Yesterday, I helped my classmates a small program, mainly in order to convert the ID card number from 15 bits into 18. It turned out that when using the subString function, it always passed. Now I have trouble, I haven't seen the original API, now I am listed, and I have reviewed it! The source program is as follows:
Class IDConvert
{Public static void main (String [] ARGS)
{
String T = ""; // 18-digit number, the last value is calculated later
Long R; // The article finally has a comprehensive explanation
String final_id_num;
String ID;
ID = "120103311222265";
LONG N = 0;
String stratailchars = "10x98765432";
Try
{
Long idnum = long.parselong (ID);
IF (id.length ()! = 15)
Throw new Exception ();
}
Catch (IllegalarGumentexception E)
{
System.out.println ("Input is not the correct parameter");
}
Catch (Exception E1)
{
System.out.println ("Enter number bit is incorrect");
}
String id_6_upper = id.substring (0,6); // To add "19" in the original 15-bit number, dismantling two parts
String id_9_lower = id.substring (6,15);
String Original_New_ID = ID_6_UPPER "19" id_9_lower; / / becomes 17-bit number
INT V_LIST [] = {2, 4, 8, 5, 10, 9, 7, 3, 6, 1, 2, 4, 8, 5, 10, 9, 7}; // A array of mantissa
INT I, M, REPEAT = 0;
For (i = 0; i <17; i )
{
M = 16-repeat;
//System.out.println(Repeat);
N = long.parselong (Original_New_id.substring (m, m 1)) * (long) v_list [repeat]; // see the tail instruction
//System.out.println (N);
REPEAT ;
}
R = N% 11; // Taking the corresponding T value (18 digits)
System.out.println (r);
FOR (m = 0; M )
{
IF (r == m)
T = strtailchars.substring (m, m 1);
}
System.out.println (t);
Final_id_num = Original_New_ID T; // 17 Bit Number Monil T
System.out.println (Final_ID_NUM);
}
}
The requirements and conversion rules of the program are as follows:
The ID number is converted from 15 to 18. (the input parameters are command line parameters, output 18 ID number) Error handle processing: a. The ID number entered by the user must be 15 bits, if the input is wrong to give prompt. b. If the user enters the non-digital character, give the prompt information. Tip: When the string is converted into a function, the non-digital character is input. Calculate 18 is ID number: ID number 15 to 18-bit conversion algorithm: 1. The ID number is converted from 15 to 18. (The input parameter is the command line parameter) Error handle processing: a. ID number entered by the user Must be 15 bits, if the input is incorrect to give a prompt. b. If the user enters the non-digital character, give the prompt information. Tip: When the string is converted into a function, the non-digital character is input. 1. Insert 2 century code after the 6 administrative regions (such as 19), constitute four birth year, get 17-digit number; 2. Put the 17-bit number from the high to the lower position with the following 17 digits, each multi - : Tip: INT V_LIST [] = {2, 4, 8, 5, 10, 9, 7, 3, 6, 1, 2, 4, 8, 5, 10, 9, 7}; such as: ID number In order to: C1C2C3C4 ... C16C17 n = C17X2 C16X4 ... C1X7; 3. Remove N by 11,000 R, according to the remainder, calculate the mantissa T: 1) If r = 0, T = 1; if r = 2, t = x; 2) If r = 3, t = 9; ... prompt: string stratailchars = "10x98765432"; 4. Add the mantissa T to 17 The 18-digit number is obtained after the number.
The application of the other subString () is as follows:
If there is only one parameter in parentheses,
Return value
The character string object is the string of the character to the tail character with the position of the parameter.
Exp: string aa = '' qWERTY '';
The return value of AA.SUBSTRING (2) is: 'rty' '
If there are two parameters, you can understand this: The first parameter is
The character of the original string corresponds to the parameter, the second parameter is from the original string, and the first character calculates a total of several characters, the return value is between the two parameters corresponding characters. That string
Exp: string aa = '' qwertyuiop ''
The return value of AA.SUBSTRING (2, 8) is: 'rtyui' '
After writing, even if you are dizzy, I hope to remember it, sweat ...
