Socket

package mypack;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class Server_Socket {
    public static final int PORT = 8088;
    public static void main(String[] args) throws IOException {
        ServerSocket s = new ServerSocket(PORT);
        System.out.println("Started: " + s);

        try {
            Socket socket = s.accept();
            try {
                System.out.println("Connection accpted: " + socket);
                BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);
                while(true) {
                    String str = in.readLine();
                    if(str.equals("END")) break;
                    System.out.println("Echoing: " + str);
                    out.println(str + str + "  haha");
                }
            }finally {
                System.out.println("closing...");
                socket.close();
            }
        }finally {
            s.close();
        }
    }
}

package mypack;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.util.Scanner;

public class Client_Socket {
    public static void main(String[] args) throws IOException {
        InetAddress addr = InetAddress.getByName(null);
        System.out.println("addr = " + addr);
        Socket socket = new Socket(addr, Server_Socket.PORT);
        try {
            System.out.println("socket = " + socket);
            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);
            Scanner cin = new Scanner(System.in);
            while(cin.hasNextLine()) {
                String temp = cin.nextLine();
                out.println(temp);
                String str = in.readLine();
                System.out.println(str);
                if(temp.equals("END")) break;
            }
        }finally {
            System.out.println("closing...");
            socket.close();
        }
    }
}