Ctex listings macro package error undefined control sequence, replaced by verbatim to solve the problem

To display in ctexSource codeFirst, use the listings macro package,

\ Usepackage {listings}

......

Then

\ Begin {lstlisting}
Public static class mapclass extends mapreducebase
Implements mapper <longwritable, text, text, intwritable> {

Private Final Static intwritable one = new intwritable (1 );
Private text word = new text ();

Public void map (longwritable key, text value,
Outputcollector <text, intwritable> output,
Reporter reporter) throws ioexception {
String line = value. tostring ();
Stringtokenizer itr = new stringtokenizer (line );

}
}
\ End {lstlisting}

Next, pdflatex always prompts an error, undefined control sequence, which has not been found for a long time.

ReplaceCodePart of the Code is changed to a section of C's Hello world code.

It cannot be solved.

The final solution is to use the verbatim macro package,

Replace the above Code with \ begin {verbatim} And \ end {verbatim.

The compilation is successful.