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02_Singleton.cs
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155 lines (130 loc) · 3.49 KB
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/*******************************************************************
Copyright(c) 2016, Harry He
All rights reserved.
Distributed under the BSD license.
(See accompanying file LICENSE.txt at
https://github.com/zhedahht/CodingInterviewChinese2/blob/master/LICENSE.txt)
*******************************************************************/
//==================================================================
// 《剑指Offer——名企面试官精讲典型编程题》代码
// 作者：何海涛
//==================================================================
// 面试题2：实现Singleton模式
// 题目：设计一个类，我们只能生成该类的一个实例。
using System;
namespace _02_Singleton
{
public sealed class Singleton1
{
private Singleton1()
{
}
private static Singleton1 instance = null;
public static Singleton1 Instance
{
get
{
if (instance == null)
instance = new Singleton1();
return instance;
}
}
}
public sealed class Singleton2
{
private Singleton2()
{
}
private static readonly object syncObj = new object();
private static Singleton2 instance = null;
public static Singleton2 Instance
{
get
{
lock (syncObj)
{
if (instance == null)
instance = new Singleton2();
}
return instance;
}
}
}
public sealed class Singleton3
{
private Singleton3()
{
}
private static object syncObj = new object();
private static Singleton3 instance = null;
public static Singleton3 Instance
{
get
{
if (instance == null)
{
lock (syncObj)
{
if (instance == null)
instance = new Singleton3();
}
}
return instance;
}
}
}
public sealed class Singleton4
{
private Singleton4()
{
Console.WriteLine("An instance of Singleton4 is created.");
}
public static void Print()
{
Console.WriteLine("Singleton4 Print");
}
private static Singleton4 instance = new Singleton4();
public static Singleton4 Instance
{
get
{
return instance;
}
}
}
public sealed class Singleton5
{
Singleton5()
{
Console.WriteLine("An instance of Singleton5 is created.");
}
public static void Print()
{
Console.WriteLine("Singleton5 Print");
}
public static Singleton5 Instance
{
get
{
return Nested.instance;
}
}
class Nested
{
static Nested()
{
}
internal static readonly Singleton5 instance = new Singleton5();
}
}
class Program
{
static void Main(string[] args)
{
// 也会打印An instance of Singleton4 is created.
Singleton4.Print();
// 不会打印An instance of Singleton5 is created.
Singleton5.Print();
}
}
}