Errors in data structures related to stack.

Question

1.00/5 (1 vote)

See more:

Can anybody tell me what error I have here. Bluej is showing compilation error.

What I have tried:

Java

import java.util.*;
class Queue
{
    public static void main(String[] args)
    {
        Queue a=new LinkedList();
        a.add(8);
        a.add(8);
        a.add(9);

        System.out.println(a);
        System.out.println(a.remove());
    }
}

Posted 20-Sep-20 23:05pm

Comder

Updated 20-Sep-20 23:30pm

CPallini

v2

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

CPallini · Answer 1 · 2020-09-20T23:30:00

Solution 2

If your Queue class needs, internally a linked list, then you might write something like

Java

import java.util.*;
class Queue
{
  LinkedList<Integer> m_llist;

  public Queue()
  {
    m_llist = new LinkedList<>();
  }

  public void add(int i)
  {
    m_llist.add(i);
  }

  public static void main(String[] args)
  {
    Queue q = new Queue();
    q.add(8);
    q.add(8);
    q.add(9);
  }
}

Posted 20-Sep-20 23:30pm

CPallini

Comments

Comder 21-Sep-20 6:15am

I don't want linkedlist. I want only queue. My bluej is showing errors in add and remove.

import java.util.*;
class Queue
{
public static void main(String[] args)
{
Queue a=new Queue();
a.add(8);
a.add(8);
a.add(9);

System.out.println(a);
System.out.println(a.remove());
}
}

Help me. Correct it and resend me.

CPallini 21-Sep-20 6:19am

You have to implement both the Queue constructor and the add method (moreover you have to store, in the container you like, the Integers received by the add method).

Comder 21-Sep-20 6:23am

Show me edited source code.

[no name] 21-Sep-20 9:44am

+5 for a detailed implementation.

Richard MacCutchan · Answer 2 · 2020-09-20T23:16:00

Solution 1

Java

Queue a=new LinkedList();

You cannot assign a LinkedList to an object of type Queue. There is no relationship between them.

Posted 20-Sep-20 23:16pm

Richard MacCutchan

Comments

CPallini 21-Sep-20 5:28am

5.