Java Reference
In-Depth Information
logic error 27
low-level language
programming 2
runtime error 27
screen resolution
10
machine language
9
8
main
method
17
software 2
source code 10
source program
memory 5
modem 8
motherboard 3
network interface card (NIC)
10
specific import
24
8
statement 10
storage devices
operating system (OS)
12
5
pixel 8
program
syntax error 26
wildcard import
2
24
Note
The above terms are defined in this chapter. Supplement I.A, Glossary, lists all the
key terms and descriptions in the topic, organized by chapters.
Supplement I.A
C
HAPTER
S
UMMARY
1.
A computer is an electronic device that stores and processes data.
2.
A computer includes both
hardware
and
software.
3.
Hardware is the physical aspect of the computer that can be touched.
4.
Computer
programs
, known as
software
, are the invisible instructions that control the
hardware and make it perform tasks.
5.
Computer
programming
is the writing of instructions (i.e., code) for computers to
perform.
6.
The
central processing unit (CPU)
is a computer's brain. It retrieves instructions
from
memory
and executes them.
7.
Computers use zeros and ones because digital devices have two stable states, referred
to by convention as zero and one.
8.
A
bit
is a binary digit 0 or 1.
9.
A
byte
is a sequence of 8 bits.
10.
A kilobyte is about 1,000 bytes, a megabyte about 1 million bytes, a gigabyte about 1
billion bytes, and a terabyte about 1,000 gigabytes.
11.
Memory stores data and program instructions for the CPU to execute.
12.
A memory unit is an ordered sequence of bytes.
13.
Memory is volatile, because information is lost when the power is turned off.
