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The HashSet class defines equality through its equals() method

A HashSet is equal to another object if the other object implements the Set interface, has the same size(), and contains all the same elements. import java.util.Arrays; import java.util.HashSet; import java.util.Set; public class MainClass {   public static void main(String[] a) {     String elements[] = { "A", "B", "C", "D", "E" };     Set set = new HashSet(Arrays.asList(elements));     elements = new String[] { "A", "B", "C", "D" };     Set set2 = new HashSet(Arrays.asList(elements));     System.out.println(set.equals(set2));   } } false