1import java.util.TreeSet;
2
3public class Main {
4
5  public static void main(String[] args) {
6    // Create a TreeSet
7    TreeSet<Integer> treeSet = new TreeSet<>();
8
9    // Adding elements to the TreeSet
10    treeSet.add(5);
11    treeSet.add(2);
12    treeSet.add(7);
13    treeSet.add(9);
14    treeSet.add(1);
15
16    // Printing the TreeSet
17    System.out.println("TreeSet: " + treeSet);
18
19    // Getting the first element
20    int firstElement = treeSet.first();
21    System.out.println("First Element: " + firstElement);
22
23    // Getting the last element
24    int lastElement = treeSet.last();
25    System.out.println("Last Element: " + lastElement);
26
27    // Checking if an element exists in the TreeSet
28    boolean contains = treeSet.contains(7);
29    System.out.println("Contains 7 in TreeSet: " + contains);
30
31    // Removing an element from the TreeSet
32    boolean removed = treeSet.remove(2);
33    System.out.println("Removed 2 from TreeSet: " + removed);
34
35    // Printing the updated TreeSet
36    System.out.println("Updated TreeSet: " + treeSet);
37
38    // Checking the size of the TreeSet
39    int size = treeSet.size();
40    System.out.println("Size of the TreeSet: " + size);
41  }
42
43}