0
我正在使用.NET
框架练习编程,我非常困惑于Singleton pattern
和State pattern
。我尝试过使用单例模式,现在我怎样才能将状态模式实现到同一个类。我的代码是BankAccount
已autoimplemented财产即AccountStateID
我该如何解决一个类中的单态模式状态模式
public class BronzeState : AccountStates
{
//static member
private static BronzeState bronzeState;
//constructor
private BronzeState()
{
this.LowerLimit = 0;
this.UpperLimit = 5000;
this.Rate = 0.01/100;
}
public static BronzeState GetInstance()
{
if (bronzeState != null)
return bronzeState;
else
{
bronzeState = new BronzeState();
return bronzeState;
}
}
public void StateChangeCheck(BankAccount bankAccount)
{
if (bankAccount.Balance > UpperLimit)
{
bankAccount.AccountState = new SilverState();
}
}
}
//same goes with GoldSte , SilverState, PlatinumState.
我唯一的问题是我如何使用状态模式来改变状态,如果余额为更多的上限。