It's a large collection of electrical switches(bits) 

a switch can be off or on

if on current flows

if off, no current or little current flows

• Kib ( Kibibyte) - 2¹⁰= 1024 bytes
• Mib (Mebibyte) - 2^{20 =} 1024 Kib
• Gib(Gibibyte) - 2³⁰ = 1024 Mib
• Tebibyte (Tib) - 1024 Gib
• Pebibyte (Pib) - 1024 Tib

American Standart Code for information Interface

and it's equal to 2_{^{8 =}} 256   

From 0 to 255

uses for foreign languanges as the =y have way more simbols that need to be represented.

2^{16 =}  65,536

From 0 to 65535

.java extension files are saved in UNICODE

It's mostly use for Memory address

• 0
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• A
• B
• C
• D
• E
• F

"ASSEMBLERS"

is one kind of source code.

Reads the entire source code and translates it to a machine code but IT DOES NOT RUN the code.

compilers execute faster than interpreters.

It make use of both !

javac  is the compiler program 

java.class is the byte code , when you execute it the java it will run it.

A model, or framework for analysis

a way of looking at some area of study

a way of doing things

• Procedural
• Object-Oriented

it looks at the overall process

divide process into smaller atomic tasks

this is TASK ANALYSIS or TASK DECOMPSITION

it leads to creation of an algorithm

It's a procedure, or a series of steps for solving a problem.

what needs to be done?

order in which it needs to be done?

• Sequence
• Selection
• Repetition

What data (properties) are needed, which methods are carried out

how can one model or represent those properties and methods in computer code.

Java Virtual Machine/ Java Runtime Enviroment 

this is the interpreter program, this is the java.exe program

Just in time compilation,

allows byte code to be compiled to native machine code just before it's required.

Java source

is then compiled into JAVA BYTE code

which is then interpreted by the JVM /jJRE

the Java application Programmer Interface

has thousands of useful classes that are stored in several hunderd packages or class libraries that we can access.

to access any package we can add an import statement to our program. this tells the Java Virtual Machine where to go in the library to find the code that it needs to run our program.

by calling the nextline method

input.nextline();