diff --git a/Beginner/Fibonacci.java b/Beginner/Fibonacci.java
new file mode 100644
index 0000000..8e2fccc
--- /dev/null
+++ b/Beginner/Fibonacci.java
@@ -0,0 +1,18 @@
+import java.util.Scanner;
+
+public class Fibonacci {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.print("Enter the number of terms: ");
+        int n = sc.nextInt();
+
+        int a = 0, b = 1;
+        System.out.print("Fibonacci Sequence: ");
+        for(int i = 1; i <= n; i++){
+            System.out.print(a + " ");
+            int next = a + b;
+            a = b;
+            b = next;
+        }
+    }
+}
diff --git a/Beginner/Palindrome.java b/Beginner/Palindrome.java
new file mode 100644
index 0000000..959ea4c
--- /dev/null
+++ b/Beginner/Palindrome.java
@@ -0,0 +1,15 @@
+import java.util.Scanner;
+
+public class Palindrome {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.print("Enter a string: ");
+        String str = sc.nextLine();
+        String reversed = new StringBuilder(str).reverse().toString();
+        if(str.equals(reversed)){
+            System.out.println(str + " is a palindrome.");
+        } else {
+            System.out.println(str + " is not a palindrome.");
+        }
+    }
+}
diff --git a/Beginner/calculator.java b/Beginner/calculator.java
new file mode 100644
index 0000000..aa4992d
--- /dev/null
+++ b/Beginner/calculator.java
@@ -0,0 +1,36 @@
+import java.util.Scanner;
+
+public class Calculator {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+
+        System.out.print("Enter first number: ");
+        double num1 = sc.nextDouble();
+
+        System.out.print("Enter second number: ");
+        double num2 = sc.nextDouble();
+
+        System.out.print("Choose operation (+, -, *, /): ");
+        char op = sc.next().charAt(0);
+
+        double result;
+
+        switch(op){
+            case '+': result = num1 + num2; break;
+            case '-': result = num1 - num2; break;
+            case '*': result = num1 * num2; break;
+            case '/': 
+                if(num2 != 0) result = num1 / num2;
+                else {
+                    System.out.println("Cannot divide by zero.");
+                    return;
+                }
+                break;
+            default:
+                System.out.println("Invalid operator");
+                return;
+        }
+
+        System.out.println("Result: " + result);
+    }
+}
diff --git a/Beginner/prime-checker.java b/Beginner/prime-checker.java
new file mode 100644
index 0000000..9035fca
--- /dev/null
+++ b/Beginner/prime-checker.java
@@ -0,0 +1,27 @@
+import java.util.Scanner;
+
+public class PrimeNumber {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.print("Enter a number: ");
+        int num = sc.nextInt();
+        boolean isPrime = true;
+
+        if(num <= 1) {
+            isPrime = false;
+        } else {
+            for(int i = 2; i <= Math.sqrt(num); i++){
+                if(num % i == 0){
+                    isPrime = false;
+                    break;
+                }
+            }
+        }
+
+        if(isPrime){
+            System.out.println(num + " is a prime number.");
+        } else {
+            System.out.println(num + " is not a prime number.");
+        }
+    }
+}
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..26c5e2e
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,25 @@
+# Contributing to Java-Programs
+
+Thank you for considering contributing to this repository! Here's how you can help:
+
+## How to Contribute
+
+1. **Fork the repository**: Click on the "Fork" button at the top-right corner of this page.
+2. **Clone your fork**: `git clone https://github.com/your-username/Java-Programs.git`
+3. **Create a new branch**: `git checkout -b feature/your-feature`
+4. **Make your changes**: Implement your feature or fix.
+5. **Commit your changes**: `git commit -m 'Add feature: your-feature'`
+6. **Push to your branch**: `git push origin feature/your-feature`
+7. **Open a pull request**: Go to the "Pull Requests" tab and click "New Pull Request".
+
+## Code Style
+
+- Follow Java naming conventions.
+- Write clear and concise commit messages.
+- Ensure your code is properly indented and formatted.
+
+## Issues
+
+If you find any bugs or have suggestions, please open an issue before submitting a pull request.
+
+Happy coding!