Java tutorial
import java.util.Stack; public class Main { public static void main(String[] args) { String input = "This is a sentence"; char[] charinput = input.toCharArray(); Stack<String> stack = new Stack<String>(); for (int i = input.length() - 1; i >= 0; i--) { stack.push(String.valueOf(charinput[i])); } StringBuilder StackPush = new StringBuilder(); for (int i = 0; i < stack.size(); i++) { StackPush.append(stack.get(i)); } System.out.println(StackPush.toString()); } }