Question

Write a java program to reverse element of a stack. For any given word (from input), insert every character (from the word) into a stack. The output from the stack should be the same as the input. Your program should be using a stack and a queue to complete this process. 1. Push into stack 2. Pop from stack 3. Enqueue into queue 4. Dequeue from queue 5. Push into stack 6. Pop from stack and display java

Answer 1

Code

import java.util.*;

public class Main {

   public static void main(String[] args) {
       String word;
       char c;
       Scanner scnr=new Scanner(System.in);
       Stack<Character> stack=new Stack<>();
       Queue<Character> queue=new LinkedList<>();
       System.out.print("Enter word: ");
       word=scnr.nextLine();
      
       //push all the character from word to Stack
       for(int i=0;i<word.length();i++)
           stack.push(word.charAt(i));
      
       //now one by one pop the character and add that character to the queue
       while(!stack.isEmpty())
       {
           c=stack.pop();
           queue.add(c);
       }
       //now dequeue char from the queue and add to the stack
       while(!queue.isEmpty())
       {
           c=queue.poll();
           stack.push(c);
       }
       //now pop char frommthe stack and print
       while(!stack.isEmpty())
       {
           c=stack.pop();
           System.out.print(c);
       }
       System.out.println();
   }

}

output

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