Reverse words in a given String in Java

Let’s see an approach to reverse words of a given String in Java without using any of the String library function

Examples:

Input : "Welcome to geeksforgeeks"
Output : "geeksforgeeks to Welcome"

Input : "I love Java Programming"
Output :"Programming Java love I"

Prerequisite: Regular Expression in Java

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java Program to reverse a String
// without using inbuilt String function
import java.util.regex.Pattern;
public class Exp {
  
    // Method to reverse words of a String
    static String reverseWords(String str)
    {
  
        // Specifying the pattern to be searched
        Pattern pattern = Pattern.compile("\\s");
  
        // splitting String str with a pattern
        // (i.e )splitting the string whenever their
        //  is whitespace and store in temp array.
        String[] temp = pattern.split(str);
        String result = "";
  
        // Iterate over the temp array and store
        // the string in reverse order.
        for (int i = 0; i < temp.length; i++) {
            if (i == temp.length - 1)
                result = temp[i] + result;
            else
                result = " " + temp[i] + result;
        }
        return result;
    }
  
    // Driver methods to test above method
    public static void main(String[] args)
    {
        String s1 = "Welcome to geeksforgeeks";
        System.out.println(reverseWords(s1));
  
        String s2 = "I love Java Programming";
        System.out.println(reverseWords(s2));
    }
}

chevron_right






                        filter_none








Output:


geeksforgeeks to Welcome
Programming Java love I



You can find the c++ solution for Reverse words in a String here


This article is contributed by Sumit Ghosh. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.


Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.



          
          
          
          

            

    

        My Personal Notes
        arrow_drop_up
    

    

        
        

            
            
        

    


Recommended Posts: