Friend.java

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
/**
 * a class for both client and server.
 * it can send and get data.
 * the data that  a friend send,is a String.
 * a string that refers to what song the friend is listening.
 * don't forget in constructor you should give port and ip of client and server/
 *
 * @author pouyan hesabi and omidmahyar.
 * @version 1.0
 * @since 6/29/2019
 */
public class Friend {

    volatile private String myIpHost;
    volatile private int myPort;
    volatile private String clientIpHost;
    volatile private int clientPort;
    volatile private String inputData;


    volatile private String username;
    volatile private static ArrayList<String> allData = new ArrayList<>(50);

    public static synchronized ArrayList<String> getAllData() {
        return allData;
    }

    public synchronized String getInputData() {
        return inputData;
    }

    public synchronized void setInputData(String inputData) {
        this.inputData = inputData;
    }

    public Friend(String username, String myIpHost, int myPort, String clientIpHost, int clientPort) {
        this.username = username;
        this.myIpHost = myIpHost;
        this.myPort = myPort;
        this.clientIpHost = clientIpHost;
        this.clientPort = clientPort;
        new Thread(new ServerThread()).start();
    }

    /**
     * a method that send the string that show a friend is listening the music with specific time and username.
     * it doesn't return anything.
     *
     * @param outputData
     * @throws IOException
     */
    public synchronized void sendData(String outputData) throws IOException {
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("HH:mm");
        Date date = new Date();
        String currentTime = simpleDateFormat.format(date);
        Socket client = new Socket(clientIpHost, clientPort);
        DataOutputStream out = new DataOutputStream(client.getOutputStream());
        String pass = "\t" + currentTime + "\n" + outputData;
        out.writeUTF(username + pass);
        //System.out.println(username+pass);
//        getAllData().add(username+pass);
//        mainFrame.getCopyOfAllData().add(username+pass);
        out.flush();
        client.close();
    }


    /**
     * a class that implements an interface class(Runnable)
     * only one method that get data with DataInputStream and throws IOException.
     *
     * @author pouyan hesabi and omid mahyar.
     * @version 1.0
     * @see java.io.DataInputStream
     * @see java.lang.Thread
     */
    private class ServerThread implements Runnable {

        @Override
        public synchronized void run() {
            Socket socket = null;
            ServerSocket server = null;
            int i = 0;
            try {
                server = new ServerSocket(myPort);
                while (true) {
                    socket = server.accept();
                    DataInputStream in = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
                    setInputData(in.readUTF());
                    System.out.println(getInputData());
                    getAllData().add(getInputData());
                    //getAllData().add(getInputData());
                    socket.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}