A summary of common methods for realizing the reverse output of strings in Java _java

This article summarizes the Java implementation of the reverse string output of the common methods, shared for everyone to reference. The specific methods are as follows:

1. The most readily conceivable estimate is the use of ToCharArray () of the String class, and the method of outputting the array in reverse.

The implementation code is as follows:

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); 
  } 
 

2. The substring () method provided by the string class can also be used to output the reverse string in a recursive way.

The implementation code is as follows:

Import Javax.swing.JOptionPane; 
public class ReverseString {public 
  static void reversestring (String str) { 
    if (str.length () = 1) { 
      System.ou T.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 void Main (string args[]) { 
    string originalstring; 
     
    originalstring = Joptionpane.showinputdialog ("Please input a String:"); 
     
    ReverseString (originalstring);    
  } 
 

3. There is also a string that is not defined as a class, but is defined as a StringBuffer class, using the reverse () method in the StringBuffer class to directly reverse the string.

The implementation code is as follows:

Import Javax.swing.JOptionPane; 
public class ReverseString {public 
  static void reversestring (String str) { 
    StringBuffer stringbuffer = new String Buffer (str); 
     
    System.out.print (Stringbuffer.reverse ()); 
  } 
   
  public static void Main (string args[]) { 
    string originalstring; 
     
    originalstring = Joptionpane.showinputdialog ("Please input a String:"); 
     
    ReverseString (originalstring);     
  } 

I hope this article will help you with your study of Java programming.