Java Collection, LinkedList Exercises: Insert elements into the linked list at the first and last position
Java Collection, LinkedList Exercises: Exercise-6 with Solution
Write a Java program to insert elements into the linked list at the first and last position.
Sample Solution:-
Java Code:
import java.util.LinkedList;
public class Exercise6 {
public static void main(String[] args) {
// create an empty linked list
LinkedList<String> l_list = new LinkedList<String>();
// use add() method to add values in the linked list
l_list.add("Red");
l_list.add("Green");
l_list.add("Black");
System.out.println("Original linked list:" + l_list);
// Add an element at the beginning
l_list.addFirst("White");
// Add an element at the end of list
l_list.addLast("Pink");
System.out.println("Final linked list:" + l_list);
}
}
Sample Output:
Original linked list:[Red, Green, Black] Final linked list:[White, Red, Green, Black, Pink]
Pictorial Presentation:
Flowchart:

Java Code Editor:
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Java: Tips of the Day
getEnumMap
Converts to enum to Map where key is the name and value is Enum itself.
public static <E extends Enum<E>> Map<String, E> getEnumMap(final Class<E> enumClass) { return Arrays.stream(enumClass.getEnumConstants()) .collect(Collectors.toMap(Enum::name, Function.identity())); }
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