Example: List Equality Using Sets in Java

// List Equality Using Sets
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

// Main class containing the entry point of the program
public class Main {
    public static void main(String[] args) {
        // Step 1: Create lists, including one with duplicates
        List<Integer> listA = new ArrayList<>(Arrays.asList(1, 2, 3, 2));
        List<Integer> listB = new ArrayList<>(Arrays.asList(3, 1, 2));
        List<Integer> listC = new ArrayList<>(Arrays.asList(1, 2, 4)); // Different element
        List<Integer> listD = new ArrayList<>(Arrays.asList(1, 2, 2, 3)); // Same elements, different duplicates

        System.out.println("Original listA: " + listA);
        System.out.println("Original listB: " + listB);
        System.out.println("Original listC: " + listC);
        System.out.println("Original listD: " + listD);

        // Step 2: Convert lists to sets
        Set<Integer> setA = new HashSet<>(listA);
        Set<Integer> setB = new HashSet<>(listB);
        Set<Integer> setC = new HashSet<>(listC);
        Set<Integer> setD = new HashSet<>(listD);

        System.out.println("\nSet from listA: " + setA);
        System.out.println("Set from listB: " + setB);
        System.out.println("Set from listC: " + setC);
        System.out.println("Set from listD: " + setD);

        // Step 3: Compare the sets using Set.equals()
        boolean areEqualAAndB = setA.equals(setB);
        boolean areEqualAAndC = setA.equals(setC);
        boolean areEqualAAndD = setA.equals(setD); // Note: this will be true if sets are used

        System.out.println("\nAre listA and listB equal (using sets)? " + areEqualAAndB);
        System.out.println("Are listA and listC equal (using sets)? " + areEqualAAndC);
        System.out.println("Are listA and listD equal (using sets)? " + areEqualAAndD);
    }
}