In this tutorial, we will see how to get an element from the LinkedList. LinkedList class provides various methods to get an element from the LinkedList. Let’s see this method as an example.
Introduction
The LinkedList class is present in the java.util package.
LinkedList internally uses a doubly Linkedlist for storing the variables. That’s why LinkedList is preferred when our frequent operation is insertion and deletion.
LinkedList class provides the following method to an element from the list.
get(int index)getFirst()getLast()
1. get(int index)
The get(int index) method returns the element at the specified position (index) in this list.
The method signature is given below.
public E get(int index)
This method accepts a parameter index of type int, an index of the element that needs to be returned.
I have given a Java program below to get an element from the LinkedList using the get(int index) method.
import java.util.LinkedList;
/**
* A Java program to get an element from
* the LinkedList by its index.
*
* @author coderolls.com
*/
public class LinkedListGetElement {
public static void main(String[] args) {
LinkedList<String> linkedList = new LinkedList<String>();
linkedList.add("Adidas");
linkedList.add("Air");
linkedList.add("Nike");
linkedList.add("Puma");
linkedList.add("Reebok");
System.out.println("LinkedList: ");
System.out.println(linkedList);
// get element at index 3
String element = linkedList.get(3); // Puma
System.out.println("\nElement at index 3 is "+ element);
}
}
Output:
LinkedList:
[Adidas, Air, Nike, Puma, Reebok]
Element at index 3 is Puma
2. getFirst()
This method returns the first element in this list.
The method signature is given below.
public E getFirst()
This method does not accept a parameter.
I have given a Java program to get an element from the LinkedList using the getFirst() method.
import java.util.LinkedList;
/**
* A Java program to get the first element from
* the linkedlist using getFirst() method.
*
* @author coderolls.com
*/
public class LinkedListGetFirst {
public static void main(String[] args) {
LinkedList<String> linkedList = new LinkedList<String>();
linkedList.add("Adidas");
linkedList.add("Air");
linkedList.add("Nike");
linkedList.add("Puma");
linkedList.add("Reebok");
System.out.println("LinkedList: ");
System.out.println(linkedList);
//Get the first element
String element = linkedList.getFirst(); // Adidas
System.out.println("\nFirst element of the linkedList is: "+ element);
}
}
Output:
LinkedList:
[Adidas, Air, Nike, Puma, Reebok]
The first element of the linkedList is: Adidas
3. getLast()
This method returns the last element in this list.
The method signature is given below.
public E getLast()
This method does not accept a parameter.
I have given a Java program to get an element from the LinkedList using the getFirst() method.
import java.util.LinkedList;
/**
* A Java program to get the last element of
* the linkedlist using getLast() method.
*
* @author coderolls.com
*/
public class LinkedListGetLast {
public static void main(String[] args) {
LinkedList<String> linkedList = new LinkedList<String>();
linkedList.add("Adidas");
linkedList.add("Air");
linkedList.add("Nike");
linkedList.add("Puma");
linkedList.add("Reebok");
System.out.println("LinkedList: ");
System.out.println(linkedList);
//Get the first element
String element = linkedList.getLast(); // Adidas
System.out.println("\nThe last element of the linkedList is: "+ element);
}
}
Output:
LinkedList:
[Adidas, Air, Nike, Puma, Reebok]
The last element of the linkedList is: Reebok
Conclusion
The LinkedList class provides the following method to get an element from the LinkedList.
-
get(int index)//Get an element at index 3 String element = linkedList.get(3); -
getFirst()//Get the first element String element = linkedList.getFirst(); -
getLast()//Get the last element String element = linkedList.getLast();
The example Java programs given in the above tutorial can be found at this GitHub Repository.
Let me know your thoughts or suggestions on the topic discussed above in the comment section below.