LESSON 1 PART 1

CLASS

IS A USER-DEFINED OUTPUT BLUEPRINT OR TEMPLATE USED TO CREATE OBJECTS. IT IS THE FOUNDATIONAL BUILDING BLOCK OF OBJECT-ORIENTED PROGRAMMING (OOP) THAT GROUPS DATA AND BEHAVIOR INTO A SINGLE, REUSABLE LOGICAL ENTITY.

PUBLIC STATIC VOID MAIN (STRING [ ] ARGS)

IS THE DESIGNATED ENTRY POINT FOR ANY STANDALONE JAVA APPLICATION. JAVA VIRTUAL MACHINE OR JVM SPECIFICALLY LOOKS FOR THIS METHOD SIGNATURE TO BEGIN EXECUTING YOUR CODE.

SYSTEM.OUT.PRINTLN()

PRINTS DATA (TEXT, NUMBERS, OR VARIABLES) TO THE STANDARD OUTPUT CONSOLE AND AUTOMATICALLY APPENDS A NEW LINE.

VARIABLE

IS A NAMED CONTAINER USED TO STORE DATA IN COMPUTER MEMORY DURING PROGRAM EXECUTION.

DATA TYPE

DEFINES EXACTLY WHAT A KIND OF VALUE A VARIABLE CAN HOLD AND HOW MUCH MEMORY IT NEEDS.

OPERATORS

SPECIAL SYMBOLS OR KEYWORDS USED TO PERFORM SPECIFIC MATHEMATICAL, LOGICAL, COMPARISON, OR BITWISE MANIPULATIONS ON VARIABLES AND VALUES.

CONDITIONAL STATEMENTS

CONTROL DECISION-MAKING BY EXECUTING SPECIFIC CODE BLOCKS BASED ON BOOLEAN CONDITIONS.

LOOPS

REPEATEDLY RUN A BLOCK OF CODE UNTIL A DEFINED CONDITION IS NO LONGER MEET.

JAVA METHOD

IS A SELF-CONTAINED BLOCK OF CODE DESIGNED TO PERFORM A SPECIFIC TASK. EQUIVALENT TO FUNCTIONS, PROCEDURES, OR SUBROUTINES IN OTHER PROGRAMMING LANGUAGES, EVERY METHOD IN JAVA MUST BELONG TO A CLASS.

ACCESS MODIFIER

DETERMINES WHO CAN ACCESS THE METHOD.

STATIC KEYWORD

MEANS THAT A VARIABLE OR METHOD BELONGS TO THE CLASS ITSELF, RATHER THAN TO A SPECIFIC INSTANCE OF THAT CLASS.

RETURN TYPE

SPECIFIES THE TYPE OF VALUE THE METHOD RETURNS.

METHOD NAME

THE NAME USED TO CALL THE METHOD.

PARAMETERS

VARIABLES THAT RECEIVE VALUES PASSED TO THE METHOD.

METHOD BODY

CONTAINS THE STATEMENT/INSTRUCTIONS PERFORMED BY THE METHOD.

RETURN STATEMENT

SENDS A VALUE BACK TO THE CODE THAT CALLED THE METHOD.

METHODS WITH RETURN

IS A METHOD THAT PERFORMS A TASK AND RETURNS A VALUE TO THE CODE THAT CALLED IT. IT SPECIFIES THE DATA TYPE OF THE VALUE IT WILL RETURN.

METHODS WITHOUT RETURN

IS A METHOD THAT PERFORMS A TASK BUT DOES NOT RETURN A VALUE TO THE CODE THAT CALLED IT. IT USES THE VOID KEYWORD AS ITS RETURN TYPE.

PARAMETER

IS A VARIABLE DEFINED IN A METHOD’S DECLARATION THAT ACTS AS A PALCEHOLDER FOR RECEIVING DATA. IT SPECIFIES THE TYPE AND NAME OF DATA A METHOD NEEDS TO EXECUTE.

ARGUMENT

IS THE ACTUAL VALUE OR DATA PASSED INTO A METHOD WHEN THE METHOD IS CALLED. IT PROVIDES THE REAL DATA THAT THE METHOD’S PARAMETERS WILL USE DURING THE EXECUTION.

STATIC METHOD

IS A METHOD THAT BELONGS TO THE CLASS ITSELF, ALLOWING IT OT BE CALLED DIRECTLY USING THE CLASS NAME WITHOUT EVER CREATING AN INSTANCE OR OBJECT OF THAT CLASS.

NON-STATIC METHOD

IS A METHOD THAT BELONGS TO AN INDIVIDUAL OBJECT INSTANCE, MEANING YOU MUST FIRST CREATE AN OBJECT USING THE NEW KEYWORD BEFORE YOU CAN INVOKE THE METHOD.