Can someone explain

Question

import java.util.HashSet;
public class MyClass {
public static void main(String[ ] args) {
HashSet<String> set = new HashSet<String>();
set.add("dj");
set.add("Dj");
set.add("ajjj");
set.add("B");
set.add("Ajjj");
set.add("b");
System.out.println(set);
}
}

Answer 1

You should also write what exactly you need to explain.