C 單例模式

using system;

namespace singleton
}public class singleton1
//私有建構函式，阻止從外部構造
private static singleton1 _obj = new singleton1();//靜態內部變數，載入時初始化
public static singleton1 getinstance() //總是返回同乙個例項
public void sayhi() ", this); }
}public class singleton2
//私有建構函式，阻止從外部構造
private volatile static singleton2 _obj;//多執行緒訪問時無鎖情況下要用volatile
private static readonly object locker = new object();
public static singleton2 getinstance()}}
return _obj;//總是返回同乙個例項
}public void sayhi() ", this); }
}}

C 單例模式

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