Arrays and ArrayLists Review

What is the ArrayList nums if it is initially [5, 3, 1] and the following code is executed?

nums.add(6);

nums.add(0, 4);

nums.remove(1);

• [4, 3, 1, 6]

• [5, 3, 1, 6]

• [4, 3, 6]

• [4, 5, 3, 6]

Which statement below is the correct way to retrieve the first element in the nums ArrayList?

• nums.get(0)

• nums[0]

• nums(0)

• nums[1]

Given the ArrayList nums with the values [3, 7, 6, 0], what code below is the proper way to change the 7 to be a 5?

• nums.set(1, 5)

• nums.set(7, 5)

• nums.set(5, 2)

• nums[2] = 5

Given the nums ArrayList with the values [5, 4, 3, 2], what statement below removes the value 3 from the list?

• nums.remove(2)

• nums.remove(3)

• nums.get(2) = null

• nums.remove(1)

Given the nums ArrayList with the values [1, 2, 3, 4, 6], what code below can be used to add a 5 between the 4 and 6 in the list?

• nums.add(4, 5)

• nums.add(5, 4)

• nums.add(5, 5)

• nums.add(5)

Which statement is the correct declaration and initialization of an ArrayList of String values?

• ArrayList<String> name;

  name = new ArrayList<String>();

• ArrayList name;

  name = new ArrayList<String>();

• ArrayList<String> name;

  name = ArrayList<String>();

• String<ArrayList> name;

  name = new String<ArrayList>();

What is printed?

ArrayList<Integer> alist;

alist = new ArrayList<Integer>();

alist.add(1);

alist.add(2);

alist.remove(1);

alist.add(1, 3);

alist.set(1, 4);

alist.add(5);

System.out.println(alist);

• [1, 4, 5]

• [1, 4, 3, 5]

• [2, 4, 5]

• [2, 4, 3, 5]

Which term describes the process of converting a primitive type into an object wrapper?

• Autoboxing

• Polymorphism

• Encapsulation

• Inheritance

What is the process of converting a primitive data type into an object called?

• Parsing

• Casting

• Wrapping

• Unboxing

What do we call the action of changing an object to a primitive type of data (int, double, etc.)?

• Unboxing

• Casting

• Parsing

• Wrapping