Java uses the add() function of the LinkedList class to add elements to the linked list

Java uses the add() function of the LinkedList class to add elements to the linked list

In Java development, the linked list is a commonly used data structure that can dynamically store and manage data. The Java standard library provides the LinkedList class, which facilitates us to use linked lists to store and operate data. This article will introduce in detail how to use the add() function of the LinkedList class to add elements to a linked list, with code examples.

The LinkedList class is a member of the Java collection framework. It is a doubly linked list implementation based on linked lists. Compared with the ArrayList class, the LinkedList class is characterized by higher efficiency in inserting and deleting elements, but lower efficiency in querying elements. Therefore, when elements need to be inserted and deleted frequently, we can choose to use the LinkedList class to improve performance.

First, we need to create a LinkedList object and declare its data type. For example, we can create a LinkedList object that stores integers:

LinkedList<Integer> linkedList = new LinkedList<>();

Next, we can use the add() function to add elements to the linked list. The LinkedList class provides multiple overloaded forms of the add() function, and you can choose the appropriate function according to specific needs.

For example, we can use the add() function to add an element at the end of the linked list:

linkedList.add(10);

We can also use the add() function to insert an element at a specified position in the linked list. It should be noted that the indexes in the LinkedList class start counting from 0. For example, we can insert an element at the first position of the linked list:

linkedList.add(0, 5);

In this example, we inserted element 5 at the first position of the linked list, and the element that originally existed at this position will be backwards Move one position.

In addition, we can also use the addFirst() and addLast() functions to add elements to the head and tail of the linked list. For example, we can use the addFirst() function to insert an element at the head of the linked list:

linkedList.addFirst(2);

After the linked list operation is completed, we can access and print the elements in the linked list by traversing the linked list. The LinkedList class provides the get() function to obtain elements in the linked list based on the index. For example, we can use the get() function to get the element at the first position in the linked list:

int firstElement = linkedList.get(0);
System.out.println("第一个元素是：" + firstElement);

Through the above code example, we can see how to use the add() function of the LinkedList class to add elements to the linked list. . When elements need to be inserted and deleted frequently, using the LinkedList class can provide higher efficiency. However, if you need to query elements frequently, you should consider using the ArrayList class.

To summarize, the LinkedList class is a member of the Java collection framework and can be used to store and manage data. Use the add() function to add elements to the linked list, and select the appropriate overloaded form as needed. By traversing the linked list, we can access and print the elements in the linked list.

I hope this article will help you understand how to use the add() function of the LinkedList class in Java to add elements to a linked list. I wish you better results in Java programming!

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