Question

I’m getting an error when trying to create the linked list that says:

Exception in thread “main” java.lang.Error: Unresolved compilation problem:

The type LinkedList is not generic; it cannot be parameterized with arguments <String>

at LinkedList.main(LinkedList.java:7)

Anyone know how to fix this error? Here is the program:

import java.util.*;

public class LinkedList {
    public static void main(String[] args) {
        List<String> list = new LinkedList<String>();
        Scanner input = new Scanner(System.in);

        System.out.print("How many elements do you want to add: ");
        int num = input.nextInt();

        for(int i = 0; i < num; i++) {
            System.out.print("Add Element: ");
            String element = input.next();
            list.add(element);
        }
        System.out.println();

        System.out.println("LinkedList elements are: ");
        for(int i = 0; i < list.size(); i++) {
            System.out.println(list.get(i));
        }
    }
}

Answer 1

Change

new LinkedList<String>()

to

new java.util.LinkedList<String>()

The source of the problem is that LinkedList refers to the class containing the code class LinkedList, not java.util.LinkedList.

Unqualified class names like LinkedList (in contrast to “fully-qualified names” like java.util.LinkedList) are resolved by looking for a match in a certain order. Roughly

1. Look for a containing class.
2. Look for a non-wildcard import.
3. Look for a class in the same package.
4. Look for a wildcard import.

Section “6.5 Determining the Meaning of a Name” of the Java language specification explains in more detail.