Transfer Object Pattern in Java

18 Oct, 2021
It is used when we want to pass data with multiple attributes in one shot from client to server. Transfer Object is a simple POJO class having getter/setter methods and is serialized so that it can be transferred over the network. Server Side business class normally fetches data from the database and fills the POJO and sends it to the client or passes it by value. For clients, the transfer object is read-only. The client can create its own transfer object and pass it to the server to update values in the database in one shot. 
Following are the entities of this type of design pattern:
Approach:
Step 1: Create a Transfer Object
Step 2: Create a Business Object.
Step 3: Use the StudentBO to demonstrate Transfer Object Design Pattern
Step 4: Verify the output.
Step 1: Creating a Transfer Object 
Example
Java
// Transfer Object Pattern - Design Pattern // Step 1// Creating a Transfer Object// randomly be named it 'StudentVO.java' // Class StudentVOpublic class StudentVO {     // Member variables of class   private String name;   private int rollNo;     // Creating a constructor of above class  StudentVO(String name, int rollNo) {         // This keyword for assignment    // to same memory block created    // for every name and roll number of student    this.name = name;      this.rollNo = rollNo;   }     // Getting name of student   public String getName() {      return name;   }     // Setting name of Student   public void setName(String name) {      this.name = name;   }     // Getting roll number of student   public int getRollNo() {      return rollNo;   }     // Setting roll number of student   public void setRollNo(int rollNo) {      this.rollNo = rollNo;   }}
Step 2: Creating a Business Object
Example 
Java
// Transfer Object Pattern - Design Pattern // Step 2// Creating a Busines object// randomly be named it 'StudentBO.java' // Importing List and ArrayList classes of// java.util packageimport java.util.ArrayList;import java.util.List; // Class StudentBOpublic class StudentBO {        // List is working as a database   List<StudentVO> students;   public StudentBO() {        students = new ArrayList<StudentVO>();           // Adding custom inputs      StudentVO student1 = new StudentVO("Robert",0);      StudentVO student2 = new StudentVO("John",1);      students.add(student1);      students.add(student2);          }      public void deleteStudent(StudentVO student) {      students.remove(student.getRollNo());      System.out.println("Student: Roll No " + student.getRollNo() + ", deleted from database");   }      //retrieve list of students from the database   public List<StudentVO> getAllStudents() {      return students;   }      public StudentVO getStudent(int rollNo) {      return students.get(rollNo);   }      public void updateStudent(StudentVO student) {      students.get(student.getRollNo()).setName(student.getName());      System.out.println("Student: Roll No " + student.getRollNo() +", updated in the database");   }}
Step 3: Use the StudentBO to demonstrate Transfer Object Design Pattern
Implementation:  List is acting as DB here as shown in demonstrating Transfer Object Design Pattern.
Example
Java
// Transfer Object Pattern - Design Pattern// Step 3 // Use the StudentBO to demonstrate Transfer Object Design Pattern// randomly be named it 'TransferObjectPatternDemo.java' public class TransferObjectPatternDemo {     // Main driver method   public static void main(String[] args) {            StudentBO studentBusinessObject = new StudentBO();            // Print all students      for (StudentVO student : studentBusinessObject.getAllStudents()) {         System.out.println("Student: [RollNo : " + student.getRollNo() + ", Name : " + student.getName() + " ]");      }            // Update student      StudentVO student = studentBusinessObject.getAllStudents().get(0);           // Custom input      student.setName("Michael");      studentBusinessObject.updateStudent(student);            // Getting the student      student = studentBusinessObject.getStudent(0);      System.out.println("Student: [RollNo : " + student.getRollNo() + ", Name : " + student.getName() + " ]");   }}
Step 4: Verifying output 
Student : [RollNo : 0, Name : Robert ]
Student : [RollNo : 1, Name : John ]
Student : Roll No 0, updated in the database
Student : [RollNo : 0, Name : Michael ]
 
gabaa406
gulshankumarar231
Object-Oriented-Design
Java
Java
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