cannot find symbol Queue Java

Question

I cannot compile below and keep getting an error like this: enter image description here

I have done the code on visual studio code and the file name is like this enter image description here

public class Main {

    public static void main(String[] args) {
        Queue<Integer> q = new LinkedList<>();

        for (int i = 0; i < 5; i++) 
            q.add(i);
        
        System.out.println("Elements of queue " + q);

        int removedele = q.remove();
        System.out.println("removed element-" + removedele);
        System.out.println(q);

        int head = q.peek();
        System.out.println("head of queue-" + head);
        System.out.println(q);

        int size = q.size();
        System.out.println("Size of queue-" + size);
        System.out.println(q);
    }
}

I copied the code from my lecturers video and in her vid, the code compiles fine. But the source code is of extension .main. I cant seem to do that here

Either rename the file to Main.java or change the class name to `call`. — Unmitigated, Aug 27 '21 at 03:23
And add the correct imports. For example: `import java.util.*`. — Unmitigated, Aug 27 '21 at 03:24
@Unmitigated I did rename to Main.java and it fixed 1/3 of the errors. It still has the other 2 errors — erasvv, Aug 27 '21 at 03:28
https://i.stack.imgur.com/Rw2n6.png This is where I got the code from, it is of extension .main but when I do .main, file doesnt open in vsc — erasvv, Aug 27 '21 at 03:31
The file extension isn't `.main`. The *package* ends in `main`. — Silvio Mayolo, Aug 27 '21 at 03:37
It seems like you have two issues going on here. First, you need to name your file Main.java to have a class named Main and you are missing imports for LinkedList. — Sam Orozco, Aug 27 '21 at 03:52
@erasvv Like I said before, you need to add the correct imports. For example: `import java.util.*;` — Unmitigated, Aug 27 '21 at 14:15

score 0 · Answer 1 · answered Aug 27 '21 at 03:39

0

add following at line at the top. import java.util.*;

answered Aug 27 '21 at 03:39

Abhishek Khedekar

11
3

score -1 · Answer 2 · answered Aug 27 '21 at 03:38

-1

You are missing the import statements for Queue and LinkedList. Java needs to know what Classes you are referring to and where they can be found.

Add this to the top of the file:

import java.util.LinkedList;
import java.util.Queue;

answered Aug 27 '21 at 03:38

Richard Stokes

385
3
11

cannot find symbol Queue Java

2 Answers2