java - generate a random number for a credit card -



java - generate a random number for a credit card -

i trying utilize method generate credit card number of 16 digits starts 4 if issuersymbol equals issuer amer express. random number has start 3 if issuersymbol equals issuer visa , 5 it issuer master card.

public integer getissuercode(string issuersymbol){ int randominteger = 0; random random = new random(); for(int = 0; < 5; i++) { randominteger = random.nextint(); if (issuersymbol.equals(issuer_amer_express)) { } else { system.out.println("error"); } if(issuersymbol.equals(issuer_visa)){ } else{ system.out.println("error"); } if (issuersymbol.equals(issuer_master_card)){ } else{ system.out.println("error"); } } homecoming randominteger; }

i think have problem if , else. need understand go in else if if not true code should changed them if else if , else ...

if (issuersymbol.equals(issuer_amer_express)) { } else if(issuersymbol.equals(issuer_visa)){ } else if (issuersymbol.equals(issuer_master_card)){ } else { system.out.println("error"); }

another suggestion random class includes nextint(int) (per javadoc) *returns pseudorandom, uniformly distributed int value between 0 (inclusive) , specified value (exclusive), drawn random number generator's sequence.

randominteger = 3 + random.nextint() % 3;

or

randominteger = 3 + random.nextint(3);

this ensure randominteger in 3 or 4 or 5

java java-ee

Comments

Post a Comment

Popular posts from this blog

Delphi change the assembly code of a running process -

Delphi change the assembly code of a running process - i'm trying alter address 00741fa5 has push test.009e721c . alter push test.009e71c8 . procedure callback; asm force $9e71c8 end; procedure tform2.btn1click(sender: tobject); var ppid :dword; pprocess : cardinal; begin getwindowthreadprocessid(findwindow(nil,pchar('test')), @ppid); pprocess := openprocess(process_all_access, false, ppid); injectasm(pprocess, $741fa5, 10, integer(@callback), 0); end; here injectasm function (with error checking) function injectasm(process: longword; injectaddress, injectsize, codeaddress, codesize : integer): pointer; var csize, rsize : integer; replaced : array of byte; jmp : array [0..4] of byte; jmpaddress : integer; nopv : byte; : integer; nbr: ulong_ptr; begin //injectsize must equal or greater 5, because need space our //(far) jmp wwxxyyzz instruction //if there's no space, inject in place of few instructions if injectsize ...
Read more

json - Hibernate and Jackson (java.lang.IllegalStateException: Cannot call sendError() after the response has been committed) -

json - Hibernate and Jackson (java.lang.IllegalStateException: Cannot call sendError() after the response has been committed) - hello have problem hibernate , jackson. have 2 pojos @entity @table(name = "users") public class user implements serializable { static final long serialversionuid = 4235637833262722256l; @id @generatedvalue private int id; @column(name = "creation_date") private date creationdate; @column(name = "first_name") private string firstname; @column(name = "last_name") private string lastname; @version @column(name = "version") private int version; @column(name = "e_mail") private string email; @column(name = "enabled") private boolean enabled; @column(name = "login") private string login; @column(name = "password") private string password; @jsonmanagedreference("role") @onetomany(mappedby = "user", cascade = cascadetype.all,fetch = fetchtyp...
Read more

C++ 11 "class" keyword -

C++ 11 "class" keyword - i've started using c++ 11 little bit more , have few questions on special uses of class keyword. know it's used declare class, there's 2 instances have seen don't understand: method<class t>(); and class class_name *var; why precede typename keyword class in first example, , keyword pointer in sec example? that known elaborated type specifier , necessary when class name "shadowed" or "hidden" , need explicit. class t { }; // love of god don't t t; t t2; if compiler smart, give these warnings: main.cpp:15:5: error: must utilize 'class' tag refer type 't' in scope t t2; ^ class main.cpp:14:7: note: class 't' hidden non-type declaration of 't' here t t; ^ if class not defined, deed forwards declaration. for example: template <typename t> void method() { using type = typename t::value_type; } method...
Read more