();  
5.     publicstatic T getInstance()   
6.     {  
7.         if (_instance == null)  
8.         {  
9.             lock (syslock) {  
10.                 if (_instance == null)  
11.                 {  
12.                     _instance = new T();  
13.                 }  
14.             }  
15.         }  
16.        return _instance;  
17.     }  
18. }