abstract class Data{//Data类：打印数据
    abstract public void Display();
}
class Integer extends Data{//Data的子类
    int value;
    Integer(){
        value=5310;
    }
    public void Display(){//方法重写
        System.out.println(value);
    }
}
class Boolean extends Data{
    boolean value;
    Boolean(){
        value=true;
    }
    public void Display(){
        System.out.println(value);
    }
}
abstract class Factory{
    abstract public Data CreatDataObject();//抽象类：创造指定数据类型,所有数据类型的父类
}
class IntegerFactory extends Factory{//Integer类，Factory子类
    public Data CreatDataObject(){//方法重写
        return new Integer();
    }
}
class BooleanFactory extends Factory{
    public Data CreatDataObject(){
        return new Boolean();
    }
}
class Document{
    Data pd;
    Document(Factory pf){
        pd=pf.CreatDataObject();//使pd是数据类型的上转型对象
    }
    public void displayData(){//调用pd子类，即不同数据类型重写的对象
        pd.Display();
    }
}
public class MyDoc{
    static Document b;
    public static void main(String[] args) {
        b=new Document(new BooleanFactory());
        b.displayData();
    }
}