Map<String,Float> change = new HashMap<String,Float>(2);
change.put("USD",(float)2.0);
change.put("YEN",(float)4.0);
budget.setChange(change);
budget.addPerson(p1);
budget.addPerson(p2);
budget.addPerson(p3);
Expenditure exp1 = new Expenditure();
exp1.setOwner(p1);