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CRUD Operations in Java

CRUD stands for Create, Read/Retrieve, Update, and Delete, which are the fundamental operations carried out on persistent storage. CRUD involves the use of standardized HTTP methods and is focused on data operations. CRUD operations are data-centric and align with the standardized utilization of HTTP methods. CRUD operations in Java refer to the fundamental operations you can perform on data in a database or data structure. These operations are necessary for maintaining and modifying data in a wide range of applications, from simple managing database systems to complex data storage systems.

These are the standard CRUD operations:

  • POST: The technique is used to send data to a certain resource to be processed. On the server, a new resource is created.
  • GET: The method requests data from a specified resource. It takes existing data from the server and reads or retrieves it without changing it.
  • PUT: The method updates existing data on the server. It sends data to be stored at a specific resource location, replacing the resource's current content.
  • DELETE: The method is used to remove data from a specified resource. The resource is removed from the server and is no longer accessible as a result.

Make a menu with the following four basic operations: Add, Search, Remove, and Show Student Details.

CRUD Operations in Java

Explanation of each operation:

Create (C):

  • When performing the "Create" procedure, new data records are added to a data storage.
  • In Java, this typically involves inserting new records into a database or adding new objects to a collection or data structure.
  • For databases, you can use SQL statements (e.g., INSERT INTO) or Object-Relational Mapping (ORM) frameworks like Hibernate or JPA to create records.

Read (R):

  • The "Read" operation is about retrieving data from a data store.
  • Java allows you to access data from a variety of sources, including external APIs, files, and databases.
  • For databases, you can use SQL queries (e.g., SELECT) or Java libraries like JDBC to retrieve data.
  • Reading data from files involves file I/O operations, and for external APIs, you use HTTP requests and JSON/XML parsing to fetch and parse data.

Update (U):

  • To modify already-existing data records, utilize the "Update" operation.
  • In Java, you can update data in a database by executing SQL statements (e.g., UPDATE) or using ORM frameworks.
  • For collections or data structures, you directly update the objects by modifying their attributes.

Delete (D):

  • The "Delete" procedure includes deleting data records from a data the server.
  • In Java, you can delete data from a database using SQL statements (e.g., DELETE FROM) or ORM frameworks.
  • For collections or data structures, you remove objects or elements from the collection.

CRUD Operations for Student Management System in Java

A Student Management System is a crucial application in educational institutions that allows efficient management of student data. The fundamental capabilities which allow for the processing of this data within a database are known as CRUD operations (Create, Read, Update, and Delete). There will be four primary choices on the menu: Add, Search, Remove, and Display student information.

Files to be created:

1. serves as the main program file. It handles user interaction through a menu-driven approach, allowing users to add, delete, update, search, and display student records. The class instantiates the StudentRecordManagement class and provides a user interface for managing student data.

2. contains the StudentRecordManagement class, which encapsulates the logic for managing student records. It includes methods to add, delete, update, search, and display student records using a LinkedList data structure. The class ensures operations like adding new records, updating existing ones, and searching for records based on user input.

3. defines the `Record` class, representing individual student records. It includes private instance variables for name, idNumber, and contactNumber, along with constructors, getters, setters, and a toString() method. This class encapsulates the data structure for each student record, enabling the program to store and manipulate student information effectively.


Step 1: Initialize Classes and Imports

  • Import necessary Java packages: Java.util.Scanner and Java.util.LinkedList.
  • Define a class Record with private instance variables for name, idNumber, and contactNumber.
  • Implement constructors, getters, setters, and toString() method for the Record class.

Step 2: Create StudentRecordManagement Class

  • Define a class StudentRecordManagement to manage student records.
  • Declare a LinkedList of Record objects.
  • Implement methods within the class for add, delete, update, search, and display operations.

Step 3: Main Method Initialization

  • Inside StudentRecordManagement class, create the main method.
  • Instantiate StudentRecordManagement class.
  • Hard code a sample student record and add it to the linked list.

Step 4: User Menu

  • Implement a simple text-based menu for user interaction with options:
    • Add a new student record.
    • Delete a student record that already exists.
    • Update the existing record of the student.
    • Search for a student record.
    • Display all student records.
    • Exit the program.

Step 5: User Input Handling

  • Use the Scanner class to handle user input for various operations.

Step 6: Implement Add Operation

  • Prompt user for student information (ID number, contact number, name).
  • Please create a new Record object with the provided data and add it to the linked list.

Step 7: Implement Delete Operation

  • Prompt the user for the ID number of the student to be deleted.
  • Search the linked list for the student record with the given ID number and remove it.

Step 8: Implement Update Operation

  • Prompt the user for the ID number of the student to be updated.
  • Search the linked list for the student record with the given ID number.
  • Prompt users for new information and update the student record.

Step 9: Implement Search Operation

  • Prompt the user for the ID number of the student to be searched.
  • Search the linked list for the student record with the given ID number and display it if found.

Step 10: Implement Display Operation

  • Iterate through the linked list and print each student record.







CRUD Operations in Java


CRUD Operations in Java


CRUD Operations in Java


CRUD Operations in Java


CRUD Operations in Java


CRUD Operations in Java

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