Added Gson as dependency, added JSON file creation for user signup

pom.xml

@@ -3,4 +3,14 @@
   <groupId>org.progmethoden</groupId>
   <artifactId>java-chat</artifactId>
   <version>0.0.1-SNAPSHOT</version>
+  
+ <dependencies>
+	  <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
+		<dependency>
+		    <groupId>com.google.code.gson</groupId>
+		    <artifactId>gson</artifactId>
+		    <version>2.10.1</version>
+		</dependency>
+ </dependencies> 
+
 </project>

src/main/java/SignUp.java

@@ -1,3 +1,7 @@
+import com.google.gson.Gson;
+import java.io.FileWriter;
+import java.io.IOException;
+
 public class SignUp {
     private String name;
     private String password;
@@ -25,25 +29,43 @@ public class SignUp {
     this.password = password;
     }
 
-    // Function to create user
+    // Function to create user with validation
     public static SignUp createUser(String name, String password) {
     	if (name == null || name.isEmpty()) {
-            throw new IllegalArgumentException("Username cannot be empty");
+        throw new IllegalArgumentException("Username cannot be empty");
         }
         if (password == null || password.isEmpty()) {
-            throw new IllegalArgumentException("Password cannot be empty");
+        throw new IllegalArgumentException("Password cannot be empty");
         }
         if (password.length() < 6) {
-            throw new IllegalArgumentException("Password must be at least 6 characters long");
+        throw new IllegalArgumentException("Password must be at least 6 characters long");
         }    return new SignUp(name, password);
     }
+    
+ // Function to save to JSON file, replace with database call later
+    public void saveToJsonFile(String filename) {
+        try (FileWriter fileWriter = new FileWriter(filename)) {
+            Gson gson = new Gson();
+            gson.toJson(this, fileWriter);
+            System.out.println("User information saved to " + filename);
+        } catch (IOException e) {
+        System.out.println("Error occurred while saving user information to JSON file: " + e.getMessage());
+        }
+    }
 
     public static void main(String[] args) {
-        // Example 
-    SignUp user = createUser("TestUser", "TestPasswort");
+        try {
+            // Example usage 
+            SignUp user = createUser("Test User", "TestPasswort");
 
-    // Example of accessing properties
-    System.out.println("User Name: " + user.getName());
-    System.out.println("User Password: " + user.getPassword());
+            // Example of accessing properties
+            System.out.println("User Name: " + user.getName());
+            System.out.println("User Password: " + user.getPassword());
+
+            // Save user information to a JSON file
+            user.saveToJsonFile("user.json");
+        } catch (IllegalArgumentException e) {
+            System.out.println("Error: " + e.getMessage());
+        }
     }
 }