Java Collection: LinkedList

It's a doubly-linked list implementation of the List and Deque interfaces.

The important facts about LinkedList class are:

1. It can contain duplicate elements.
2. Elements are stored according to the insertion order.
3. It is not synchronized.

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Hierarchy of ArrayList class

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It inherits AbstractSequentialList class and implements Serializable, Cloneable, Iterable, Collection, Deque, List, and Queue interfaces.

Source code of Item.java

package com.t4b.test; public class Item { String name; int id; double price; public Item(String name, int id, double price) { super(); this.name = name; this.id = id; this.price = price; } @Override public String toString() { return "Item [name=" + name + ", id=" + id + ", price=" + price + "]"; } }

Source code of TestMain.java

package com.t4b.test; import java.util.LinkedList; public class TestMain { public static void main(String[] args) { LinkedList<Item> items = new LinkedList<Item>(); items.add(new Item("Apple", 1, 150.0)); items.add(new Item("Grape", 2, 250.0)); items.addFirst(new Item("Mango", 3, 10)); items.addLast(new Item("Pine Apple", 4, 100)); for (Item i : items) System.out.println(i); System.out.println(items.size()); } }

Happy Exploring!