Unit 2: Using Objects - 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	25
Java Integer Overflow	medium	19
Java Overloaded Constructor Calls	medium	14
String Substring Method Behavior	medium	12
Static Variable in a Constructor	medium	9
Java Math Library Expression	medium	8
Recursive Power Method Output	medium	10
Integer Division and Type Casting	medium	11
Data Type For Precise Decimal Arithmetic	medium	6
Nested For Loop Execution Count	medium	4
Object Reference Variable Aliasing	medium	6
Polymorphism and Method Overriding	medium	6
Java String Method Behavior	medium	3
String Substring Method	medium	1
Integer Division and Type Promotion	medium	3
Java ArrayList Method Operations	medium	2
Java Scanner Input Validation	medium	2
Type Casting and Truncation	medium	1
Java Expression with Type Casting	medium	5
Recursive String Method Output	medium	1

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Unit Leaderboard

Rank	User	Correct Count	Attempt Count	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	michael.2103ll	18	28	0m 00s	1,700
#5	samyrabahfc	14	24	0m 00s	1,300
#6	angelajxi11	12	15	0m 00s	1,170
#7	lightingstrikes1342	9	9	0m 00s	900
#8	thewrizzler6	9	10	0m 00s	890
#9	ntgamja1	22	24	22m 11s	849
#10	diceans	8	10	0m 00s	780

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