Enterprise Application Development 1

Vocabulary flashcards covering Java SE installation, primitive data types, memory sizes, casting, and core development concepts for Enterprise Application Development.

Java Runtime Environment (JRE)

Holds the Java Virtual Machine, libraries, and other components that are necessary to run a java programme.

Java Development Kit (JDK)

Contains the compilers, necessary debuggers, and the JRE.

Java Virtual Machine (VM)

The environment in which Java programs run.

javac

The console command used to compile a Java file (e.g., javac MyFirstJavaProgram.java).

java -version

The console command used to check the installed version of Java.

byte

Stores whole number from $-128$ to $127$; size is $1\,byte$.

short

Stores whole number from $-32,768$ to $32,767$; size is $2\,bytes$.

int

Stores whole number from $-2,147,483,648$ to $2,147,483,647$; size is $4\,bytes$.

long

Stores whole number from $-9,223,372,036,854,775,808$ to $9,223,372,036,854,775,807$; size is $8\,bytes$.

float

Stores fractional numbers with $6$ to $7$ decimal digits; size is $4\,bytes$.

double

Stores fractional numbers with $15$ decimal digits; size is $8\,bytes$.

char

Stores a single character or ASCII values; size is $2\,bytes$.

boolean

Stores true or false; size is $1\,bit$.

Camel lettering

Recommended naming convention for variables, starting with a lower case letter (e.g., numberOne).

Narrowing

Casting where content is copied to another variable while decreasing current value capacity.

Widening

Casting where content is copied to another variable while increasing current value capacity.

Tokens

Small individual units of a program, including Reserved Keywords, Identifiers, Literals, Operators, and Separators.

System.out.println()

The method used to output a line of data or text to the console.

Scanner

A class from java.util used to obtain user input (e.g., sc.nextInt()).

JAR

Java ARchive file; the standard executable format in Java.

MANIFEST.MF

A metadata file included in a JAR that defines attributes like Manifest-Version, Main-Class, and Build-By.

Operator Precedence

A ranking where a larger number indicates higher precedence; for example, Parentheses have a precedence of $15$.