AP Computer Science A/ Unit 2: Using Objects

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You’ll learn the fundamentals of Java, a programming language, and other foundational concepts for coding. You’ll explore reference data as a way to represent real-world objects in a digital world and discover methods to perform more complex operations.

Question Difficulty:

Question	Difficulty	Students Solved
String Concatenation With The Plus Operator	medium	16
Java Overloaded Constructor Calls	medium	13
String Substring Method Behavior	medium	11
Static Variable in a Constructor	medium	10
Java Math Library Expression	medium	11
Recursive Power Method Output	medium	8
Integer Division and Type Casting	medium	10
Data Type For Precise Decimal Arithmetic	medium	6
Nested For Loop Execution Count	medium	6
Object Reference Variable Aliasing	medium	6
Polymorphism and Method Overriding	medium	4
Java String Method Behavior	medium	2
String Substring Method	medium	1
Integer Division and Type Promotion	medium	2
Java ArrayList Method Operations	medium	1
Java Scanner Input Validation	medium	2
Type Casting and Truncation	medium	1
Java Expression with Type Casting	medium	2
Recursive String Method Output	medium	1
Analyzing Integer Overflow in Java	medium	1

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1 – 20 of 694

Unit Leaderboard

Rank	User	Correct Count	Attempt Count	Total Time	Score
#1	kaisuki	29	39	0m 00s	2,800
#2	sgarv2513	29	50	0m 00s	2,690
#3	nabihamanahal	21	28	0m 00s	2,030
#4	Potter16	27	40	12m 26s	1,824
#5	michael.2103ll	18	28	0m 00s	1,700
#6	samyrabahfc	14	24	0m 00s	1,300
#7	angelajxi11	12	15	0m 00s	1,170
#8	lightingstrikes1342	9	9	0m 00s	900
#9	thewrizzler6	9	10	0m 00s	890
#10	ntgamja1	22	24	22m 11s	849

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1 – 10 of 104

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