title: insert into an array from an arraylist
body: <p>i am doing a hotel room booking system.</p>
  
  <p>i created two array list which is days and rooms.</p>
  
  <p>i created buttons to add value into array list.
  example: if monday clicked, then ("monday") inserted into days's array list.
  if monday and tuesday clicked, then ("monday") and ("tuesday) inserted into days's array list.</p>
  
  <p>now after all the information is done  how do i insert the array list which is days and rooms
  into a array, which this array is to function is to store these information as a booking, then use this array to compare with another booking array weather the room being booked or not</p>