Maps and sets are both collections of objects. In what ways are they different?
What will be an ideal response?
A set is a collection in which the objects are distinct. It can be efficiently searched to determine if the set
contains a particular object. A map contains objects that have keys and values. All of the keys in a map must be distinct, but the
values may not be distinct. A map can be searched to determine if it contains a particular key or value, and to retrieve the value
associated with a particular key.
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Write out the order of elements that are contained in a queue after the following operations are performed.
What will be an ideal response? ``` myQueue.enqueue(new Integer(8)); myQueue.enqueue(new Integer(6)); Integer num1 = myQueue.dequeue(); myQueue.enqueue(new Integer(3)); myQueue.enqueue(new Integer(4)); myQueue.enqueue(new Integer(15)); myQueue.enqueue(new Integer(12)); myQueue.enqueue(new Integer(9)); myQueue.dequeue(); myQueue.dequeue(); myQueue.dequeue(); myQueue.enqueue(new Integer(19)); ```
The __________ construct can be used to split an array into a number of values.
a. while() b. list() c. foreach() d. each()
Most users actually receive only a small amount of spam in their local email inbox. The majority is blocked before it even reaches the user.
Answer the following statement true (T) or false (F)
What information is returned by executing the command SELECT @@VERSION?
What will be an ideal response?