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Thread: How to fix error on Queue when using it with a Stack for a Palindrome?

  1. #1
    Junior Member SarahDoesIt's Avatar
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    Exclamation How to fix error on Queue when using it with a Stack for a Palindrome?

    I receive an error when trying to compile my Java code for a palindrome.

    This is my error, and I don't understand why I am receiving this error. Can someone please help me? Thank you.


    Exception in thread "main" java.lang.Error: Unresolved compilation problem:
    The type Queue is not generic; it cannot be parameterized with arguments <Character>

    at palindrome5.main(palindrome5.java:13)


    This is my code:
    import java.util.*;
     
    public class Palindrome2
    {
    public static void main(String [] args)
    {
    String input = args[0];
    // For ignoring case
    String inputString = input.toLowerCase();
    // Create stack
    Stack<Character> stack = new Stack<Character>();
    // Create queue
    Queue<Character> queue = new LinkedList<Character>();
     
     
    // Add input string to stack and queue
    for ( int i = 0 ; i < inputString.length() ; i++ )
    {
    stack.push(inputString.charAt(i));
    queue.add(inputString.charAt(i));
    }
     
    boolean palindrome = true;
     
    while ( !stack.isEmpty() && palindrome == true ) {
    if ( Character.isLetter(stack.peek()) && Character.isLetter(queue.peek()) )
    {
    // Check for comparison
    if ( stack.pop().equals( queue.remove() ) == false ) {
    palindrome = false;
    }
     
    }
    else
    {
    if ( !Character.isLetter(stack.peek()))
    stack.pop();
    if ( !Character.isLetter(queue.peek()))
    queue.remove();
     
    }
     
    }
    // Output
    System.out.println("Text: " + input );
    System.out.println("Palindrome: " + palindrome);
    }
    }


  2. #2
    Junior Member SarahDoesIt's Avatar
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    Default Re: How to fix error on Queue when using it with a Stack for a Palindrome?

    NM. I found the problem I was having. Thanks.

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