【Java代码】


class Matrix {  //各种格式的文件最终都被转化为像素矩阵

    //此处代码省略

}

interface ImageImp {

    public void doPaint(Matrix m);  //显示像素矩阵m

}



class WinImp implements ImageImp {

    public void doPaint(Matrix m) {/*调用Windows系统的绘制函数绘制像素矩阵*/}

}



class LinuxImp implements ImageImp {

    public void doPaint(Matrix m) {/*调用Linux系统的绘制函数绘制像素矩阵*/}

}



abstract class Image {

     protected      (1)        imp; 

    public void setImp(ImageImp imp) {

            (2)       = imp; }

    public abstract void parseFile(String fileName);

   

}



class BMP extends Image {

    public void parseFile(String fileName) {

        //此处解析BMP文件并获得一个像素矩阵对象m

                   (3)            ;//显示像素矩阵m

    }

}



class GIF extends Image {

    //此处代码省略

}



class JPEG extends Image {

    //此处代码省略

}



public class Main{

    public static void main(String[] args)

    {

        //在Windows操作系统上查看demo.bmp图像文件

        Image image1 =      (4)      ;

        ImageImp imageImp1 =       (5)       ;

                   (6)            ;

        image1.parseFile("demo.bmp");

    }

}

public class Main {
   public static void main(String[] args) {
       Plane plane = (Plane) XMLUtilPlane.getBean("plane");
       PlaneMaker planeMaker = (PlaneMaker)XMLUtilPlane.getBean("planeMaker");
       planeMaker.setPlane(plane);
       planeMaker.makePlane();
   }
}



import javax.xml.parsers.*;
import org.w3c.dom.*;
import java.io.*;
public class XMLUtilPlane
{
//该方法用于从XML配置文件中提取具体类类名，并返回一个实例对象
  public static Object getBean(String args)
  {
     try
     {
        //创建文档对象
        DocumentBuilderFactory dFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = dFactory.newDocumentBuilder();
        Document doc;                    
        doc = builder.parse(new File("homework-07/BridgeConfigPen.xml"));
        NodeList nl=null;
        Node classNode=null;
        String cName=null;
        nl = doc.getElementsByTagName("className");
       
        if(args.equals("plane"))
        {
           //获取包含类名的文本节点
              classNode=nl.item(0).getFirstChild();
             
        }
        else if(args.equals("planeMaker"))
        {
           //获取包含类名的文本节点
              classNode=nl.item(1).getFirstChild();
        }
       
           cName=classNode.getNodeValue();
           //通过类名生成实例对象并将其返回
           Class c=Class.forName(cName);
         Object obj=c.newInstance();
           return obj;      
          }  
              catch(Exception e)
              {
                 e.printStackTrace();
                 return null;
              }
     }
}

===========================================

public abstract class Plane {
   public abstract void showName(String company,Plane plane);
}

public class CargoPlane extends Plane{
   @Override
   public void showName(String company, Plane plane) {
       System.out.println(company + " make"+ " CargoPlane");
   }
}

public class PassengerPlane extends Plane{
   @Override
   public void showName(String company, Plane plane) {
       System.out.println(company + " make"+ " PassengerPlane");
   }
}

===========================================

public abstract class PlaneMaker {
   public Plane plane;
   public void setPlane(Plane plane) {
       this.plane=plane;
   }
   public abstract void makePlane();
}

public class Airbus extends PlaneMaker{
   @Override
   public void makePlane() {
       String company="Airbus company";
       this.plane.showName(company,this.plane);
   }
}

public class Boeing extends PlaneMaker{
   @Override
   public void makePlane() {
       String company="Boeing company";
       this.plane.showName(company,plane);
   }
}

public class McDonnellDouglas extends PlaneMaker{
   @Override
   public void makePlane() {
       String company="McDonnellDouglas company";
       this.plane.showName(company,plane);
   }
}