I’m working on a Java project where I’m using an ArrayList to store user data. However, I’m encountering a NullPointerException when I try to access an element. Here is the relevant code:

import java.util.ArrayList;

public class UserList {
private ArrayList users;

public UserList() {
    // Intentionally left users uninitialized to demonstrate the problem
}

public void addUser(String user) {
    users.add(user);
}

public String getUser(int index) {
    return users.get(index);
}

public static void main(String[] args) {
    UserList userList = new UserList();
    userList.addUser("Ashini");
    System.out.println(userList.getUser(0));
}

}

I expected to see “Ashini” printed, but I get a NullPointerException instead. I understand this might be due to users being null, but I’m not sure how to properly initialize it. How can I fix this issue?