1. Introduction

Pagination is a useful technique for handling large sets of data. Java provides various ways to implement pagination, even with a Set. Although a Set in Java does not have a get method like a List, we can convert the Set to a List and then apply pagination using the subList method.

2. Program Steps

1. Import the required libraries.

2. Create a set of elements.

3. Convert the Set to a List.

4. Define the page size.

5. Calculate the total number of pages.

6. Loop through each page and display the elements of each page using the subList method.

3. Code Program

// Step 1: Import the required libraries
import java.util.*;

public class SetPagination {

    public static void main(String[] args) {

        // Step 2: Create a set of elements
        Set<String> items = new HashSet<>();
        for (int i = 1; i <= 25; i++) {
            items.add("Item " + i);
        }

        // Step 3: Convert the Set to a List
        List<String> itemList = new ArrayList<>(items);

        // Step 4: Define the page size
        int pageSize = 5;

        // Step 5: Calculate the total number of pages
        int totalPages = (int) Math.ceil((double) itemList.size() / pageSize);

        // Step 6: Loop through each page and display the elements of each page using the subList method
        for (int i = 0; i < totalPages; i++) {
            int fromIndex = i * pageSize;
            int toIndex = Math.min(fromIndex + pageSize, itemList.size());
            List<String> page = itemList.subList(fromIndex, toIndex);
            System.out.println("Page " + (i + 1) + ": " + page);
        }
    }
}

Output:

Page 1: [Item 1, Item 2, Item 3, Item 4, Item 5]
Page 2: [Item 6, Item 7, Item 8, Item 9, Item 10]
Page 3: [Item 11, Item 12, Item 13, Item 14, Item 15]
Page 4: [Item 16, Item 17, Item 18, Item 19, Item 20]
Page 5: [Item 21, Item 22, Item 23, Item 24, Item 25]

4. Step By Step Explanation

Step 1: Import the necessary classes from the java.util package.

Step 2: Create and initialize a Set with 25 items.

Step 3: Convert the Set to a List to make use of the subList method for pagination.

Step 4: Define the page size as the number of elements that each page will contain.

Step 5: Calculate the total number of pages required to display all elements given the page size.

Step 6: Loop through each page and, for every page, calculate the fromIndex and toIndex to get a subList representing the current page. Then, display the elements of each page.