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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:

Java Collection Linked-list: Insert elements into the linked list at the first and last position.

Flowchart:

Flowchart: Insert the specified element at the specified position in the linked list.

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()));
}

Ref: https://bit.ly/3xXcFZt