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Question 1: import java.util.*;
public class Mapit {
public static void main(String[] args) {
Set<Integer> set = new HashSet<Integer>();
Integer i1 = 45;
Integer i2 = 46;
set.add(i1);
set.add(i1);
set.add(i2); System.out.print(set.size() + " ");
set.remove(i1); System.out.print(set.size() + " ");
i2 = 47;
set.remove(i2); System.out.print(set.size() + " ");
}
}

What is the result?

1. 2 1 0
2. 2 1 1
3. 3 2 1
4. 3 2 2