What does EnumSet really mean?

Question

I have the following example:

import java.util.EnumSet;
import java.util.Iterator;

public class SizeSet {

    public static void main(String[] args) {
             


        

Answer 1

Given the following example:

....
public static final String S = "s";
public static final String M = "m";
public static final String L = "l";
....

Set sizeSet = new HashSet();
sizeSet.add(S);
sizeSet.add(M);

so, what is sizeSet in the above example?

EnumSet is nothing different from the above example, only that EnumSet is a special Set implementation that works with and optimized with enum types, that's all.