Searching for available port method

server/src/main/java/server/PortChecker.java

@@ -0,0 +1,39 @@
+package server;
+
+import java.io.IOException;
+import java.net.ServerSocket;
+
+public class PortChecker {
+    private int defaultPort = 8080;
+    private int lastPort = 8090; // To limit the amount of ports to look for availability
+
+    /**
+     * Finds a free port to launch the program on
+     * made with the help of https://medium.com/@rrlinus5/find-available-port-in-your-system-java-f532ee48c5b3
+     * @return the port that will be used to launch the program
+     * @throws IOException when no available port is found
+     */
+    public int findFreePort() throws IOException {
+        for (int port = defaultPort; port <= lastPort; port++) {
+            if(isPortAvailable(port)){
+                return port;
+            }
+        }
+        throw new IOException("No free port found");
+    }
+
+    /**
+     * Checks whether a port is actually available
+     * @param port the number of the port that's being checker
+     * @return whether the port was available
+     */
+    public boolean isPortAvailable(int port){
+        try(ServerSocket socket = new ServerSocket(port)){
+            return true;
+        }catch(IOException i) {
+            return false;
+        }
+    }
+}
+
+