Java Collection, HashSet Exercises: Convert a hash set to a List/ArrayList
Java Collection, HashSet Exercises: Exercise-9 with Solution
Write a Java program to convert a hash set to a List/ArrayList.
Sample Solution:
Java Code:
import java.util.*;
public class Exercise9 {
public static void main(String[] args) {
// Create a empty hash set
HashSet<String> h_set = new HashSet<String>();
// use add() method to add values in the hash set
h_set.add("Red");
h_set.add("Green");
h_set.add("Black");
h_set.add("White");
h_set.add("Pink");
h_set.add("Yellow");
System.out.println("Original Hash Set: " + h_set);
// Create a List from HashSet elements
List<String> list = new ArrayList<String>(h_set);
// Display ArrayList elements
System.out.println("ArrayList contains: "+ list);
}
}
Sample Output:
Original Hash Set: [Red, White, Pink, Yellow, Black, Green] ArrayList contains: [Red, White, Pink, Yellow, Black, Green]
Pictorial Presentation:
Flowchart:

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
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