步骤 3

创建控制器。

StudentController.java

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());

   }    

}

步骤 4

使用 StudentController 方法来演示 MVC 设计模式的用法。

MVCPatternDemo.java

public class MVCPatternDemo {

   public static void main(String[] args) {

      //从数据可获取学生记录

      Student model  = retriveStudentFromDatabase();

      //创建一个视图：把学生详细信息输出到控制台

      StudentView view = new StudentView();

      StudentController controller = new StudentController(model, view);

      controller.updateView();

      //更新模型数据

      controller.setStudentName("John");

      controller.updateView();

   }

   private static Student retriveStudentFromDatabase(){

      Student student = new Student();

      student.setName("Robert");

      student.setRollNo("10");

      return student;

   }

}

步骤 5

验证输出。

Student:

Name: Robert

Roll No: 10

Student:

Name: John

Roll No: 10