GoF - Simple Factory

• GoF (2)
• Creational Patterns 
• UML
• 
• Code
• 實作 Adventurer

/// 

/// 一般類別: Adventurer (Product)
/// 
public class Adventurer
{
    // virtual： 虛擬方法
    public virtual string getType()
    {

    }
}

• 實作 Archer

/// 

/// Archer 繼承 Adventurer (ConcreteProduct)
/// 
public class Archer : Adventurer
{
    // override: 覆寫 getType 方法
    public override string getType()
    {
        string message = "I am a Archer";
        System.Console.WriteLine(message);
        return message;
    }
}

• 實作 Warrior

/// 

/// Warrior 繼承 Adventurer (ConcreteProduct)
/// 
public class Warrior : Adventurer
{
    // override: 覆寫 getType 方法
    public override string getType()
    {
        string message = "I am a Warrior";
        System.Console.WriteLine(message);
        return message;
    }
}

• 實作 TrainingCamp

/// 

/// TrainingCamp (SimpleFactory)
/// 
public class TrainingCamp 
{
    public Adventurer trainAdventurer(string type)
    {
        switch (tpye)
        {
            case "archer":
                System.Console.WriteLine("Training a Archer");
                return new Archer();
                break;
            case "warrior":
                System.Console.WriteLine("Training a Warrior");
                return new Warrior();
                break;
            default:
        }
    } 
}

• Sample Code

public class SampleCode 
{
    public void Demo()
    {
        // 創建 TrainingCamp
        TrainingCamp trainingCmap = new TrainingCamp();
        // 帶入不同的參數 archer / warrior
        Adventurer memberA = trainingCmap.trainAdventurer("archer");
        Adventurer memberB = trainingCmap.trainAdventurer("warrior");
        
        System.Console.WriteLine(memberA.getType());
        System.Console.WriteLine(memberB.getType());
    }
}

Ref

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