title: Join two csv files into one  in java
body: <p>I have two csv files with multiple columns from multiple tables.I am using opencsv to make csv files.
  I want to make one csv file containing all the columns from both files.
  There is one common column in both the files.
  But number of records are  not same.
  Please suggest something. Any help would be appreciated.</p>
  
  <p>P.S.: Joining two files simply mean i want to add all the columns in one file..It is not the database join .
  I want the combined csv file and use it to in some tool to generate a pdf</p>