Ch1 Sec.3-4

Question 1

comment?

Answer 1

not read by code but there for other programmers to read 2 types of comments

-sometimes code is commented out temporarily too so it does not execute

Question 2

Single-line comment?

Answer 2

// then whatever the comment is. usually after code.

Question 3

multi-line comment?
or
block comment

Answer 3

/* whatever the comment is and then ended with */
*/ can be used with a single line too

Question 4

whitespace? / newlines?

Answer 4

spaces or hit return and leave a space.. used to make code readable.
-indentations are good too so its easy to see which code goes with what or if code is embedded within code then it can be seen.

Question 5

are blank lines considered code?

Answer 5

yes but it is ignored by compiler most of the time

Question 6

syntax error?

Answer 6

the symbols in a program are used incorrectly.

–missing a semicolon.. etc.

Question 7

do upper and lowercase letter matter in the code?

Answer 7

yes, especially with the name of objects or any commands used.

Question 8

compile time error?

Answer 8

error that the compiler detects

Question 9

Logical error?

Answer 9

cant be detected by the compiler and instead the program does something you dont want because you used the wrong code.
logical errors are also called bugs

Question 10

compiler warning?

Answer 10

sometimes logical issues are found but the code can still pass errors and therefore the code can be compiled. warnings should not exist b/c it can cause logical errors.

Question 11

program also called a?

Answer 11

application

Question 12

assembly language?

Answer 12

human readable processor instructions

Question 13

compiler?

Answer 13

translates language program into low level machine instructions.. 0s and 1s

Question 14

machine instruction?

Answer 14

0s and 1s stored in memory, tells processor to carry out operations like multiplication.

Question 15

the following identifiers are part of what? string, system, out, println.

Answer 15

Java Standard Library.

Question 16

what is the Java Standard Library?

Answer 16

identifiers that other programmers have pre-defined using sets of classes and methods.

Question 17

is Java Case sensitive?

Answer 17

Yes

best practice is to use identifiers that are different and not the same word with different caps.

Question 18

what letters and symbols can be used as part of an identifiers name?

Answer 18

uppercase and lowercase
any letter
the symbols:
$ , _
0 through nine

Question 19

what is the preferred case (upper/lower) for identifiers?

Answer 19

1st letter of each word should be uppercase ,

Question 20

how is a name in java written in code?

Answer 20

series of identifiers separated by the period character.

Question 21

compiler?

Answer 21

translates computer language (source code) into code for the processor.(into target language)

Question 22

interpreter?

Answer 22

like a compiler but it also executes the code and does so one line at a time.

Question 23

how is java code translated and why does this allow it to be used on many devices?

Answer 23

the high level language (java) is run through an interpreter where it becomes the target language of bytecode. this code works universally on cpus.

Question 24

byte code?

Answer 24

one level above machine language and requires cpus to have bytecode compilers onboard in order for the code to work on its system.

Question 25

IDE?

Answer 25

IDE= integrated development environment – allows set of tools to be used to edit or create software (java).

Question 26

can the command line be used as an interpreter/ compiler?

Answer 26

yes. java developer kit - SDK does not have its own compiler.