In coding interviews, you may encounter problems that involve working with linked lists. Linked list problems can range from finding the length of a linked list to merging two sorted linked lists.

Here are some common problems related to linked lists:

• Finding the length of a linked list: To find the length of a linked list, you can iterate through the list and count the number of nodes.

• Reversing a linked list: To reverse a linked list, you need to update the 'next' pointers of each node to point to the previous node. You can use three pointers - 'prev', 'current', and 'next' - to keep track of the nodes during the reversal process.

• Merging two sorted linked lists: To merge two sorted linked lists, you can compare the values of the nodes in the two lists and create a new list with the merged values in a sorted order.

Here's some Java code that demonstrates these operations on linked lists:

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import java.util.*;

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public class LinkedListProblems {

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    // Function to find the length of a linked list

    public static int findLength(ListNode head) {

        int length = 0;

        ListNode current = head;

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        while (current != null) {

            length++;

            current = current.next;

        }

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        return length;

    }

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    // Function to reverse a linked list

    public static ListNode reverseList(ListNode head) {

        ListNode prev = null;

        ListNode current = head;

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        while (current != null) {

            ListNode next = current.next;

            current.next = prev;

            prev = current;

            current = next;

        }

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