Static Nested Classes
Define static nested classes as associated helper types without an enclosing instance reference.
Static Nested Classes
A static nested class is defined inside another class with the static keyword. It has no reference to the enclosing class instance — it is just logically grouped with it.
Declaring a Static Nested Class
Use the outer class name to access the nested class from outside.
class LinkedList<T> {
private Node<T> head;
// Static nested class — no outer instance reference
private static class Node<T> {
T data;
Node<T> next;
Node(T data) { this.data = data; }
}
public void addFirst(T item) {
Node<T> node = new Node<>(item);
node.next = head;
head = node;
}
}