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Java Collection, ArrayList Exercises: Retrieve an element from a given array list

Java Collection, ArrayList Exercises: Exercise-4 with Solution

Write a Java program to retrieve an element (at a specified index) from a given array list.

Pictorial Presentation:

Java Collection, ArrayList Exercises: Retrieve an element from a given list

Sample Solution:-

Java Code:

import java.util.*;
  public class Exercise4 {
  public static void main(String[] args) {
  // Creae a list and add some colors to the list
  List<String> list_Strings = new ArrayList<String>();
  list_Strings.add("Red");
  list_Strings.add("Green");
  list_Strings.add("Orange");
  list_Strings.add("White");
  list_Strings.add("Black");
  // Print the list
  System.out.println(list_Strings);
  // Retrive the first and third element
  String element = list_Strings.get(0);
  System.out.println("First element: "+element);
  element = list_Strings.get(2);
  System.out.println("Third element: "+element);
 }
}

Sample Output:

[Red, Green, Orange, White, Black]                                     
First element: Red                                                     
Third element: Orange

Flowchart:

Flowchart: Retrieve an element from a given 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