Class with methods to check if enterde ip and port are valid.

src/main/java/java/src/Input/NetworkController.java

@@ -0,0 +1,41 @@
+package java.src.Input;
+
+import java.net.InetAddress;
+import java.net.NetworkInterface;
+import java.net.ServerSocket;
+import java.util.Enumeration;
+
+public class NetworkController {
+    public static boolean hasNetworkInterfaceWithIP(String ipAddressAsString) {
+        try {
+            InetAddress ipAddress = InetAddress.getByName(ipAddressAsString);
+            Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
+
+            while (networkInterfaces.hasMoreElements()) {
+                NetworkInterface networkInterface = networkInterfaces.nextElement();
+                Enumeration<InetAddress> interfaceAddresses = networkInterface.getInetAddresses();
+
+                while (interfaceAddresses.hasMoreElements()) {
+                    InetAddress address = interfaceAddresses.nextElement();
+                    if (address.equals(ipAddress)) {
+                        return true;
+                    }
+                }
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        // No network interface found with the specified IP
+        return false;
+    }
+
+    public static boolean isPortFree(int port) {
+        try (ServerSocket serverSocket = new ServerSocket(port)) {
+            // If the ServerSocket can be created without exception, the port is free
+            return true;
+        } catch (Exception e) {
+            // If an exception occurs, it means the port is already in use
+            return false;
+        }
+    }
+}