Section 1
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System Class
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Last updated
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Date created
Mar 1, 2020
Cards (110)
Section 1
(50 cards)
System Class
refers to the standard output device for a system
Java Compiler
converts source code into binary program
Java
can be run on wide variety of computers
Arguments
pieces of information passed to method
Java applications
called Java stand-alone programs
Debugging
freeing program of all errors
static
reserved keyword; means method accessible and usable even though no objects of class exist
Inheritance
important feature of object-oriented programs
void
use in main() method header
Java
developed by Sun Microsystems
Machine Language
low-level programming language
Access Specifier
defines how class can be accessed
Logic Errors
incorrect order or procedure
Literal String
will appear in output exactly as entered
Source Code
programming statements written in high-level programming language
Applets
programs embedded in Web page
Machine Language
most basic circuitry-level language
High-level Programming Language
allows you to use a vocabulary of reasonable terms
Program Statements
carry out tasks of program
Method
requires information to perform its task
Java
runs on hypothetical computer known as Java Virtual Machine (JVM)
Logic Errors
also called semantic errors
Line Comments
start with two forward slashes (/ /)
Java applications
console and windowed applications
Syntax Error
misuse of language
Syntax
rules of language
Dots
separate classes, objects and methods
Comment out a statement
compiler does not translate and the JVM does not execute its command
Compiler/Interpreter
translates language statements into machine code
Class Body
everything between the braces
Program Comments
include author, date, class's name or function
Object-oriented Programs
create classes; create objects from classes; create applications
Procedural Programming
sets of operations executed in sequence
Method names
are always followed by parentheses
Polymorphism
means "many forms"; allows same word to be interpreted correctly in different situations based on context
Java
does not execute instructions on computer directly
Inheritance
helps you understand real-world objects
Java Interpreter
checks bytecode and communicates with operating system
Syntax Error
misspelled programming language word
Bytecode
statements saved in file
Program Comments
use to leave notes for yourself or others
Literal String
written between double quotation marks
Program
set of written instructions that tells computer what to do
Procedures
individual operations grouped into logical units
Inheritance
classes share attributes and methods of existing classes but with more specific features
Program Comments
non-existing statements added to program for documentation
Comment out a statement
turn it into a comment
Variables
named computer memory locations that hold values
Program Statements
similar to English sentences
Java Interpreter
executes bytecode instructions line by line within Java virtual machine
Section 2
(50 cards)
Package
group of classes
Scope
area in which it is visible to a program and in which you can refer to it using its simple identifier
Variable Declaration
statement that reserves named memory locations
Significant Digits
refers to mathematical accuracy
Initialization
assignment made when declaring variable
Constant
cannot be changed while program is running
Escape Sequence
represents single nonprinting character
Logical Operators
are used to determine the logic between variables or values
Primitive Type
simple data type
Floating-point Number
contains decimal positions
Relational Operator (comparison operator)
compares two items
Associativity
order in which operands used with operators
Java API
also called the Java class library
Dialog Box
messages placed for display
Block Comments
start with slash and asterisk (/ ); end with asterisk and forward slash ( /)
Javadoc Comments
begin with slash and two asterisks (/*); end with asterisk and forward slash ( /)
Parsing
process compiler uses to divide source code into meaningful portions
Variable
named memory location; used to store value
Javadoc Comments
special case of block comments
Assignment Operator
value to right assigned to variable on left; equal sign
Assignment
assignment made after variable declared
Boolean Variable
can hold only one of two values
String
built-in class; store and manipulate character swings
Logic Error
syntax correct but produces incorrect results when executed
Arithmetic Operators
perform calculations with values in programs
Boolean Logic
based on true or false comparisons
JOptionPane
produce dialog boxes
Concatenated
entire expression becomes String
Operand
value used on either side of the operator
Unnamed Constant
no identifier is associated with it
Escape Sequence
produces console output on multiple lines in command window
Literal Constant
value taken literally at each use
Assignment Operators
are used to assign values to variables
Numeric Constant
opposed to a literal constant
Name Variables
using naming rules for legal class identifiers
Char Data Type
holds any single character
Javadoc Comments
used to generate documentation
Operators
are used to perform operations on variables and values
Java API
prewritten Java classes
Reference Type
more complex data types
javac
compile command
Dialog Box
GUI object resembling window
import statement
used to access built-in Java class
Null String
empty string
Escape Sequence
begins with backslash followed by character
Comparison Operators
are used to compare two values
Data Type
type of data that can be stored
Logic Error
usually more difficult to find and resolve
Arithmetic Operators
are used to perform common mathematical operations
Named Constant
should not change during program execution
Section 3
(10 cards)