In java, the specified part of the string is reversed, and in java, the string is reversed.

In java, the specified part of the string is reversed, and in java, the string is reversed.

This blog post adopts java implementation: rotate the specified part of the string, for example, str = "mmabcdfeffnn". If you specify abcdfeff to rotate the part, str = "mmffefdcbann" is obtained ".

The implementation idea is as follows: the source string is divided into three parts: the header, to be rotated, and the tail. All three parts need to be intercepted, for the part to be rotated, a technique is used here, that is, StringBuffer (String string) is used as the intermediary and the reverse () method is called to rotate. The last three parts are as follows: Header, rotated, and tail. Connect to concat (String string.

The Code is as follows:

 

/*** Reverse the specified part of the String * @ author zhonglinsen * 2016-3-1 pm */public class StringReverse {public static void main (String [] args) {String str = "mmabcdefnn"; int start = 2; int end = 7; System. out. println ("original String:" + str); String strNew = strReverse (str, start, end); System. out. println ("the String after the specified position is rotated:" + strNew);} public static String strReverse (String strArg, int start, int end) {String strStart = strArg. substring (0, start); String strEnd = strArg. substring (end + 1, strArg. length (); String strSub = strArg. substring (start, end + 1); StringBuffer sb = new StringBuffer (strSub); strSub = sb. reverse (). toString (); return strStart. concat (strSub ). concat (strEnd );}}