Grade 9 Coding and Robotics: JGrasp and Java Flashcards

A set of vocabulary flashcards covering Java fundamentals, JGrasp interface, data types, and variable naming rules based on the Grade 9 Coding and Robotics test.

.java

The file extension of a Java source code file.

Red Man icon

The button in JGrasp used to run a program.

double

A data type used to store decimal numbers with high precision.

playerScore

An example of a valid variable name in Java, following the camelCase convention without spaces, hyphens, or starting digits.

for loop

A loop best suited for repeating an action a specific number of times.

Compiler

A tool that translates source code into bytecode.

JVM

Stands for Java Virtual Machine; it runs Java programs on different platforms.

Boolean

A data type that stores true or false values.

String

A data type used to store text, such as "John".

Comment

Text in a program that is ignored by the computer.

int

A data type used for whole numbers (integers), such as declarations like $int\,marks = 85$.

char

A data type used to store a single character, such as $'A'$.

Variable Parts

The three parts of a variable: data type, name (identifier), and value.

Main Method

The essential method used as the starting point for a Java program's execution.

Case Sensitivity

An attribute of Java where the language distinguishes between uppercase and lowercase letters.

Class

A blueprint used to create an object.

Object

The actual instance created from a class.

counter++

An expression used in a loop to increment the value of the counter variable by $1$.

Invalid Variable: 1marks

A variable name that is invalid because it starts with a number.

Invalid Variable: learner name

A variable name that is invalid because it contains a space.

Invalid Variable: score-total

A variable name that is invalid because it contains a hyphen.