Java Collection, ArrayList Exercises: Reverse elements in a array list

Java Collection, ArrayList Exercises: Exercise-11 with Solution

Write a Java program to reverse elements in a array list.

Pictorial Presentation:

Java Collection, ArrayList Exercises: Reverse elements in a list

Sample Solution:-

Java Code:

import java.util.*;
  public class Exercise11 {
  public static void main(String[] args) {
  // Creae a list and add some colors to the list
  List<String> list_Strings = new ArrayList<String>();
  System.out.println("List before reversing :\n" + list_Strings);  
  System.out.println("List after reversing :\n" + list_Strings); 

Sample Output:

List before reversing :                                                
[Red, Green, Orange, White, Black]                                     
List after reversing :                                                 
[Black, White, Orange, Green, Red]  


Flowchart: Reverse elements in a list.

Java Code Editor:

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Java: Tips of the Day


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