ArrayLists

What will print when the code executes?

List<Integer> list1 = new ArrayList<Integer>();

list1.add(new Integer(1));

list1.add(new Integer(2));

list1.add(new Integer(3));

list1.add(2, new Integer(4));

list1.add(new Integer(5));

System.out.println(list1);

• [1, 2, 3, 4, 5]

• [1, 4, 2, 3, 5]

• [1, 2, 4, 3, 5]

• [1, 2, 4, 5]

What will print?

List<String> list1 = new ArrayList<String>();

list1.add("Anaya");

list1.add("Layla");

list1.add("Sharrie");

list1.add(1, "Sarah");

System.out.println(list1);

• ["Anaya", "Sarah", "Layla", "Sharrie"]

• ["Anaya", "Layla", "Sharrie", "Sarah"]

• ["Sarah", "Anyar", "Layla", "Sarah"]

• ["Anaya", "Layla", "Sarah","Sharrie", ]

What will be printed?

List<Integer> list1 = new ArrayList<Integer>();

list1.add(5);

list1.add(4);

list1.add(3);

list1.add(1, 2);

System.out.println(list1);

• [5, 4, 3, 2]

• [5, 4, 1, 3]

• [2, 5, 4, 3]

• [5, 2, 4, 3]

What will be printed?

List<Integer> list1 = new ArrayList<Integer>();

list1.add(1);

list1.add(3);

list1.add(2);

list1.add(1);

System.out.println(list1);

• [1, 3, 2]

• [1, 3, 2, 1]

• [1, 1, 2, 3]

• [1, 2, 3]

What will be printed?

List<Integer> list1 = new ArrayList<Integer>();

list1.add(new Integer(1));

list1.add(new Integer(2));

list1.add(new Integer(3));

list1.set(2, new Integer(4));

list1.add(2, new Integer(5));

list1.add(new Integer(6));

System.out.println(list1);

• [1, 2, 3, 4, 5]

• [1, 2, 4, 5, 6]

• [1, 2, 5, 4, 6]

• [1, 5, 2, 4, 6]

What will be printed?

List<String> list1 = new ArrayList<String>();

list1.add("Anaya");

list1.add("Layla");

list1.add("Sharrie");

list1.set(1, "Destini");

list1.add(1, "Sarah");

System.out.println(list1);

• ["Sarah", "Destini", "Layla", "Sharrie"]

• ["Sarah", "Destini", "Anaya", "Layla", "Sharrie"]

• ["Anaya", "Sarah", "Sharrie"]

• ["Anaya", "Sarah", "Destini", "Sharrie"]

What will be printed?

List<Integer> numList = new ArrayList<Integer>();

numList.add(new Integer(1));

numList.add(new Integer(2));

numList.add(new Integer(3));

numList.set(2,new Integer(4));

numList.add(1, new Integer(5));

numList.add(new Integer(6));

System.out.println(numList);

• [1, 2, 3, 4, 5]

• [1, 2, 4, 5, 6]

• [1, 2, 5, 4, 6]

• [1, 5, 2, 4, 6]

What will be printed?

List<Integer> list1 = new ArrayList<Integer>();

list1.add(new Integer(1));

list1.add(new Integer(2));

list1.add(new Integer(3));

list1.remove(1);

System.out.println(list1);

• [2, 3]

• [1, 2, 3]

• [1, 2]

• [1, 3]

What will be printed?

List<Integer> list1 = new ArrayList<Integer>();

list1.add(new Integer(1));

list1.add(new Integer(2));

list1.add(new Integer(3));

list1.remove(2);

System.out.println(list1);

• [2, 3]

• [1, 2, 3]

• [1, 2]

• [1, 3]

Which of the following is a reason to use a list (assume an object of the class ArrayList) instead of an array?

• A list will always use less memory than an array.

• A list can store objects, but arrays can only store primitive types.

• A list has faster access to the last element than an array.

• A list resizes itself as necessary as items are added, but an array does not.