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Java Tutorial
BOSS QUIZ
10 questions · 5 minutes · pass at 70% to clear the track.
05:00
Start
Q1.
A class can implement…
from Inheritance
One interface
Many interfaces
No interfaces
Only abstract classes
Q2.
A constructor has…
from Classes & Objects
No return type
A void return type
A Constructor return type
A this return type
Q3.
A class can extend…
from Inheritance
Multiple classes
Exactly one class
Zero classes (no inheritance)
Any number, with the diamond rule
Q4.
A class is instantiated with…
from Classes & Objects
create
new
init
alloc
Q5.
Most-used List implementation is…
from Collections Framework
LinkedList
ArrayList
Vector
Stack
Q6.
Streams are…
from Streams API
Eager collections
Lazy pipelines of operations
Threads
IO buffers only
Q7.
Most-used Map implementation is…
from Collections Framework
HashMap
TreeMap
Hashtable
LinkedHashMap
Q8.
A terminal operation triggers…
from Streams API
Nothing
Evaluation of the pipeline
Garbage collection
A compile error
Q9.
List.of(...) returns a list that is…
from Collections Framework
Mutable
Immutable
Lazy
Thread-local
Q10.
"this" inside an instance method refers to…
from Classes & Objects
The class itself
The current object
The package
The JVM
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