ClientServer.java

package com.socket;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

class ClientServer {
    FileInputStream fin = null;
    FileOutputStream fout = null;
    InputStream in = null;
    OutputStream out = null;
    Socket socket;

    void receiveFile() throws IOException {
        in = socket.getInputStream();
        fout = new FileOutputStream("myoutputfile.exe");

        int c;
        System.out.println("File incoming......");
        while((c = in.read()) != -1) {
            fout.write(c);
        }
        System.out.println("Finished");
        fout.close();
        fout = null;
    }

    void sendFile() throws IOException {
        out = socket.getOutputStream();
        fin = new FileInputStream("myinputfile.exe");

        int c;
        System.out.println("Transferring file...");
        while((c = fin.read()) != -1) {
            out.write(c);
        }
        System.out.println("Finished");
        fin.close();
        fin = null;
    }
}