1. Correct syntax for boolean array of 24 elements

✔️ boolean[] arr = new boolean[24];
❌ boolean arr = new boolean[24];
❌ boolean arr[24];
❌ boolean[24] arr = new boolean[24];
❌ boolean arr[] = new boolean;

2. Last index = size − 1 = 23

✔️ 23
❌ 25
❌ 22
❌ 24

3. arr.fill(true) is NOT valid for arrays

✔️ FALSE
❌ TRUE

4. Arrays of class type need 2-phase initialization

✔️ TRUE
❌ FALSE

5. Arrays use arr.length, NOT arr.length()

✔️ FALSE
❌ TRUE

6. Arrays can be sized dynamically but CANNOT be resized

✔️ An array can be sized dynamically, but it cannot be resized without allocating a new array.
❌ An array can be sized dynamically & resized
❌ An array cannot be sized dynamically

7. Sum from index 1 to end: 23+34+45+56 = 158

✔️ 158
❌ 170
❌ 114
❌ 0

8. Collection with no duplicates

✔️ Set
❌ Queue
❌ List
❌ Map

9. Replace “charlie” with “foxtrot”

✔️ list.set(list.indexOf(“charlie”), “foxtrot”);
❌ list.add(“foxtrot”, index)
❌ list.set(“foxtrot”,”charlie”)
❌ list.set(“charlie”,”foxtrot”)
❌ list[2] = “foxtrot”

10. Remove last element (“echo”)

✔️ list.remove(list.size()-1);
❌ list.clear(“echo”)
❌ list.empty(“echo”)
❌ list.remove(list.size())
❌ list.remove(5)

11. Enhanced for-loop that prints all elements

✔️ String list name
❌ int String name
❌ String iterator next
❌ iterator hasNext next
❌ String list next

12. HashMap can map ANY type to ANY type