Unit 1: Primitive Types

Question 1

(int)

Answer 1

A data type in programming that represents whole numbers without decimal points. It stands for “integer” and can be used to store positive, negative, or zero values.

Question 2

*= operator

Answer 2

A shorthand notation used in programming to multiply and assign a value to a variable. It multiplies the current value of the variable by another value and stores the result back into the same variable.

Question 3

Access Modifiers

Answer 3

Keywords in programming that determine the accessibility of classes, methods, and variables. They control whether other parts of the program can access and use these elements.

Question 4

AP CSA

Answer 4

Stands for Advanced Placement Computer Science A. It is an advanced level course offered in high schools that focuses on teaching students the fundamentals of computer science and programming.

Question 5

Arithmetic Operators

Answer 5

Symbols used in programming to perform mathematical operations on numerical values. They include addition, subtraction, multiplication, division, and modulus.

Question 6

Array of chars

Answer 6

A data structure that stores a sequence of characters. It is often used to represent strings in programming.

Question 7

Assignment operator

Answer 7

Used to assign a value to a variable. It is represented by the equals sign (=) and it assigns the value on the right side of the equals sign to the variable on the left side.

Question 8

Binary Code

Answer 8

A coding system that uses only two digits, 0 and 1, to represent information. It is the fundamental language of computers.

Question 9

BlueJ

Answer 9

An integrated development environment (IDE) primarily used for teaching introductory Java programming. It provides a simplified interface and visual tools to help beginners understand object-oriented concepts.

Question 10

boolean

Answer 10

A data type that can only have two possible values - true or false. It is often used in programming to make decisions and control the flow of a program.

Question 11

Camel Casing

Answer 11

A naming convention where each word in a compound identifier is capitalized except for the first word, which starts with a lowercase letter. It is commonly used in programming languages to make variable and function names more readable.

Question 12

Classes

Answer 12

User-defined data types in object-oriented programming. They serve as blueprints for creating objects by defining their attributes and methods.

Question 13

Code Tracing

Answer 13

The process of manually following the execution of a program to understand how it works and identify any errors or bugs. It involves stepping through each line of code, keeping track of variable values and function calls.

Question 14

Compound Assignment Operators

Answer 14

Shorthand notations that combine an arithmetic operation with the assignment operator. They allow you to perform an operation and assign the result to a variable in a single step.

Question 15

Data Type Declaration

Answer 15

Specifies the type of data that a variable can hold in a programming language. It defines what kind of values can be stored and how those values can be manipulated.

Question 16

Decrement Operator (–)

Answer 16

Used to decrease the value of a variable by 1. It subtracts 1 from the current value of the variable.

Question 17

Decrementing

Answer 17

Refers to the process of decreasing a value by a certain amount. It is commonly used in programming to subtract a specific number from a variable.

Question 18

Division Symbol (/)

Answer 18

Used in programming to perform the mathematical operation of division between two numbers. It takes a dividend (the number being divided) and a divisor (the number dividing the dividend), and returns the quotient (the result of division).

Question 19

Double

Answer 19

In Java, is both a wrapper class for primitive type double and also represents real numbers with decimal points. It provides useful methods for performing mathematical operations on these numbers.

Question 20

Double

Answer 20

In Java, it is both a wrapper class for primitive type double and also represents real numbers with decimal points. It provides useful methods for performing mathematical operations on these numbers.

Question 21

final keyword (in context of constants)

Answer 21

Used to declare a constant variable in Java, meaning its value cannot be changed once assigned. It is often used to define values that should not be modified throughout the program.

Question 22

Final Modifier

Answer 22

Used in programming languages to indicate that a variable cannot be changed once it has been assigned a value or that a method cannot be overridden by subclasses.

Question 23

High-level programming languages

Answer 23

Languages that are designed to be easily understood by humans. They use natural language elements and abstract away low-level details, making it easier for programmers to write code.

Question 24

Increment Operator (++)

Answer 24

Used to increase the value of a variable by 1. It adds 1 to the current value of the variable.

Question 25

InputMismatchException

Answer 25

An exception that occurs when the input provided by the user does not match the expected data type or format. It is commonly thrown by methods in the Scanner class when trying to read a value of one type but encountering a different type.

Question 26

int

Answer 26

A primitive data type in Java used to store whole numbers without decimal points. It has a fixed size and represents integer values within a specific range.

Question 27

Integer.MAX_VALUE

Answer 27

Refers to the maximum possible integer that can be stored in Java’s int data type. It is a constant value equal to 2^31 - 1.

Question 28

Integer.MIN_VALUE

Answer 28

A constant in Java that represents the smallest possible value for an integer. It is equal to -2^31.

Question 29

IntelliJ

Answer 29

An integrated development environment (IDE) specifically designed for Java programming. It provides a user-friendly interface and a wide range of features to help developers write, debug, and test their code efficiently.

Question 30

Java Virtual Machine (JVM)

Answer 30

A virtual machine that executes Java bytecode. It provides the runtime environment for running Java applications and translates bytecode into machine code that can be executed by the computer’s operating system.

Question 31

Java

Answer 31

A high-level, object-oriented programming language that is widely used for developing applications and software. It is known for its platform independence, meaning that programs written in Java can run on any device or operating system with a Java Virtual Machine (JVM).

Question 32

Machine code

Answer 32

The lowest level of instructions that can be executed directly by a computer’s hardware. It consists of binary digits (0s and 1s) representing specific operations performed by the processor.

Question 33

Method

Answer 33

A named sequence of instructions that can be called or invoked to perform a specific task or action. Methods are used for code reusability, organization, and abstraction.

Question 34

Methods

Answer 34

Functions defined within a class that perform specific tasks or actions when called upon by an object. They can manipulate data, interact with other objects, or return values.

Question 35

Modulo Operator (%)

Answer 35

Used in programming to find the remainder when one number is divided by another. It takes a dividend and a divisor, and returns the remainder after performing division.

Question 36

Modulo Operator

Answer 36

Represented by the symbol %, returns the remainder of a division operation. It is used to determine if a number is divisible by another number.

Question 37

Multiplication Symbol (*)

Answer 37

Used in programming to perform the mathematical operation of multiplication between two numbers. It takes two operands, one on each side, and returns their product.

Question 38

nextBoolean()

Answer 38

A method used in Java to read the next boolean value from the input source. It retrieves and returns the next boolean token as a boolean data type (either true or false).

Question 39

nextDouble()

Answer 39

A method used in Java to read the next floating-point (decimal) value from the input source. It retrieves and returns the next double token as a double data type.

Question 40

nextInt()

Answer 40

A method used in Java to read the next integer value from the input source. It retrieves and returns the next integer token as an int data type.

Question 41

Object

Answer 41

An instance of a class that represents a specific entity or thing in a program. It contains both data (attributes) and behavior (methods).

Question 42

Objects

Answer 42

Instances of a class that represent real-world entities or concepts. They encapsulate data (attributes) and behavior (methods) into a single entity.

Question 43

Order of Operations

Answer 43

The order in which mathematical operations should be performed to obtain the correct result. It follows the acronym PEMDAS, which stands for Parentheses, Exponents, Multiplication and Division (from left to right), and Addition and Subtraction (from left to right).

Question 44

Overflow

Answer 44

Occurs when a calculation exceeds the maximum value that can be represented by a given data type. This can result in unexpected behavior or errors in programs.

Question 45

Post-increment

Answer 45

An operator that increases the value of a variable after using it in an expression. It returns the original value and then adds one unit to it.

Question 46

Pre-increment

Answer 46

An operator that increases the value of a variable before using it in an expression. It adds one unit to the original value and then returns the updated result.

Question 47

Primitive data type

Answer 47

Basic data types provided by programming languages, such as integers, floating-point numbers, booleans, and characters. They represent simple values and have predefined characteristics.

Question 48

Primitive data types

Answer 48

Basic data types that are built into a programming language and represent simple values. They include integers, floating-point numbers, characters, booleans, and more.

Question 49

Protected Access

Answer 49

A level of access control in object-oriented programming that allows members (variables and methods) to be accessed within the same class, subclasses, and classes in the same package.

Question 50

Reference Data Types

Answer 50

Data types that store references or memory addresses of objects rather than the actual values. They point to the location in memory where the object is stored.

Question 51

repl.it

Answer 51

An online coding platform that allows users to write, run, and debug code in various programming languages directly from their web browser.

Question 52

Scanner class

Answer 52

A built-in Java class that allows users to read input from various sources, such as the keyboard or a file.

Question 53

String class

Answer 53

A built-in class in Java that represents a sequence of characters. It provides various methods to manipulate and work with strings.

Question 54

String

Answer 54

A sequence of characters in Java, enclosed in double quotes. It represents text and can be manipulated using various methods.

Question 55

Syntax Error

Answer 55

A mistake in the structure or format of a program’s code that prevents it from being compiled or executed properly. It occurs when the code violates the rules and grammar of the programming language.

Question 56

System.out.print()

Answer 56

A method in Java that allows you to display text or values on the console. It does not add a new line after printing.

Question 57

System.out.println

Answer 57

A Java statement used to display output on the console. It prints the specified message or value and adds a new line character at the end.

Question 58

Variable Declaration

Answer 58

Refers to the process of creating variables by specifying their names and types before they are used in programming. It reserves memory space for storing values associated with those variables.

Question 59

Variable Initialization

Answer 59

The process of assigning an initial value to a variable when it is declared. It ensures that the variable has a valid starting value before it is used in the program.

Question 60

Visual Studio Code

Answer 60

A lightweight yet powerful source code editor developed by Microsoft. It supports multiple programming languages and offers various extensions to enhance productivity during coding.

Question 61

Void

Answer 61

A keyword used in method declarations to indicate that the method does not return any value. It is used when a method performs an action but does not produce a result.