Question

我正在研究Java中MVC模式的基本示例，我不确定如何向模型添加多个视图。这是我目前的代码：

public class Student {
   private String rollNo;
   private String name;

   public String getRollNo() {
      return rollNo;
   }

   public void setRollNo(String rollNo) {
      this.rollNo = rollNo;
   }

   public String getName() {
      return name;
   }

   public void setName(String name) {
      this.name = name;
   }
}

public class StudentView {
   public void printStudentDetails(String studentName, String studentRollNo){
      System.out.println("Student: ");
      System.out.println("Name: " + studentName);
      System.out.println("Roll No: " + studentRollNo);
   }
}

public class StudentController {
   private Student model;
   private StudentView view;

   public StudentController(Student model, StudentView view){
      this.model = model;
      this.view = view;
   }

   public void setStudentName(String name){
      model.setName(name);      
   }

   public String getStudentName(){
      return model.getName();       
   }

   public void setStudentRollNo(String rollNo){
      model.setRollNo(rollNo);      
   }

   public String getStudentRollNo(){
      return model.getRollNo();     
   }

   public void updateView(){                
      view.printStudentDetails(model.getName(), model.getRollNo());
   }    
}

public class MVCPatternDemo {
   public static void main(String[] args) {

      //fetch student record based on his roll no from the database
      Student model  = retriveStudentFromDatabase();

      //Create a view : to write student details on console
      StudentView view = new StudentView();

      StudentController controller = new StudentController(model, view);

      controller.updateView();

      //update model data
      controller.setStudentName("John");

      controller.updateView();
   }

   private static Student retriveStudentFromDatabase(){
      Student student = new Student();
      student.setName("Robert");
      student.setRollNo("10");
      return student;
   }
}

我在控制器中发现的问题是它只接受类类型'StudentView'的视图。我将如何更改此示例，以便将许多不同的类视为视图，例如“SwingView”。

Answer 1

你可以试试这个

public interface Views {
   public void printStudentDetails(String studentName, String      studentRollNo);
}

public class StudentView implements Views
{

    public void printStudentDetails(String studentName, String studentRollNo)
    {
       String display =  "Name: " + studentName + "Roll No: " +    studentRollNo;
       JOptionPane.showMessageDialog(null,display);
    }
}

我想要一些更华丽的东西，你可以让StudentView扩展JPanel和MVCPatternDemo一个JFrame

MVC - 一个在Java中具有多个视图的模型

1 个答案: