Question 12: The following Java code maps books to the number of time…

1import java.util.*;
2public class Library {
3    TreeSet<String> popularBooks = new TreeSet<>();
4    TreeSet<String> lessReadBooks = new TreeSet<>();
5    public boolean isPopular(int count) {
6        return count > 2;
7    }
8    public void classifyBooks(HashMap<String, Integer> bookMap) {
9        for (Map.Entry<String, Integer> entry : bookMap.entrySet()) {
10            // LINE 1: if statement
11            {
12                popularBooks.add(entry.getKey());
13            } else {
14                lessReadBooks.add(entry.getKey());
15            }
16        }
17    }
18    public void displayBooks() {
19        System.out.println("Popular Books: " + popularBooks);
20        System.out.println("Less-read Books: " + lessReadBooks);
21    }
22    public static void main(String[] args) {
23        HashMap<String, Integer> bookMap = new HashMap<>();
24        bookMap.put("W", 4);
25        bookMap.put("X", 1);
26        bookMap.put("Y", 3);
27        bookMap.put("Z", 2);
28
29        Library lib = new Library();
30        lib.classifyBooks(bookMap);
31        lib.displayBooks();
32    }
33}

1Popular Books: [W, Y]
2Less-read Books: [X, Z]