JAVA

java reverse a word

To reverse a word 

- Put all the letters in a stack and pop them out. 
Because of the LIFO order of stack, you will get the letters in 
reverse order.

reverse words in a string 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;
            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));
    }
}