【设计模式-抽象工厂】

抽象工厂模式可以向客户端提供一个接口，使客户端在不必指定产品的具体的情况下，创建多个产品族中的产品对象。

在农场系统的实现

//两种抽象产品：水果、蔬菜

public interface Fruit

{

}

public interface Veggie

{

}

//四种具体产品：北方水果，热带水果，北方蔬菜，热带蔬菜

//Northern Fruit

public class NorthernFruit implements Fruit

{

private String name;

public NorthernFruit(String name)

{

}

public String getName()

{

return name;

}

public void setName(String name)

{

this. name = name;

}

}

//TropicalFruit

public class TropicalFruit implements Fruit

{

private String name;

public TropicalFruit(String name)

{

}

public String getName()

{

return name;

}

public void setName(String name)

{

this. name = name;

}

}

//NorthernVeggie

public class NorthernVeggie implements Veggie

{

private String name;

public NorthernVeggie(String name)

{

}

public String getName()

{

return name;

}

public void setName(String name)

{

this. name = name;

}

}

//TropicalVeggie

public class TropicalVeggie implements Veggie

{

private String name;

public TropicalVeggie(String name)

{

}

public String getName()

{

return name;

}

public void setName(String name)

{

this. name = name;

}

}

//抽象工厂角色

public interface Gardener

{

public Fruit createFruit(String name);

public Veggie createVeggie(String name);

}

//具体工厂角色：北方工厂，热带角色

public class NorthernGardener implements Gardener

{

public Fruit createFruit(String name)

{

return new NorthernFruit(name);

}

public Veggie createVeggie(String name)

{

return new NorthernVeggie(name);

}

}

public class TropicalGardener implements Gardener

{

public Fruit createFruit(String name)

{

return new TropicalFruit(name);

}

public Veggie createVeggie(String name)

{

return new TropicalVeggie(name);

}

}

这样客户端只需要创建具体工厂的实例，然后调用工厂对象的工厂方法就可以得到所需要的产品对象。