importjava.util.*;
classKeyMaster{
publicinti;
publicKeyMaster(inti){this.i=i;}
publicbooleanequals(Objecto){returni==((KeyMaster)o).i;}
publicinthashCode(){returni;}
}
publicclassMapIt{
publicstaticvoidmain(String[]args){
Setset=newHashSet();
KeyMasterk1=newKeyMaster(1);
KeyMasterk2=newKeyMaster(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());
}
}
Whatistheresult?()