The get the first element we can use the LinkedList.getFirst() method and to get the last element we can use the LinkedList.getLast() method.

package org.kodejava.util;

import java.util.LinkedList;

public class LinkedListGetFirstLast {
    public static void main(String[] args) {
        LinkedList<String> names = new LinkedList<>();
        names.add("Alice");
        names.add("Bob");
        names.add("Carol");
        names.add("Mallory");

        // Get the first and the last element of the linked list
        String first = names.getFirst();
        String last = names.getLast();

        System.out.println("First member = " + first);
        System.out.println("Last member  = " + last);
    }
}

The program will print the following result:

First member = Alice
Last member  = Mallory

This program shows you how to use the remove(int index) method of LinkedList class to remove an item at specified index from linked list object.

package org.kodejava.util;

import java.util.LinkedList;

public class LinkedListRemove {
    public static void main(String[] args) {
        LinkedList<String> names = new LinkedList<>();
        names.add("Alice");
        names.add("Bob");
        names.add("Carol");
        names.add("Mallory");

        System.out.println("Original values are:");
        System.out.println("====================");
        for (String name : names) {
            System.out.println("Name = " + name);
        }

        // Remove Carol from the linked list.
        names.remove(2);

        System.out.println("New values are:");
        System.out.println("====================");
        for (String name : names) {
            System.out.println("Name = " + name);
        }
    }
}

The result of the program above are:

Original values are:
====================
Name = Alice
Name = Bob
Name = Carol
Name = Mallory
New values are:
====================
Name = Alice
Name = Bob
Name = Mallory

To insert an item at any position into a linked list object we can use the add(int index, Object o) method. This method takes the index to where the new object to be inserted and the object to be inserted itself.

package org.kodejava.util;

import java.util.LinkedList;

public class LinkedListAddDemo {
    public static void main(String[] args) {
        LinkedList<String> names = new LinkedList<>();
        names.add("Alice");
        names.add("Bob");
        names.add("Mallory");

        System.out.println("Original values are:");
        System.out.println("====================");
        for (String name : names) {
            System.out.println("Name = " + name);
        }

        // Add a new item to the list at index number 2. Because
        // a list are 0 based index Carol will be inserted after
        // Bob.
        names.add(2, "Carol");

        System.out.println("New values are:");
        System.out.println("====================");
        for (String name : names) {
            System.out.println("Name = " + name);
        }
    }
}

The result of our program are:

Original values are:
====================
Name = Alice
Name = Bob
Name = Mallory
New values are:
====================
Name = Alice
Name = Bob
Name = Carol
Name = Mallory

To add an item before the first item in the linked list we use the LinkedList.addFisrt() method and to add an items after the last item in the linked list we use the LinkedList.addLast() method.

package org.kodejava.util;

import java.util.LinkedList;

public class LinkedListAddItems {
    public static void main(String[] args) {
        LinkedList<String> grades = new LinkedList<>();
        grades.add("B");
        grades.add("C");
        grades.add("D");
        grades.add("E");

        System.out.println("Original values are:");
        System.out.println("====================");
        for (String grade : grades) {
            System.out.println("Grade = " + grade);
        }

        grades.addFirst("A");
        grades.addLast("F");

        System.out.println("New values are:");
        System.out.println("====================");
        for (String grade : grades) {
            System.out.println("Grade = " + grade);
        }
    }
}

The result of the program are the following:

Original values are:
====================
Grade = B
Grade = C
Grade = D
Grade = E
New values are:
====================
Grade = A
Grade = B
Grade = C
Grade = D
Grade = E
Grade = F