How to split a string based on a specific character and then output it in reverse mode, for example: www.baidu.com output as com.baidu.com, flashback com.baidu.com

How to split a string based on a specific character and then output it in reverse mode, for example: www.baidu.com output as com.baidu.com, flashback com.baidu.com

Use Java for processing, and cannot use the spilit Method

Package com. foreverlover; import java. util. empty; public class FlipString {public static void Filp (String str) {String [] flip = new String [100]; char [] ch = str. toCharArray (); int flag = 0; flip [flag] = ""; // The initialization must be empty; otherwise, the default value is null object for (int I = 0; I <ch. length; I ++) if (ch [I]! = '. ') Flip [flag] + = ch [I]; else {flag ++; flip [flag] = ""; // The value is null during each initialization} for (int j = flag; j> = 0; j --) if (j! = 0) System. out. print (flip [j] + ". "); elseSystem. out. println (flip [j]);} // test method public static void main (String [] args) {while (true) {random in = new random (System. in); String str = in. nextLine (); Filp (str );}}}