BAEL-3505: Added util class to check server connection (#9013)

* BAEL-3505: Added util class to check server connection

* fixed formatting

* removed unnecessary sout

core-java-modules/core-java-networking-2/src/main/java/com/baeldung/connectexception/ConnectionChecker.java

@@ -0,0 +1,24 @@
+package com.baeldung.connectexception;
+
+import java.net.ConnectException;
+import java.net.Socket;
+
+public class ConnectionChecker {
+    public static void main(String[] args) {
+        String host = "localhost";
+        int port = 5000;
+
+        try {
+            Socket clientSocket = new Socket(host, port);
+
+            // successfully connected to host, do something with opened socket
+
+            clientSocket.close();
+        } catch (ConnectException e) {
+            // host and port combination not valid
+            e.printStackTrace();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}