What is the LinkedList.add method in Java?
What is the add method?
The add method of the LinkedList class adds an element to the end of the LinkedList.
LinkedList
A LinkedList is a collection of linear data elements. Each element, or node, contains data and reference parts.
- The data part has the value
- The reference part has the address link to the next element
The elements are not indexed so random access, such as Array, is not possible. Instead, we traverse from the beginning of the list and access the elements.
In Java, the
LinkedListis a doubly-linked list implementation of the List and Deque interfaces.
The LinkedList class present in the java.util package.
Syntax
public boolean add(E e);
Parameters
The add method takes the element to be added to the list as a parameter.
Return value
The add method returns true if the element is added to the list.
Code
The code below demonstrates how to use the add method.
import java.util.LinkedList;class LinkedListAdd {public static void main( String args[] ) {LinkedList<String> list = new LinkedList<>();list.add("hello");System.out.println("The list is " + list);list.add("hi");System.out.println("The list is " + list);}}
Explanation
In the code above,
- In line number 1 we import the
LinkedListclass.
import java.util.LinkedList;
- In line number 4 we create a
LinkedListobject with the namelist.
LinkedList<String> list = new LinkedList<>();
- In line number 5 we use the
addmethod of thelistobject to add an element ("hello") to the list. - Then we print the list.
list.add("hello");
list; // ["hello"]
- In line number 7 we use the
addmethod of thelistobject to add another element ("hi") to the list. - Then we print the list.
list.add("hi");
list; // ["hello", "hi"]
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