Example: List Equality By Sorting in Java

// List Equality By Sorting
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

// Main class containing the entry point of the program
public class Main {
    public static void main(String[] args) {
        // Step 1: Create two lists with the same elements but different order
        List<String> list1 = new ArrayList<>(Arrays.asList("Apple", "Banana", "Orange"));
        List<String> list2 = new ArrayList<>(Arrays.asList("Orange", "Apple", "Banana"));
        List<String> list3 = new ArrayList<>(Arrays.asList("Apple", "Banana", "Grape")); // For negative test

        System.out.println("Original list1: " + list1);
        System.out.println("Original list2: " + list2);
        System.out.println("Original list3: " + list3);

        // Step 2: Create copies of the lists to avoid modifying originals
        List<String> sortedList1 = new ArrayList<>(list1);
        List<String> sortedList2 = new ArrayList<>(list2);
        List<String> sortedList3 = new ArrayList<>(list3);

        // Step 3: Sort the copied lists
        Collections.sort(sortedList1);
        Collections.sort(sortedList2);
        Collections.sort(sortedList3);

        System.out.println("\nSorted list1: " + sortedList1);
        System.out.println("Sorted list2: " + sortedList2);
        System.out.println("Sorted list3: " + sortedList3);

        // Step 4: Compare the sorted lists using List.equals()
        boolean areEqual1And2 = sortedList1.equals(sortedList2);
        boolean areEqual1And3 = sortedList1.equals(sortedList3);

        System.out.println("\nAre list1 and list2 equal (after sorting)? " + areEqual1And2);
        System.out.println("Are list1 and list3 equal (after sorting)? " + areEqual1And3);
    }
}