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Java Collection, LinkedList Exercises: Get the first and last occurrence of the specified elements in a linked list

Java Collection, LinkedList Exercises: Exercise-10 with Solution

Write a Java program to get the first and last occurrence of the specified elements in a linked list.

Sample Solution:-

Java Code:

import java.util.LinkedList;
import java.util.Iterator;
  public class Exercise10 {
  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");
          l_list.add("Pink");
          l_list.add("orange");
      
      // print original list
   System.out.println("Original linked list:" + l_list);  
 
   // Find first element of the List
    Object first_element = l_list.getFirst();
    System.out.println("First Element is: "+first_element);
 
    // Find last element of the List
    Object last_element = l_list.getLast();
    System.out.println("Last Element is: "+last_element);
 }
}

Sample Output:

Original linked list:[Red, Green, Black, Pink, orange]                 
First Element is: Red                                                  
Last Element is: orange

Pictorial Presentation:

Java Collection Linked-list: Get the first and last occurrence of the specified elements in a linked list.

Flowchart:

Flowchart: Get the first and last occurrence of the specified elements in a linked list

Java Code Editor:

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Previous: Insert some elements at the specified position into a linked list.
Next: Display the elements and their positions in a linked list.

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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