無差別に技術をついばむ鳥

public abstract class Animal
{
    private string m_Name;

    public string Name {
        get { return m_Name; }
    }
    private int m_Age;

    public int Age {
        get { return m_Age; }
        set {
            if ( value > 0 ) m_Age = value;
        }
    }

    private string m_password;

    //これが書き込み専用プロパティ
    public string Password {
        set { m_password = value; }
    }

    public Animal( string name, int age ) {
        this.m_Name = name;
        this.Age = age;
    }

    public virtual void Talk( ) {
        Console.WriteLine( "私は{0}。年は{1}だよ。",
            this.m_Name, this.m_Age );
    }

    public abstract void Move( );
}