Java设计模式--工厂模式

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本文详细介绍了三种工厂模式：简单工厂模式、工厂方法模式和抽象工厂模式，并通过实例代码展示了每种模式的特点及应用场景。

工厂模式种类：

一、简单工厂模式：不利于生成系列产品；

二、工厂方法模式：又称为多形性工厂；

三、抽象工厂模式：称为工具箱，产生产品族，但不利于产生新的产品；

简单工厂的类图：

①汽车接口：

public class Audi implements Car{
	private String name="Audi" ;
	@Override
	public String toString() {
		
		return "name == "+name;
	}
	@Override
	public Car get() {
		return new Audi();
	}
}

public class Benz implements Car{
	private String name="Benz" ;
	@Override
	public String toString() {
		
		return "name == "+name;
	}
	@Override
	public Car get() {
		return new Benz();
	}
}

public class Bmw implements Car{
	private String name="Bmw" ;
	@Override
	public String toString() {
		
		return "name == "+name;
	}
	@Override
	public Car get() {
		return new Bmw();
	}
}

public interface Car {
	public Car get();
}

public class CarFactory {
    public static Car make(Car car){
        return car.get();
    }
}

public class ForS {
	  public static Car take(String name){
	        if("Bmw".equals(name)){
	            return CarFactory.make(new Bmw());
	        }else if("Benz".equals(name)){
	            return CarFactory.make(new Benz());
	        }else if("Audi".equals(name)){
	            return CarFactory.make(new Audi());
	        }else{
	            System.out.println("暂时没Car");
	            return null;
	        }
	  }
	  
		public static void main(String[] args) {
		     System.out.println("进入汽车店:");
		       System.out.println(take("Bmw"));
		       System.out.println(take("Benz"));
		       System.out.println(take("Audi"));
		}
}

B 工厂方法模式：解决简单工厂模式中的麻烦的逻辑判断，反射配合xml也可决绝这样的问题，此时学习工厂方法模式的优点。

public class Audi implements Car{
	private String name="Audi" ;
	@Override
	public String toString() {
		
		return "name == "+name;
	}
	@Override
	public Car get() {
		return new Audi();
	}
}

public class AudiFactory implements CarFactory{

	@Override
	public Car make() {
		return new Bmw();
	}


}

public class Benz implements Car{
	private String name="Benz" ;
	@Override
	public String toString() {
		
		return "name == "+name;
	}
	@Override
	public Car get() {
		return new Benz();
	}
}

public class BenzFactory implements CarFactory{

	@Override
	public Car make() {
		return new Benz();
	}


}

public class Bmw implements Car{
	private String name="Bmw" ;
	@Override
	public String toString() {
		
		return "name == "+name;
	}
	@Override
	public Car get() {
		return new Bmw();
	}
}

public class BmwFactory implements CarFactory{

	@Override
	public Car make() {
		return new Audi();
	}
}

public interface Car {
	public Car get();
}

public interface CarFactory {
    public Car make();
}


public class ForS {
	  public static Car take(CarFactory factory){
		  return factory.make();
	  }
	  
		public static void main(String[] args) {
		     System.out.println("进入汽车店:");
		       System.out.println(take(new BmwFactory()));
		       System.out.println(take(new BenzFactory()));
		       System.out.println(take(new AudiFactory()));
		}
}