import java.util.*; class KeyMaster { public int i; public KeyMaster(int i) { this.i = i; } public boolean equals(Object o) { return i == ((KeyMaster)o).i; } public int hashCode() { return i; } } public class MapIt { public static void main(String[] args) { Set set = new HashSet(); KeyMaster k1 = new KeyMaster(1); KeyMaster k2 = new KeyMaster(2); set.add(k1); set.add(k1); set.add(k2); set.add(k2); System.out.print(set.size() + “:”); k2.i = 1; System.out.print(set.size() + “:”); set.remove(k1); System.out.print(set.size() + “:”); set.remove(k2); System.out.print(set.size()); } } What is the result?()
- A 4:4:2:2
- B 4:4:3:2
- C 2:2:1:0
- D 2:2:0:0
- E 2:1:0:0
- F 2:2:1:1
- G 4:3:2:1