public static void main(String[] args) {
    String inClear = "ABCDE Hello have a nice day. Goodbye!";
    String encrypt = "";
    for (int i = 0; i < inClear.length(); i++) {
      char c = inClear.charAt(i);
      encrypt += (char) (c + 3);
    }
    System.out.println(encrypt);//DEFGH#Khoor#kdyh#d#qlfh#gd|1#Jrrge|h$
  }