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Error Detection Based on Check Digit Schemes

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4.72/5 (27 votes)
27 Nov 2007CPOL12 min read 90.7K   2.9K   50  
A Survey of Popular Check Digit Schemes
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CheckISO7064Mod11_2
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com.modp.checkdigits</FONT>
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Class CheckISO7064Mod11_2</H2>
<PRE>
java.lang.Object
  <IMG SRC="../../../resources/inherit.gif" ALT="extended by"><B>com.modp.checkdigits.CheckISO7064Mod11_2</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../com/modp/checkdigits/CheckDigit.html" title="interface in com.modp.checkdigits">CheckDigit</A></DD>
</DL>
<HR>
<DL>
<DT>public class <B>CheckISO7064Mod11_2</B><DT>extends java.lang.Object<DT>implements <A HREF="../../../com/modp/checkdigits/CheckDigit.html" title="interface in com.modp.checkdigits">CheckDigit</A></DL>

<P>
Implements ISO 7064 Mod 11,2 check digit scheme.
<P>

<P>
<DL>
<DT><B>Version:</B></DT>
  <DD>1</DD>
<DT><B>Author:</B></DT>
  <DD>nickg</DD>
</DL>
<HR>

<P>
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<TD><CODE><B><A HREF="../../../com/modp/checkdigits/CheckISO7064Mod11_2.html#CheckISO7064Mod11_2()">CheckISO7064Mod11_2</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
</TR>
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<CODE>&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/modp/checkdigits/CheckISO7064Mod11_2.html#computeCheck(java.lang.String)">computeCheck</A></B>(java.lang.String&nbsp;digits)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Computes the check digit value</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/modp/checkdigits/CheckISO7064Mod11_2.html#encode(java.lang.String)">encode</A></B>(java.lang.String&nbsp;digits)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Add check digits to a string containing digits</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/modp/checkdigits/CheckISO7064Mod11_2.html#getCheckDigit(java.lang.String)">getCheckDigit</A></B>(java.lang.String&nbsp;digits)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Extract just the check digits from an encoded string</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/modp/checkdigits/CheckISO7064Mod11_2.html#getData(java.lang.String)">getData</A></B>(java.lang.String&nbsp;digits)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Extracts the raw data without the check digits</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/modp/checkdigits/CheckISO7064Mod11_2.html#verify(java.lang.String)">verify</A></B>(java.lang.String&nbsp;digits)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Verify a string that has been encoded with a check digit</TD>
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<TD><B>Methods inherited from class java.lang.Object</B></TD>
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<TD><CODE>equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<A NAME="CheckISO7064Mod11_2()"><!-- --></A><H3>
CheckISO7064Mod11_2</H3>
<PRE>
public <B>CheckISO7064Mod11_2</B>()</PRE>
<DL>
</DL>

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<A NAME="encode(java.lang.String)"><!-- --></A><H3>
encode</H3>
<PRE>
public java.lang.String <B>encode</B>(java.lang.String&nbsp;digits)</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../com/modp/checkdigits/CheckDigit.html" title="interface in com.modp.checkdigits">CheckDigit</A></CODE></B></DD>
<DD>Add check digits to a string containing digits
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../com/modp/checkdigits/CheckDigit.html#encode(java.lang.String)">encode</A></CODE> in interface <CODE><A HREF="../../../com/modp/checkdigits/CheckDigit.html" title="interface in com.modp.checkdigits">CheckDigit</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>digits</CODE> - the input data string containing only digits '0'-'9'
<DT><B>Returns:</B><DD>a new string containing data and check digits</DL>
</DD>
</DL>
<HR>

<A NAME="verify(java.lang.String)"><!-- --></A><H3>
verify</H3>
<PRE>
public boolean <B>verify</B>(java.lang.String&nbsp;digits)</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../com/modp/checkdigits/CheckDigit.html" title="interface in com.modp.checkdigits">CheckDigit</A></CODE></B></DD>
<DD>Verify a string that has been encoded with a check digit
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../com/modp/checkdigits/CheckDigit.html#verify(java.lang.String)">verify</A></CODE> in interface <CODE><A HREF="../../../com/modp/checkdigits/CheckDigit.html" title="interface in com.modp.checkdigits">CheckDigit</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>digits</CODE> - input digits
<DT><B>Returns:</B><DD>true if valid, false otherwise</DL>
</DD>
</DL>
<HR>

<A NAME="computeCheck(java.lang.String)"><!-- --></A><H3>
computeCheck</H3>
<PRE>
public int <B>computeCheck</B>(java.lang.String&nbsp;digits)</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../com/modp/checkdigits/CheckDigit.html" title="interface in com.modp.checkdigits">CheckDigit</A></CODE></B></DD>
<DD>Computes the check digit value
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../com/modp/checkdigits/CheckDigit.html#computeCheck(java.lang.String)">computeCheck</A></CODE> in interface <CODE><A HREF="../../../com/modp/checkdigits/CheckDigit.html" title="interface in com.modp.checkdigits">CheckDigit</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>digits</CODE> - - a string containing data
<DT><B>Returns:</B><DD>an integer representing the check digit</DL>
</DD>
</DL>
<HR>

<A NAME="getCheckDigit(java.lang.String)"><!-- --></A><H3>
getCheckDigit</H3>
<PRE>
public int <B>getCheckDigit</B>(java.lang.String&nbsp;digits)</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../com/modp/checkdigits/CheckDigit.html" title="interface in com.modp.checkdigits">CheckDigit</A></CODE></B></DD>
<DD>Extract just the check digits from an encoded string
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../com/modp/checkdigits/CheckDigit.html#getCheckDigit(java.lang.String)">getCheckDigit</A></CODE> in interface <CODE><A HREF="../../../com/modp/checkdigits/CheckDigit.html" title="interface in com.modp.checkdigits">CheckDigit</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>digits</CODE> - input data containing check and data digits
<DT><B>Returns:</B><DD>the check digit, as an int.</DL>
</DD>
</DL>
<HR>

<A NAME="getData(java.lang.String)"><!-- --></A><H3>
getData</H3>
<PRE>
public java.lang.String <B>getData</B>(java.lang.String&nbsp;digits)</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../com/modp/checkdigits/CheckDigit.html" title="interface in com.modp.checkdigits">CheckDigit</A></CODE></B></DD>
<DD>Extracts the raw data without the check digits
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../com/modp/checkdigits/CheckDigit.html#getData(java.lang.String)">getData</A></CODE> in interface <CODE><A HREF="../../../com/modp/checkdigits/CheckDigit.html" title="interface in com.modp.checkdigits">CheckDigit</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>digits</CODE> - -- A string containing only digits 0-9
<DT><B>Returns:</B><DD>a string without check digits</DL>
</DD>
</DL>
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