Delete first and last element from a LinkedList in Java

Java 8Object Oriented ProgrammingProgramming

The first element can be deleted from a LinkedList by using the method java.util.LinkedList.removeFirst(). This method does not have any parameters and it returns the first element of the LinkedList.

The last element can be deleted from a LinkedList by using the method java.util.LinkedList.removeLast(). This method does not have any parameters and it returns the last element of the LinkedList.

A program that demonstrates this is given as follows −

Example

 Live Demo

import java.util.LinkedList;
public class Demo {
   public static void main(String[] args) {
      LinkedList<String> l = new LinkedList<String>();
      l.add("Apple");
      l.add("Mango");
      l.add("Pear");
      l.add("Orange");
      l.add("Guava");
      System.out.println("The LinkedList is: " + l);
      l.removeFirst();
      l.removeLast();
      System.out.println("The LinkedList is: " + l);
   }
}

Output

The LinkedList is: [Apple, Mango, Pear, Orange, Guava]
The LinkedList is: [Mango, Pear, Orange]

Now let us understand the above program.

The LinkedList l is created. Then LinkedList.add() is used to add the elements to the LinkedList. Then the LinkedList is displayed. A code snippet which demonstrates this is as follows −

LinkedList<String> l = new LinkedList<String>();
l.add("Apple");
l.add("Mango");
l.add("Pear");
l.add("Orange");
l.add("Guava");
System.out.println("The LinkedList is: " + l);

The methods LinkedList.removeFirst() and LinkedList.removeLast() is used to remove the elements at the beginning and end of the Linked List respectively. Then the LinkedList is again displayed. A code snippet which demonstrates this is as follows −

l.removeFirst();
l.removeLast();
System.out.println("The LinkedList is: " + l);
raja
Published on 30-Jan-2019 07:56:54
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