Ch 2

Question 1

<p>What is a pixel?</p>

Answer 1

<p>A unit of illumination on the screen.</p>

Question 2

<p>What is a compile-time error?</p>

Answer 2

<p>An error that will affect the compilation and correct running of the file</p>

Question 3

<p>How do you create text?</p>

Answer 3

<p>g.drawString (&quot;Hello World, 100, 200);</p>

Question 4

<p>Run-time error</p>

Answer 4

<p>error that occurs during the execution of a program</p>

Question 5

<p>Syntax</p>

Answer 5

<p>syntax of a computer language is the set of rules that defines the combinations of symbols that are considered to be a correctly structured document or fragment in that language</p>

Question 6

<p>Semantics</p>

Answer 6

<p>semantics is the field concerned with the rigorous mathematical study of the meaning of programming languages
</p>

Question 7

<p>True or False: Java is not case-sensitive.</p>

Answer 7

<p>False</p>

Question 8

<p>What starts with uppercase letter?</p>

Answer 8

<p>Packages, Files, Classes</p>

Question 9

<p>What starts with a lowercase letter?</p>

Answer 9

<p>methods, objects, variables</p>

Question 10

<p>What does init stand for?</p>

Answer 10

<p>Initialization</p>

Question 11

Soft returns vs. hard returns

Answer 11

soft=computer generated

hard=clicking the enter key

Question 12

Which symbols must have matches?

Answer 12

() {} [] “” ‘’

Question 13

Which is correct:
my Method
myMethod 
MyMethod
My Method

Answer 13

myMethod

Question 14

What is the middle preprocessor directive?

Answer 14

import java.applet.*;

Question 15

in this method:
g.drawString (“sup”, 1,1)
What is the dot?

Answer 15

a method selection operator

Question 16

What two types of data does Java work with?

Answer 16

Primitive and Objects

Question 17

What is special about primitive data

Answer 17

It can’t be broken down any further

Question 18

How to set a background color

Answer 18

setBackground(Color.blue);

Question 19

How to set a size

Answer 19

setSize(1900, 1000);

Question 20

How to make arc

Answer 20

g.drawArc (100, 200, 300, 400, 270, 90);

Question 21

How to make filled in arc

Answer 21

g.fillArc (100, 200, 300, 400, 270, 90);

Question 22

In this command:
g.fillArc (100, 200, 300, 400, 270, 90);
What does 270 mean?

Answer 22

Start arc

Question 23

In the command:
g.fillArc (100, 200, 300, 400, 270, 90);
What does 90 mean?

Answer 23

End arc

Question 24

public is a ________

Answer 24

visibility modifier

Question 25

Name 3 visibility modifiers

Answer 25

public, private, protected

Question 26

Void is a ______

Answer 26

return type

Meaning: This method is reuturning nothing to calling method or class

Question 27

init and paint are what?

Answer 27

names of the method

idenitifier

Question 28

what goes in parentheses

Answer 28

arguments/parameters/coordinates/

all the same thing, but different words

Question 29

anything between curly braces is a

Answer 29

method block

Question 30

No semicolon if:

Answer 30

it has curly braces that belong to it

Question 31

What’s special about object data type?

Answer 31

It can be broken down

ex: a string can be broken down into characters

Question 32

What is PEMDAS

Answer 32

Parentheses, Exponents, Multiplication, division, addition, subtraction

Question 33

What is the difference between declare and initialize?

Answer 33

declare: create a memory location but not store data yet
Init: to store a value in a memory location

Question 34

name two primitive data types:

Answer 34

boolean, byte, char, double, float, int, long, short

Question 35

65 ascii

Answer 35

A

Question 36

97 ascii

Answer 36

a