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Quizzes > Programming & Software

AP CSA Unit 1 Test: Review Java Basics

Quick, free unit 1 AP CSA quiz to check your Java basics. Instant results.

Editorial: Review CompletedCreated By: Matilda BatteyUpdated Aug 28, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art quiz illustration on teal background with code icons and free AP CSA Unit 1 practice test challenge yourself

This AP CSA Unit 1 quiz helps you check Java basics like variables, data types, and simple program structure. Practice to spot gaps and build speed, then explore related skills with an AP CSP unit 2 test or strengthen math logic with an AP Stats unit 1 quiz. See your score instantly.

What is the correct signature of the main method in a Java program?
public static main(String[] args)
public void main(String args[])
public static void main(String[] args)
static public main(String[] args) void
The JVM looks for the method declared exactly as public static void main(String[] args) to start a Java application. It must be public so the JVM can access it, static so it can be called without instantiating the class, and return void. The parameter String[] args allows command-line arguments to be passed to the program.
Which of the following is a valid Java identifier?
my-var
2ndPlace
class
_count
Java identifiers must start with a letter, underscore (_), or dollar sign ($) and cannot be a reserved keyword. They may include digits after the first character. Hyphens are not permitted and identifiers cannot begin with a digit.
What does JVM stand for?
Java Variable Manager
Java Virtual Machine
Virtual Java Machine
Java Visual Module
JVM stands for Java Virtual Machine, which is the runtime environment that executes Java bytecode. It provides platform independence by interpreting compiled bytecode into native machine instructions. The JVM also handles memory management and garbage collection.
Which keyword is used to define a class in Java?
object
define
class
struct
In Java, the keyword class is used to declare a new class. It introduces a class definition containing fields, methods, constructors, and inner classes. Keywords like define or struct are not part of Java syntax.
How do you print the text "Hello, World!" to the console in Java?
System.out.println("Hello, World!");
print("Hello, World!");
echo "Hello, World!";
Console.write("Hello, World!");
The method System.out.println() sends text followed by a newline to the standard console output in Java. Other options like Console.write or echo are not valid Java statements. This method is part of the java.io.PrintStream class.
What is the default value of an uninitialized instance variable of type int in Java?
-1
 
null
0
In Java, instance variables of primitive types are automatically initialized to default values. For type int, the default is 0. Local variables inside methods are not automatically initialized.
Which of these is NOT a primitive data type in Java?
boolean
int
double
String
String is a reference type in Java, not a primitive. Primitive types include byte, short, int, long, float, double, char, and boolean. String is actually a class in java.lang.
What is the purpose of the public access modifier in Java?
Allows access from any other class
Makes a member immutable
Limits access to the defining class only
Restricts access to within the same package only
The public modifier makes classes, methods, or fields accessible from any other class in any package. No restrictions apply. Other modifiers like private or protected impose stricter access controls.
Which command compiles Java source code into bytecode?
javac
jar
java
javadoc
The javac command invokes the Java compiler that translates .java files into .class bytecode files. The java command runs bytecode on the JVM. javadoc generates API documentation and jar packages classes.
What is Java bytecode?
Platform-independent instructions for the JVM
Machine code for Intel CPUs
Source code written in Java
A deprecated scripting language
Java bytecode is the intermediate, platform-independent code generated by the Java compiler. The JVM interprets or JIT-compiles this bytecode into native machine instructions at runtime. Bytecode ensures Java's "write once, run anywhere" capability.
How do you correctly create a new object of class Sample in Java?
Sample obj = new Sample();
new Sample obj = Sample();
Sample obj = Sample.new();
obj Sample = new Sample();
In Java, new Sample() calls the constructor of Sample and returns a reference. You assign it to a variable of type Sample using Sample obj = new Sample();. Other syntaxes are invalid.
What is the output of this code snippet? System.out.println(5 + "5");
5 5
Error
10
55
When you use the + operator with a number and a String, Java converts the number to a String and concatenates. Thus 5 + "5" results in the String "55". No error occurs because implicit conversion is allowed.
Which syntax correctly denotes a multi-line comment in Java?
/* comment */
// comment
** comment **
Multi-line comments in Java start with /* and end with */. Single-line comments use //. XML style is not supported. Javadoc comments begin with /** but require additional semantics.
What happens if you compile a Java class without a main method and then try to run it?
It executes but does nothing
A runtime error: Main method not found
Compile-time error
It runs with a default main method
If no main method is present, the class compiles fine but the JVM throws a NoSuchMethodError at runtime because it cannot find public static void main(String[]). There is no default main method provided.
Which of the following statements about Java memory areas is correct?
Primitive types are always stored in the heap
Object instances are stored on the heap, and local variables are stored on the stack
All variables are stored in the method area
The stack stores class definitions and bytecode
In Java, objects and their instance fields reside on the heap, while local variables and method call frames reside on the stack. The method area holds class definitions, static variables, and bytecode. Understanding these areas is key for performance and garbage collection.
0
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Study Outcomes

  1. Understand Core Java Concepts -

    Recognize and explain Chapter 1 principles such as classes, objects, and fundamental syntax through targeted questions.

  2. Identify Class and Object Structures -

    Differentiate between class definitions and object instantiation to reinforce your grasp of object-oriented basics.

  3. Analyze Code Snippets -

    Review short Java examples to predict behavior and outputs, solidifying your analytical skills.

  4. Apply Syntax and Terminology -

    Use correct Java keywords and syntax in sample problems, improving accuracy for exams.

  5. Recall Essential Definitions -

    Test your memory of key terms like variables, methods, and data types with instant feedback.

  6. Track Your Progress -

    Receive immediate scores and insights to identify strengths and focus areas for further study.

Cheat Sheet

  1. Classes vs. Objects -

    In Java, a class is a blueprint (e.g., class Car ) and an object is an instance of that class (e.g., Car myCar = new Car();). Think "Class → Cookie cutter, Object → Cookie" - this helps you remember that objects are created from class templates. (Source: Oracle Java Tutorials)

  2. Constructors & Instantiation -

    A constructor shares its class name and initializes new objects: public Car(String model) { this.model = model; }. Always use new to call the constructor: Car c = new Car("Sedan");. Mnemonic: "C.R.E.A.T.E." - ClassName(), Run the constructor, Establish fields, Allocate memory, Tie reference, Execute setup. (Source: Oracle Java Documentation)

  3. Access Modifiers & Encapsulation -

    Use private to hide fields and public to expose safe methods: private int age; public int getAge() { return age; }. Encapsulation protects data integrity by forcing controlled access. Remember "P.I.E.": Private Implementation, Exposed via methods. (Source: Carnegie Mellon CS Guidelines)

  4. Primitive Data Types & Variables -

    Java has 8 primitives (byte, short, int, long, float, double, char, boolean) that store simple values and are faster than objects. For example, int count = 10; or double price = 19.99;. Tip: "I Believe In Creating Great Beautiful Code" helps recall: int, byte, boolean, char, float, double, long. (Source: Oracle Java SE)

  5. The Main Method & Entry Point -

    The signature public static void main(String[] args) is where Java programs start execution. "public" allows the JVM to call it, "static" means no object is needed, and "String[] args" holds command-line inputs. Think "PSVM" (Pronounced 'pass-vee-em') to recall keywords. (Source: MIT OpenCourseWare)

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