Random generation of 4-bit verification code, the user input and verify that the input is correct, if the input error to generate a new verification code to allow users to re-enter, up to 5 times

1         //four-bit random verification code2Random ran=NewRandom ();3String str1 = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIGKLMNOPQRSTUVWXUZ";4         Char[] A=New Char[4];5          for(inti=0;i<4;i++)6         {7A[i]=str1.charat (Ran.nextint (62));8         }9         TenStringBuilder rzm1=NewStringBuilder (); One          for(inti=0;i<4;i++) A         { -Rzm1.append (A[i]);//Generate 4-bit authentication code -         } theSYSTEM.OUT.PRINTLN ("Authentication code is" +rzm1); -String rzm2=NewString (RZM1);//Convert authentication code to string -Scanner sc =NewScanner (system.in); -System.out.print ("Please enter the verification code");  +          -          for(intj=0;j<5;j++) +         { A             if(Sc.nextline (). Equals (rzm2)) at             { -SYSTEM.OUT.PRINTLN ("Input correct");  -             } -             Else -             { -                 if(j<4) in                 { -System.out.println ("Enter the verification code again");  to                 } +                 Else -                 { theSystem.out.println ("The number of inputs has run out"); *                 } $             }Panax Notoginseng         } -         

Random generation of 4-bit verification code, the user input and verify that the input is correct, if the input error to generate a new verification code to allow users to re-enter, up to 5 times