question: public static String intToString ( int value , int nChars ) { String strValue = Integer . toString ( value ) ; StringBuilder strBuf = new StringBuilder ( nChars ) ; for ( int i = strValue . length ( ) ; i < nChars ; i ++ ) { strBuf . append ( '0' ) ; } strBuf . append ( strValue ) ; return strBuf . toString ( ) ; }
target:  Method intToString. Converst an integer to nChars characters