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Collections and Generics

Question : 45

Total: 53

Given:

1. public class AccountManager {
2.   private Map accountTotals = new HashMap();
3.   private int retirementFund;
4.
5.   public int getBalance(String accountName) {
6.    Integer total = (Integer) accountTotals.get(accountName);
7.    if (total == null)
8.    total = Integer.valueOf(0);
9.    return total.intValue();
10.   }
11.   public void setBalance(String accountName, int amount) {
12.    accountTotals.put(accountName, Integer.valueOf(amount));
13.   }
14. }

This class is to be updated to make use of appropriate generic types, with no changes in behavior (for better or worse). Which of these steps could be performed? (Choose three.)

Replace line 2 with
private Map < String, int > accountTotals = new HashMap < String, int > ();
Replace line 2 with
private Map < String, Integer > accountTotals = new HashMap < String, Integer > ();
Replace line 2 with
private Map < String < Integer > > accountTotals = new HashMap < String < Integer > > ();
Replace lines 6–9 with
int total = accountTotals.get(accountName); if (total == null) total = 0; return total;
Replace lines 6–9 with
Integer total = accountTotals.get(accountName); if (total == null) total = 0; return total;
Replace lines 6–9 with
return accountTotals.get(accountName);
Replace line 12 with
accountTotals.put(accountName, amount);
Replace line 12 with
accountTotals.put(accountName, amount.intValue());

Validate

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