update:demo8

com/study/demo8/TCPClient.java

@@ -0,0 +1,22 @@
+package com.study.demo8;
+
+import java.io.PrintWriter;
+import java.net.Socket;
+
+public class TCPClient {
+    public static void main(String[] args) {
+        try {
+            Socket socket = new Socket("localhost", 8888);
+            System.out.println("Connected to server.");
+
+            PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
+            out.println("Hello Server");
+            System.out.println("Sent message to server.");
+
+            out.close();
+            socket.close();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}