DEV Community: Srinivasan. R

Encapsulation

Srinivasan. R — Tue, 10 Mar 2026 11:37:22 +0000

Introduction

Object-Oriented Programming (OOP) is one of the most widely used programming paradigms in modern software development.
One of the key principles of OOP is Encapsulation, which helps developers protect data and maintain clean code structure.

In this article, we will understand what encapsulation is and how to implement it in Java.

What is Encapsulation?

Encapsulation means wrapping data (variables) and methods (functions) together inside a single unit called a class.

It also helps to hide sensitive data from direct access by making variables private and controlling access through methods.

**Java Example

class BankAccount {

private double balance;

public void deposit(double amount) {
    balance = balance + amount;
}

public double getBalance() {
    return balance;
}

}

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

    BankAccount acc = new BankAccount();
    acc.deposit(1000);

    System.out.println("Balance: " + acc.getBalance());
}

}

Building a Dynamic Sales Report: Implementing Date Range Filtering in C# Windows Forms

Srinivasan. R — Fri, 09 Jan 2026 09:04:38 +0000

From Date: 01-12-2025 (December 1st)

To Date: 09-01-2026 (January 9th)

As you can see, the DataGridView now populates with a much larger list of bills, and the Total Amount automatically updates to reflect the cumulative sales (17,130.00).

From Date: 01-01-2026

To Date: 09-01-2026

By selecting these dates and clicking the "TOTAL" button, the application filters the records and calculates the total sales for just those 9 days (Total: 420.00).

(Backend)

using (SqlCommand cmd = new SqlCommand(query, connection))
{
// Binding the DateTimePicker values to SQL parameters
cmd.Parameters.AddWithValue("@StartDate", dateTimePickerFrom.Value.ToString("yyyy-MM-dd"));
cmd.Parameters.AddWithValue("@EndDate", dateTimePickerTo.Value.ToString("yyyy-MM-dd"));

SqlDataAdapter adapter = new SqlDataAdapter(cmd);
DataTable dataTable = new DataTable();
adapter.Fill(dataTable);

// Binding data to the Grid
dataGridView1.DataSource = dataTable;

}

Prime number

Srinivasan. R — Sat, 03 Jan 2026 13:39:56 +0000

1. The Logic Building (The Strategy)

The general rule for a Prime number is that it’s only divisible by 1 and itself. However, I realized a common confusion: Composite numbers (like 4) are also divisible by 1 and themselves.

Prime Number (e.g., 5): When divided by every number from 1 to itself, it produces a remainder of zero exactly two times (1 and 5).

Composite Number (e.g., 4): It produces a remainder of zero more than two times (1, 2, and 4).

2. Recipe Writing (The Algorithm)

I treated my code like a recipe:

Input: Get the number.

Loop: Check every number from 1 up to the input number.

Check Remainder: Use the modulo operation (%) to find where the remainder is 0.

Counter: Count how many times the remainder was 0.

Final Result: If the count is exactly 2, it's Prime. Otherwise, it’s Composite.

3. The Ingredients (The Variables)

I gathered my "ingredients" for the Java code:

input: The number to check.

count: To track the number of divisors.

for loop:

Start:1(Initialization)
End:Input(Condition)
Next step:+1(Increment)

if-else: To handle the logic.

Program(Javascript):

var a = 24
var c = 0

for (i = 1; i <= a; i++)
{
if (a % i == 0)
{
c++
}
}

if (c == 2)
{
console.log("Prime")
}
else
{
console.log("Not Prime")

}