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CRUD Operations in Student Management System in Java

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CRUD stands for Create, Read/Retrieve, Update and Delete and these are the four basic operations that we perform on persistence storage. CRUD is data-oriented and the standardized use of HTTP methods. HTTP has a few methods which work as CRUD operations and do note they are very vital from a developmental point perspective in programming that also does helps us relate better web development and also aids us while dealing with databases. So, standard CRUD Operations are as follows:

  • POST: Creates a new resource
  • GET: Reads/Retrieve a resource
  • PUT: Updates an existing resource
  • DELETE: Deletes a resource

In order to illustrate CRUD operations over the Student Management program, let us consider we are creating a MENU DRIVER program that will have a student list. The list will hold the student object that contains student details. Your menu should have 4 basic operations like Add, Search, Remove, and Show details of the student.

Implementation:

Menu

The task to be operated are as follows:

Create a student Record Management system that can perform the following operations:

  • Insert Student record.
  • Delete student record
  • Show student record
  • Search student record

The student record should contain the following items

  1.  Student ID
  2.  Name of Student
  3. Contact Number of Student

We will be creating the below files as listed as follows:

  1. StudentRecordLinkedList: To create the Menu ask for the Function to perform
  2. StudentRecordManagement: Contains all the Function that does Operation.
  3. Record: To Store the Data.

A. File: StudentRecordLinkedList.java

Java




// Java Program to Illustrate StudentRecordLinkedList Class
 
package College;
 
// Importing required classes
import java.util.Scanner;
 
// Class
public class StudentRecordLinkedList {
 
    // Main driver method
    public static void main(String[] args)
    {
 
        // Creating HumanResourceOffice Object.
        StudentRecordManagement hr
            = new StudentRecordManagement();
 
        Record record = new Record();
        .
            // Initial Employee record
            // Using mutators to had code the data
            record.setIdNumber(6862);
        record.setContactNumber(911);
        record.setName("Ankit");
 
        // Calling add() record method to
        // add static data/(Hard CodedData) to linked List
        hr.add(record);
 
        // Creating Scanner Object to read input
        Scanner input = new Scanner(System.in);
 
        // Creating option integer variable
        int option = 0;
 
        // Do - While loop
        do {
            menu();
            option = input.nextInt();
 
            // Switch case
            switch (option) {
 
            // Case 1
            case 1:
 
                // Display message
                System.out.print(
                    "What is the Student id Number ? ");
 
                int idNumber = input.nextInt();
 
                // Display message
                System.out.print(
                    "What is the Student contact Number ? ");
 
                int contactNumber = input.nextInt();
                input.nextLine();
 
                // Display message
                System.out.print(
                    "What is the Student Name ? ");
 
                String name = input.nextLine();
 
                // Create record object and pass constructor
                // parameters.
                record = new Record(name, idNumber,
                                    contactNumber);
                // Call add() record
                hr.add(record);
                System.out.println(record.toString());
 
                // Break statement used to terminate program
                // from here only once it entered this case
                break;
 
            // Case 2
            case 2:
 
                // Display message
                System.out.print(
                    "What is the Student id number ? ");
                int rId = input.nextInt();
 
                // Invoke remove/delete record
                hr.delete(rId);
 
                break;
 
            // Case 3
            case 3:
 
                // Display message
                System.out.print(
                    "What is the Student id number? ");
 
                int rIdNo = input.nextInt();
                hr.update(rIdNo, input);
 
                break;
 
            // Case 4
            case 4:
 
                // Display message
                System.out.print(
                    "What is the Student id ? ");
                int bookId = input.nextInt();
 
                if (!hr.find(bookId)) {
                    System.out.println(
                        "Student id does not exist\n");
                }
 
                break;
 
            // Case 5
            case 5:
                hr.display();
                break;
 
            // Case 6
            case 9:
 
                // Display message
                System.out.println(
                    "\nThank you for using the program. Goodbye!\n");
                System.exit(0);
 
                break;
 
            // Case 7: Default case
            // If none above case executes
            default:
 
                // Print statement
                System.out.println("\nInvalid input\n");
                break;
            }
        }
 
        // Checking condition
        while (option != 9);
    }
 
    // Method 2
    // Menu - Static menu for displaying options
    public static void menu()
    {
 
        // Printing statements displaying menu on console
        System.out.println("MENU");
        System.out.println("1: Add Student");
        System.out.println("2: Delete Student");
        System.out.println("3: Update Student");
        System.out.println("4: Search Student");
        System.out.println("5: Display Students");
        System.out.println("9: Exit program");
        System.out.print("Enter your selection : ");
    }
}


B. File: StudentRecordManagement.java

Java




// Java Program to Illustrate StudentRecordManagement Class
 
package College;
 
// Importing required classes
import java.util.LinkedList;
import java.util.Scanner;
 
// Class
public class StudentRecordManagement {
 
    // Creating an empty LinkedList
    LinkedList<Record> list;
 
    // Default Constructor
    public StudentRecordManagement()
    {
        list = new LinkedList<>();
    }
 
    // Method 1
    // Adding Record
    // @param record
    public void add(Record record)
    {
 
        // Checking if a record already exists or not,
        // if not add it to Record list, Otherwise
        // error display message
        if (!find(record.getIdNumber())) {
            list.add(record);
        }
        else {
 
            // Print statement
            System.out.println(
                "Record already exists in the Record list");
        }
    }
 
    // Method 2
    // Searching Record
    // @param idNumber
    //  @return
    public boolean find(int idNumber)
    {
 
        // Iterating record list
        // using for each loop
        for (Record l : list) {
 
            // Checking record by id Number
            if (l.getIdNumber() == idNumber) {
 
                System.out.println(l);
                return true;
            }
        }
        return false;
    }
 
    // Method 3
    // Delete Record
    // @param recIdNumber
    public void delete(int recIdNumber)
    {
        Record recordDel = null;
 
        // Iterating record list
        for (Record ll : list) {
 
            // Finding record to be deleted by id Number
            if (ll.getIdNumber() == recIdNumber) {
                recordDel = ll;
            }
        }
 
        // If recordDel is null, then show error message,
        // otherwise remove the record from Record list
        if (recordDel == null) {
 
            // Displaying no record found
            System.out.println("Invalid record Id");
        }
        else {
 
            list.remove(recordDel);
 
            // Display message for successful deletion of
            // record
            System.out.println(
                "Successfully removed record from the list");
        }
    }
 
    // Method 4
    // Finding Record
    // @param idNumber
    // @return
    public Record findRecord(int idNumber)
    {
 
        // Iterate Record list
        // using for each loop
        for (Record l : list) {
 
            // Checking record by id Number.
            if (l.getIdNumber() == idNumber) {
                return l;
            }
        }
 
        return null;
    }
 
    // Method 5
    // Update Record
    // @param id
    // @param input
    public void update(int id, Scanner input)
    {
 
        if (find(id)) {
            Record rec = findRecord(id);
 
            // Display message only
            System.out.print(
                "What is the new Student id Number ? ");
            int idNumber = input.nextInt();
 
            // Display message only
            System.out.print(
                "What is the new Student contact Number ");
            int contactNumber = input.nextInt();
            input.nextLine();
 
            // Display message only
            System.out.print(
                "What is the new Student Name ? ");
            String name = input.nextLine();
 
            rec.setIdNumber(idNumber);
            rec.setName(name);
            rec.setContactNumber(contactNumber);
            System.out.println(
                "Record Updated Successfully");
        }
        else {
 
            // Print statement
            System.out.println(
                "Record Not Found in the Student list");
        }
    }
 
    // Method 6
    // Display Records
    public void display()
    {
 
        // If record list is empty then
        // print the message below
        if (list.isEmpty()) {
 
            // Print statement
            System.out.println("The list has no records\n");
        }
        // Iterating Record list
        // using for each loop
        for (Record record : list) {
 
            // Printing the list
            System.out.println(record.toString());
        }
    }
}


C. File: Record.java

Java




// Java Program to Illustrate Record Class
 
package College;
 
// Class
public class Record {
 
    // Instance variables
    private String name;
    private int idNumber;
    private int contactNumber;
 
    // Default Constructor
    public Record() {}
 
    // Parameterized Constructor
    // @param name
    // @param idNumber
    // @param contactNumber
    public Record(String name, int idNumber,
                  int contactNumber)
    {
 
        // this keyword refers to current instance itself
        this.name = name;
        this.idNumber = idNumber;
        this.contactNumber = contactNumber;
    }
 
    // Getting the value of contactNumber
    // @return the value of contactNumber
    public int getContactNumber() { return contactNumber; }
 
    // Set the value of contactNumber
    // @param contactNumber new value of contactNumber
    public void setContactNumber(int contactNumber)
    {
 
        this.contactNumber = contactNumber;
    }
 
    // Getting the value of idNumber
    // @return the value of idNumber
    public int getIdNumber() { return idNumber; }
 
    // Setting the value of idNumber
    // @param idNumber new value of idNumber
    public void setIdNumber(int idNumber)
    {
        this.idNumber = idNumber;
    }
 
    // Getting the value of name
    // @return the value of name
    public String getName() { return name; }
 
    // Setting the value of name
    // @param name new value of name
    public void setName(String name) { this.name = name; }
 
    // toString() Method
    // @return
    @Override public String toString()
    {
 
        // Returning the record
        return "Records{"
            + "name=" + name + ", idNumber=" + idNumber
            + ", contactNumber=" + contactNumber + '}';
    }
}


Output:

Add

 

Update

 

Search

 

Display

 

Delete

 

Exit

 



Last Updated : 21 Feb, 2023
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