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Java Collection, ArrayList Exercises: Extract a portion of a array list

Java Collection, ArrayList Exercises: Exercise-12 with Solution

Write a Java program to extract a portion of a array list.

Pictorial Presentation:

Java Collection, ArrayList Exercises: Extract a portion of a list

Sample Solution:-

Java Code:

import java.util.*;
  public class Exercise12 {
  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");
  System.out.println("Original list: " + list_Strings);
  List<String> sub_List = list_Strings.subList(0, 3);
  System.out.println("List of first three elements: " + sub_List);
 }
}

Sample Output:

Original list: [Red, Green, Orange, White, Black]                      
List of first three elements: [Red, Green, Orange]

Flowchart:

Flowchart: Extract a portion of a 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