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Delete first and last element from a LinkedList in Java
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
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);
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