Gets a substring with an inverted string of the maximum length

/*******************************************************************************


* @Description string operation class


* @Author CManLH@163.com


* @Date 2008/05/24


　　 ******************************************************************************/


public class Stringx {


　　　　/*


* @Function obtains the maximum length from the specified string a substring of the inverted string


* @Parm str string source string


* @Return has the largest substring of the inverted string, and when there are multiple, only the rightmost one is returned


　　　　 */


public string getmaxlenreversestring (String str) {


int startIndex =-1;


int lenofreversestr = 2;


int tmp =-1;


for (int i = Lenofreversestr i <= str.length (); i++) {


tmp = getposofreversestring (str, i);


if (TMP!=-1) {


lenofreversestr = i;


StartIndex = tmp;


str = str.substring (0, tmp + LENOFREVERSESTR);


} else {


break;


　　　　　　　　}


　　　　　　}


return StartIndex = = 1? Str.substring (0,1): str.substring (Startindex,startindex + lenofreversestr);


　　　　}


　　　　/*


* @Function from the specified string, gets the starting position of the substring with its reverse string at the rightmost specific length


* @Parm str string source string from which to get the substring of the inverted string


* @Parm Lenofreversestr int Reverses the length of the string


* @Return Int has the starting position of the substring of the inverted string. Returns-1
if no substring inversion string or parameter error exists

　　　　 */


public int getposofreversestring (String str, int lenofreversestr) {


if (Lenofreversestr > str.length () | | Lenofreversestr < 1) {


return-1;


　　　　　　}


for (int i = Str.length ()-lenofreversestr i >= 0; i--) {


if (Str.indexof (getreversestring (STR,I,LENOFREVERSESTR))!=-1) {


return i;


　　　　　　　　}


　　　　　　}


return-1;


　　　　}


　　　　/*


* @Function to get the inverted string of its substring from the specified string


* @Parm str string source string from which to get the inverted string


* @Parm s int will be reversed to the starting position of the substring in the source string


* @Parm Len Int will be reversed by the length of the substring


* @Return String that was reversed after string. Returns an empty string, such as a parameter error


　　　　 */


Public String getreversestring (string str, int s, int len) {


int tmp = s + len;


if (tmp > str.length () | | tmp < 1 | | s * Len < 0) {


return "";


　　　　　　}


StringBuilder reversestr = new StringBuilder (len);


for (int i = s + len-1; I >= s; i--) {


Reversestr.append (Str.charat (i));


　　　　　　}


return reversestr.tostring ();


　　　　}


public static void Main (string[] args) {


stringx objtest = new Stringx ();


System.out.println (objtest.getmaxlenreversestring ("Arstuvywfdevutsrz"));


System.out.println (objtest.getmaxlenreversestring ("ABC"));


System.out.println (objtest.getmaxlenreversestring ("Defdedjh"));


System.out.println (objtest.getmaxlenreversestring ("Hijklkjih"));


　　　　}


　　}