Add Java temperature converter

README.md

@@ -1,25 +1,22 @@
 # codex-test
-This is my first manual commit in GitHub.
-This is my second manual update in GitHub.
-This is my third manual change in GitHub.
-This is my fourth manual change in GitHub.
 
-
-# codex-test
-
-This repository contains simple **command-line To-Do List applications** written in both Python and Java.  
-They demonstrate how to build interactive console apps, store data locally, and perform common CRUD operations (Create, Read, Update, Delete).
-
----
+This repository contains simple command-line applications written in Python and Java.
 
 ## Files
-- **todo.py** – Python version (stores tasks in `tasks.json`)
-- **Todo.java** – Java version (stores tasks in `tasks.csv`)
+- **todo.py** – Python to-do list (stores tasks in `tasks.json`)
+- **Todo.java** – Java to-do list (stores tasks in `tasks.csv`)
 - **practice.py** – Additional practice/testing file
-
----
+- **TemperatureConverter.java** – Java temperature conversion utility
 
 ## How to Run – Python Version
-**Requirements:** Python 3.7+  
+**Requirements:** Python 3.7+
 ```bash
 python3 todo.py
+```
+
+## How to Run – Temperature Converter
+**Requirements:** Java 11+
+```bash
+javac TemperatureConverter.java
+java TemperatureConverter
+```

TemperatureConverter.java

@@ -2,6 +2,30 @@
 
 public class TemperatureConverter {
 
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        System.out.println("Temperature Converter");
+        System.out.print("Enter temperature value: ");
+        if (!scanner.hasNextDouble()) {
+            System.out.println("Invalid temperature.");
+            scanner.close();
+            return;
+        }
+        double value = scanner.nextDouble();
+        System.out.print("Convert to (C/F): ");
+        String unit = scanner.next().trim().toUpperCase();
+        if (unit.equals("C")) {
+            double celsius = (value - 32) * 5.0 / 9.0;
+            System.out.printf("%.2f F = %.2f C%n", value, celsius);
+        } else if (unit.equals("F")) {
+            double fahrenheit = value * 9.0 / 5.0 + 32;
+            System.out.printf("%.2f C = %.2f F%n", value, fahrenheit);
+        } else {
+            System.out.println("Unknown unit. Please use 'C' or 'F'.");
+        }
+        scanner.close();
+=======
+
     private static double cToF(double c) {
         return c * 9.0 / 5.0 + 32.0;
     }