Add blocking TCP server

.github/workflows/ci.yml

@@ -0,0 +1,26 @@
+name: Java CI with Maven
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v2
+        with:
+          java-version: '11'
+          distribution: 'adoptopenjdk'
+
+      - name: Build with Maven
+        run: mvn clean install
+
+      - name: Run tests
+        run: mvn test

src/main/java/org/example/App.java

@@ -2,6 +2,6 @@
 
 public class App {
     public static void main(String[] args) {
-        System.out.println("Hello There!");
+        new TcpServer(8080).start();
     }
-}
+}

src/main/java/org/example/TcpServer.java

@@ -0,0 +1,28 @@
+package org.example;
+
+import java.io.IOException;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+public class TcpServer {
+
+    private final int port;
+
+    public TcpServer(int port) {
+        this.port = port;
+    }
+
+    public void start() {
+        System.out.println("Starting TCP server on port " + port);
+
+        try (ServerSocket serverSocket = new ServerSocket(port)) {
+            while (true) {
+                Socket clientSocket = serverSocket.accept(); // blockerar
+                System.out.println("Client connected: " + clientSocket.getRemoteSocketAddress());
+                clientSocket.close();
+            }
+        } catch (IOException e) {
+            throw new RuntimeException("Failed to start TCP server", e);
+        }
+    }
+}