Several methods of Java implementing string reverse output

1. The easiest estimate is to use the ToCharArray () of the string class and then reverse the method of outputting the array.

Import Javax.swing.JOptionPane;    public class ReverseString {public            static void main (string args[]) {          string originalstring;          String resultstring = "";                       originalstring = Joptionpane.showinputdialog ("Please input a String:");                    char[] Chararray = Originalstring.tochararray ();                for (int i=chararray.length-1; i>=0; i--) {              resultstring + = Chararray[i];          }                    Joptionpane.showmessagedialog (NULL, resultstring, "Reverse String", joptionpane.information_message);      }  

import Javax.swing.JOptionPane;  Public classreversestring { Public Static voidMain (String args[]) {string originalstring; String resultstring=""; Originalstring= Joptionpane.showinputdialog ("Please input a String:"); Char[] Chararray =Originalstring.tochararray ();  for(inti=chararray.length-1; i>=0; i--) {resultstring+=Chararray[i]; } joptionpane.showmessagedialog (NULL, Resultstring,"Reverse String", Joptionpane.information_message); }  }

2. You can also use the substring () method provided by the string class to output an inverted string using a recursive approach.

import Javax.swing.JOptionPane;  Public classreversestring { Public Static voidreversestring (String str) {if(str.length () = =1) {System. out. Print (str); }          Else{String subString1= Str.substring (0, Str.length ()-1); String subString2= Str.substring (Str.length ()-1); System. out. Print (SUBSTRING2);                   ReverseString (SUBSTRING1); }      }             Public Static voidMain (String args[]) {string originalstring; Originalstring= Joptionpane.showinputdialog ("Please input a String:");           ReverseString (originalstring); }  } 

import Javax.swing.JOptionPane;  Public classreversestring { Public Static voidreversestring (String str) {if(str.length () = =1) {System. out. Print (str); }          Else{String subString1= Str.substring (0, Str.length ()-1); String subString2= Str.substring (Str.length ()-1); System. out. Print (SUBSTRING2);                   ReverseString (SUBSTRING1); }      }             Public Static voidMain (String args[]) {string originalstring; Originalstring= Joptionpane.showinputdialog ("Please input a String:");           ReverseString (originalstring); }  } 

3. What's more, instead of defining strings as String classes, define them as a StringBuffer class, using the reverse () method in the StringBuffer class to reverse the string directly.

import Javax.swing.JOptionPane;  Public classreversestring { Public Static voidreversestring (String str) {StringBuffer StringBuffer=NewStringBuffer (str); System. out. Print (Stringbuffer.reverse ()); }                    Public Static voidMain (String args[]) {string originalstring; Originalstring= Joptionpane.showinputdialog ("Please input a String:");                 ReverseString (originalstring); }      } 

Several methods of Java implementing string reverse output