Add Some comments at proper place and remove indentation error.

java/FuckingCoffee.java

@@ -1,25 +1,29 @@
 import java.net.*;
 import java.io.*;
- 
-public class FuckingCoffee{
+
+public class FuckingCoffee{   // creating a class
 
     private static final String MY_USERNAME = "my_username";
     private static final String PASSWORD_PROMPT = "Password: ";
     private static final String PASSWORD = "1234";
     private static final String COFFEE_MACHINE_IP = "10.10.42.42";
     private static int DELAY_BEFORE_BREW = 17;
     private static int DELAY = 24;
-
-    public static void main(String[] args)throws Exception{
-        for(int i =  1; i< args.length ; i++){
+
+    public static void main(String[] args)throws Exception
+    {
+        for(int i = 1; i< args.length; i++)
+        {
             if(!args[i].contains(MY_USERNAME)){
                 return;
             }
         }
+
         Socket telnet = new Socket(COFFEE_MACHINE_IP, 23);
         PrintWriter out = new PrintWriter(telnet.getOutputStream(), true);
         BufferedReader in = new BufferedReader(new InputStreamReader(telnet.getInputStream()));
         Thread.sleep(DELAY_BEFORE_BREW*1000);
+
         if(!in.readLine().equals(PASSWORD_PROMPT)){
             return ;
         }

python3/fucking_coffee.py

@@ -13,22 +13,22 @@
 
 def main():
     # Exit early if no sessions with my_username are found.
-    if not any(s.startswith(b'my_username ') for s in sh('who').split(b'\n')):
+    if not any(s.startswith(b'my_username') for s in sh('who').split(b'\n')):
         return
 
-    time.sleep(17)
+    time.sleep(17) # sleep system for 17 seconds
 
-    conn = telnetlib.Telnet(host=COFFEE_MACHINE_ADDR)
+    conn = telnetlib.Telnet(host=COFFEE_MACHINE_ADDR)  #creating the connection
     conn.open()
     conn.expect([COFFEE_MACHINE_PROM])
     conn.write(COFFEE_MACHINE_PASS)
 
     conn.write('sys brew')
-    time.sleep(64)
+    time.sleep(64)    # sleep system for 16 seconds
 
     conn.write('sys pour')
-    conn.close()
+    conn.close()     # closing the connection
 
 
-if __name__ == '__main__':
+if __name__ == '__main__':  #check__name__ is equal to __main__ or  not.
     main()