写给自己看的小设计6 - 对象设计过程之对象创建

public class ComponentA
{
  // 类的成员直接new出来
 ComponentB m_componentB = new ComponentB();
 
 public ComponentA() { }
 
 public void Action()
 {
  m_componentB.Say();
 }
 
 static void Main(string[] args)
 {
    // 函数的本地变量直接new出来
  ComponentA component = new ComponentA();
  component.Action();
 }
}
 
class ComponentB
{
 public void Say()
 {
  Console.WriteLine("Hello!");
 }
}

public class Program
{
 static void Main(string[] args)
 {
  Component componentA = Component.makeEmptyComponent();
  Component componentB = Component.makeSimpleComponent("Test");
  componentA.Say();
  componentB.Say();
 }
}
 
public class Component
{
 private string m_name;
 private Component (string name, int id, string summary, string description, int priority)
 {
  m_name = name;
 }
 
 public void Say() { Console.WriteLine("Hi, my name is {0}", m_name); }
 
 public static Component makeEmptyComponent() { return new Component("Empty", 0, "", "", 0); }
 public static Component makeSimpleComponent(string name) { return new Component(name, 0, "", "", 0); }
 public static Component makeNormalComponent(string name, int id, string summary) { return new Component(name, id, summary, "", 0); }
}

public class Program
{
 static void Main(string[] args)
 {
  Component componentA = SimpleFactory.makeComponentA();
  Component componentB = SimpleFactory.makeComponentB();
  componentA.M();
  componentB.M();
 }
}
 
public static class SimpleFactory
{
 public static Component makeComponentA() { return new ComponentA(); }
 public static Component makeComponentB() { return new ComponentB(); }
}
 
public class Component
{
 public virtual void M() { }
}
 
public class ComponentA : Component
{
 public override void M() { Console.WriteLine("This is A"); }
}
 
public class ComponentB : Component
{
 public override void M() { Console.WriteLine("This is B"); }
}

public class Program
{
 static void Main(string[] args)
 {
  ComponentAFactory componentAFactory = new ComponentAFactory();
  Component componentA = componentAFactory.makeComponent();
  componentA.M();
 }
}
 
public abstract class Factory
{
 public abstract Component makeComponent();
}
 
public class ComponentAFactory : Factory
{
 public override Component makeComponent() { return new ComponentA(); }
}
public class ComponentBFactory : Factory
{
 public override Component makeComponent() { return new ComponentB(); }
}

public abstract class CarFactory
{
 public abstract Wheel makeWheel();
 public abstract Light makeLight();
}