com101-chp01

a set of written instructions that tells the computer what to do

Computer program

most basic circuitry-level language

a low level programming language

all programs gets translated into mahcine language

Machine Language

allows you to use a vocabulary of reasonable terms

high-level programming language

a specific set of rules for the language

syntax

similar to english sentences

commands to carry out program tasks

program statements

translates language statements into machine code

compiler or interpreter

freeing program of all errors

debugging

misuse of language rules

a mispelled programming language words

syntax error

also called semantic error

incorrect order or procedure

the program may run but provide innacurate output

logic errors

every language has its own specific, limited vocabulary, called

keywords

sets of operations executed in sequence

variables

names computer memory locations that hold values

procedures

individual operations grouped into logical units

procedural programming

create classes

blueprints for an object

create objects from classes

create applications

object-oriented programs

describes objects with common properties

a definition

an instance

class

characteristics that define an object

differentiate objects of the same class

the value of attributes is an objects state

attributes

specific, concrete instances of a class

objects

a self-contained block of program code that carries out an action

similar to procedure

method

conceals internal values and methods from outside course

provides security

keeps data and methods safe from inadvertent changes

encapsulation

an important feature of object-oriented programs

classes share attributes and methods of existing classes but with more

helps you understand real world objects

inherentance

means “many forms”

allows the same word to be interpreted corectly in different situations based on context

polymorphism

object-oriented general-purpose language

can be run on a wide variety of computers

does not execute instructions on the computer directly

runs on a hypothetical computer known as a java virtual machine (JVM}

advantages:

security features

architecturally neutral

java

programming statements written in high-level programming language

source code

a set of tools used to write programs

development environment

statements saved in a file

a binary program into which the java compiler converts source code

bytecode

checks bytecode and communicates with the operating system

executes bytecode instructions line by line within the written