Stream API

Question 1

1. What is the difference between an intermediate operation and a terminal operation?
2. When is a stream traversed?

Answer 1

1. An intermediate operation returns a new stream. A terminal operation consumes the stream
2. When a terminal operation is executed

Question 2

Do the operations of a stream modify its source?

Answer 2

No

Question 3

What are the 3 components of a stream pipeline?

Answer 3

• Source
• 0 or more intermediate operations
• 1 terminal operation

Question 4

What are the 2 most common ways of creating a stream?

Answer 4

1. collection.stream()
2. Arrays.stream(...)

Question 5

What is Collectors and what does it do?

Answer 5

Collectors is an implementation of Collector and it provides many static methods to perform reduction operations

Question 6

Is it a good practice to modify the source of an active stream?

Answer 6

Absolutely not. Refrain from modifying the source of an active stream

Question 7

How can a stream be used to produce a new collection?

Answer 7

stream.collect(Collectors...)