Tag: web technology

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Questions Related to web technology

Multiple choice technology web technology

Given: 12. public class AccountManager { 13. private Map accountTotals = new HashMap(); 14. private int retirementFund; 15. 16. public int getBalance(String accountName) { 17. Integer total = (Integer) accountTotals.get(accountName); 18. if (total == null) 19. total = Integer.valueOf(0); 20. return total.intValue(); 21. } 23. public void setBalance(String accountName, int amount) { 24. accountTotals.put(accountName, Integer.valueOf(amount)); 25. } 26. } 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.)

  1. Replace line 13 with private Map<String, int> accountTotals = new HashMap<String, int>();

  2. Replace line 13 with private Map<String, Integer> accountTotals = new HashMap<String, Integer>();

  3. Replace line 13 with private Map<String<Integer>> accountTotals = new HashMap<String<Integer>>();

  4. Replace lines 17–20 with int total = accountTotals.get(accountName); if (total == null) total = 0; return total;

  5. Replace lines 17–20 with Integer total = accountTotals.get(accountName); if (total == null) total = 0; return total;

  6. Replace line 24 with accountTotals.put(accountName, amount);
Reveal answer Fill a bubble to check yourself
B,E,F Correct answer
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Multiple choice technology web technology

Given a method declared as public static List process(List nums) A programmer wants to use this method like this // INSERT DECLARATIONS HERE output = process(input); Which pairs of declarations could be placed at // INSERT DECLARATIONS HERE to allow the code to compile? (Choose all that apply.)

  1. ArrayList<Integer> input = null; ArrayList<Integer> output = null;

  2. ArrayList<Integer> input = null; List<Integer> output = null;

  3. ArrayList<Integer> input = null; List<Number> output = null;

  4. List<Number> input = null; ArrayList<Integer> output = null;

  5. List<Number> input = null; List<Number> output = null;

  6. List<Integer> input = null; List<Integer> output = null;
Reveal answer Fill a bubble to check yourself
B,E,F Correct answer
Full explanation
Multiple choice technology web technology

Given: 3. import java.util.*; 4. public class Mixup { 5. public static void main(String[] args) { 6. Object o = new Object(); 7. // insert code here 8. s.add("o"); 9. s.add(o); 10. } 11. } And these three fragments: I. Set s = new HashSet(); II. TreeSet s = new TreeSet(); III. LinkedHashSet s = new LinkedHashSet(); When fragments I, II, or III are inserted, independently, at line 7, which are true? (Choose all that apply.)

  1. Fragment I compiles

  2. Fragment II compiles

  3. Fragment III compiles

  4. Fragment I executes without exception

  5. Fragment II executes without exception

  6. Fragment III executes without exception
Reveal answer Fill a bubble to check yourself
A,B,C,D,F Correct answer
Full explanation