title: generate bank account number with random
body: <p>i have a question :
  I can find no explanation on how to generate in java a bank account in the format: BE00 0000 0000 0000. BE must stay and the 0 must be generated randomly. For exemple : BE96 4567 7896 4789.
  Sorry for my english, i'm French.
  Thanks in advance. Have a nice day</p>