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


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

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

Prerequisite: Regular Expression in Java





// 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;
                result = " " + temp[i] + result;
        return result;
    // Driver methods to test above method
    public static void main(String[] args)
        String s1 = "Welcome to geeksforgeeks";
        String s2 = "I love Java Programming";



geeksforgeeks to Welcome
Programming Java love I

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

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