What data type is usually used to create a linked list?

To create a linked list in Java, a class or data structure that contains two fields is usually used:

• The value (data) of the node — for example, an object or a primitive type.
• A reference to the next node (next).

The data type for the node is often implemented as a nested class or a separate class with fields, for example:

class Node {
    int data;      // or another data type
    Node next;     // reference to the next element

    Node(int data) {
        this.data = data;
        this.next = null;
    }
}

Thus, to create a linked list, a custom class (Node) is used, where each element contains data and a reference to the next element of the list.