In this example we shall show you how to remove the first and the last element of a LinkedList. To remove the first and the last element of a LinkedList one should perform the following steps:
- Create a new LinkedList.
- Populate the list with elements, with the
add(E e)API method of the LinkedLink. - Invoke the
removeFirst()API method of the LinkedList. It removes and returns the first element of the list. Subsequent elements are shifted the to the left. - Invoke the
removeLast()API method of the LinkedList. It removes and returns
the last element of the list,
as described in the code snippet below.
package com.javacodegeeks.snippets.core;
import java.util.LinkedList;
public class RemoveFirstLastElementLinkedList {
public static void main(String[] args) {
// Create a LinkedList and populate it with elements
LinkedList linkedList = new LinkedList();
linkedList.add("element_1");
linkedList.add("element_2");
linkedList.add("element_3");
linkedList.add("element_4");
linkedList.add("element_5");
System.out.println("LinkedList contains : " + linkedList);
/*
* Object removeFirst() operation removes and returns the first
* element of LinkedList. Subsequent elements are shifted the to
* the left
*/
Object firstElement = linkedList.removeFirst();
System.out.println(firstElement + " has been removed from LinkedList");
System.out.println("LinkedList contains : " + linkedList);
/*
* Object removeLast() operation removes and returns the last element
* of LinkedList
*/
Object lastElement = linkedList.removeLast();
System.out.println(lastElement + " has been removed from LinkedList");
System.out.println("LinkedList contains : " + linkedList);
}
}
Output:
LinkedList contains : [element_1, element_2, element_3, element_4, element_5]
element_1 has been removed from LinkedList
LinkedList contains : [element_2, element_3, element_4, element_5]
element_5 has been removed from LinkedList
LinkedList contains : [element_2, element_3, element_4]
This was an example of how to remove the first and the last element of a LinkedList in Java.
