String space removal and reverse operation example

1. Remove spaces from strings

Package Tan; public class copyofstringtest {public static void main (string [] ARGs) {string S = "Tan at Guigu"; Sop (s); string x = mytrim (s ); sop (x);} public static void Sop (string Str) {system. out. println (STR);} // 1. Remove spaces at both ends of the string. Public static string mytrim (string Str) {int start = 0, end = Str. length ()-1; while (start <= end & Str. charat (start) = '') {start ++;} while (start <= end & Str. charat (end) = '') {end --;} return Str. substring (START, end + 1 );}}

2. Reverse the string

Package Tan; public class stringtest {public static void main (string [] ARGs) {string S = "abcdefgh"; Sop (reversestring (S, 0, 2 )); // indicates reverse Sop (reversestring (s) between 0 and 1;} public static void Sop (string Str) {system. out. println (STR);} // Exercise 2: reverse the string. /** Train of thought: 1. Convert the string into an array. 2. Reverse the array. 3. Convert the array into a string. * // *** Function: [partial inversion] invert the characters between specified badge values * @ Param S * @ Param start * @ Param end * @ return */public static string reversestring (string S, int start, int end) {// string variable array. Char [] CHS = S. tochararray (); // reverse the array. Reverse (CHS, start, end); // convert the array into a string. Return new string (CHS);}/*** function: [reverse all] Reverse the entire string * @ Param S * @ return */public static string reversestring (string S) {return reversestring (S, 0, S. length ();} // end = Y-1; contains the header that does not contain the end. Private Static void reverse (char [] arr, int X, int y) {for (INT start = x, end = Y-1; Start <end; Start ++, end --) {swap (ARR, start, end) ;}} Private Static void swap (char [] arr, int X, int y) {char temp = arr [x]; arr [x] = arr [y]; arr [y] = temp ;}}