Apex Collections

Question 1

What are the 3 types of Apex Collections?

Answer 1

1. Lists
2. Sets
3. Maps

Question 2

True or False:

Collections are a special type of variable and must hold data of only one type?

Answer 2

True

Question 3

Which statements below are true?

Maps are:

1. a group of things
2. contains 2 parts: a key and a value
3. contains 2 parts: a key and a variable
4. there can be no duplicate keys
5. each key can only have one value
6. each key can have at least two values
7. different keys can have the same value
8. different keys cannot have the same value

Answer 3

1. a group of things
2. contains 2 parts: a key and a value
3. there can be no duplicate keys
4. each key can only have one value
5. different keys can have the same value

Question 4

Trigger.oldMap can be used for (select all that apply)

1. before update
2. update
3. after insert
4. after update
5. delete
6. before insert

Answer 4

answer: Update and Delete.

Question 5

Trigger.newMap can be used for (select all that apply):

1. update
2. after update
3. before update
4. delete
5. after insert
6. before insert

Answer 5

answer: before update, after insert, after update

Question 6

Trigger.old can be used for:

1. update
2. after update
3. before update
4. delete
5. after insert
6. before insert

Answer 6

Answer: update, delete

Question 7

Trigger.new can be used for:

1. update
2. after update
3. before update
4. delete
5. after insert
6. before insert

Answer 7

Answer:before update, before insert, after update, after insert