ReverseWords.java

package Stack;

public class ReverseWords {

    static void reverseWords(String str)
    {
        Stack<Character> st = new Stack<Character>();
 
        // Traverse given string and push all
        // characters to stack until we see a space.
        for (int i = 0; i < str.length(); ++i) {
            if (str.charAt(i) != ' ')
                st.push(str.charAt(i));
 
            // When we see a space, we print
            // contents of stack.
            else {
                while (st.empty() == false) {
                    System.out.print(st.pop());
                }
                System.out.print(" ");
            }
        }
 
        // Since there may not be space after
        // last word.
        while (st.empty() == false) {
            System.out.print(st.pop());
        }
    }
    public static void main(String[] args) {
        String str = "Geeks for Geeks";
        reverseWords(str);
    }
}