Java Chapter 2

Front 1

In Java, every value has a (1)

Back 1

(1) Type

Front 2

You use (1) to store values that you want to use at a later time

Back 2

(1) Variables

Front 3

Identifiers for variables, methods, and classes are composed of (1), (2) and (3) letters.

Back 3

(1) Letters
(2) Digits
(3) Underscore

Front 4

By convention, variable names should start with a (1) letter

Back 4

(1) Lowercase

Front 5

Use the (1) operator (=) to change the value of a variable

Back 5

(1) Assignment

Front 6

All (1) must be initialized before you use them

Back 6

(1) Variables

Front 7

Syntax 2.1 VARIABLE DEFINITION

typeName Variable Name = value;
or
typeName variableName

Purpose: To define a new variable of a particular (1) and optionally supply an initial (2)

Back 7

(1) Type
(2) Value

Front 8

Syntax 2.2 ASSIGNMENT

variableName = value;

Purpose: To assign a new (1) to a previously defined variable

Back 8

(1) Value

Front 9

(1) are entities in your program that you can manipulate by calling methods

Back 9

(1) Objects

Front 10

A method is a sequence of instructions that accesses the (1) of an (2)

Back 10

(1) Data
(2) Object

Front 11

A class defines the (1) that you can apply to (2)

Back 11

(1) Methods
(2) Objects

Front 12

The public interface of a class specifies what you can do with its (1). The (2) implementation describes how these actions are carried out.

Back 12

(1) Objects
(2) Hidden

Front 13

A parameter is an input to a (1)

Back 13

(1) Method

Front 14

The implicit parameter of a method call is the (1) on which the (2) is invoked

Back 14

(1) Object
(2) Method

Front 15

The (1) value of a method is a result that the method has computed for use by the (2) that called it

Back 15

(1) Return
(2) Code

Front 16

A method name is overlooked if a (1) has more than one (2) with the same name (but different parameter (3))

Back 16

(1) Class
(2) Method
(3) Types

Front 17

A (1) type denotes floating-point numbers that can have fractional parts

Back 17

(1) double

Front 18

In Java, numbers are not (1) and number types are not (2).

Back 18

(1) Objects
(2) Classes

Front 19

Numbers can be combined by arithmetic (1)

Back 19

Operations

Front 20

To construct new objects, use the new (1) followed by a (2) name and (3)

Back 20

(1) Operator
(2) Class
(3) Parameters

Front 21

Syntax 2.3 OBJECT CONSTRUCTION

new ClassName (parameters)

Purpose: To construct a new object, initialize it with the (1) parameters, and return a (2) to the constructed object

Back 21

(1) Construction
(2) Reference

Front 22

An (1) method does not change the state of its implicit parameters. A (2) method changes its state

Back 22

(1) Accessor
(2) Mutator

Front 23

Implementing a test Program (Place in Correct Order)
1. Display the results of the method calls
2. Inside the main method, construct one or more objects
3. Provide a tester class
4. Display the values that you expect to get
5. Supply a main method
6. Apply methods to the objects

Back 23

1. Provide a tester class
2. Supply a main method
3. Inside the main method, construct one or more objects
4. Apply methods to the objects
5. Display the results of the method calls
6. Display the values that you expect to get

Front 24

Syntax 2.4 IMPORTING A CLASS FROM A PACKAGE

import packageName.ClassName;

Purpose: To import a (1) form a package for use in a program

Back 24

(1) Class

Front 25

The API (1'') documentation lists the (1) and the (2) of the Java library

Back 25

(1'') Application Programming interface
(1) Classes
(2) Methods

Front 26

An object (1) describes the location of an object

Back 26

(1) Reference

Front 27

(1) variables store numbers. (2) variables store references

Back 27

(1) Number
(2) Object

Front 28

To show a frame, construct a (1) object, set it's size, and make it (2)

Back 28

(1) JFrame
(2) Visible

Front 29

In order to display a drawing in a frame define a (1) that extends the (2) class

Back 29

(1) Class
(2) Jcomponent

Front 30

Place drawing instructions inside the (1) method. That method is called whenever the component needs to be repainted

Back 30

(1) paintComponent

Front 31

The (1) class let you manipulate the graphics (2) -- such as the current color

Back 31

(1) Graphics
(2) State

Front 32

The Graphics2D class has (1) to draw (2) objects

Back 32

(1) Methods
(2) Objects

Front 33

Use a (1) to recover the Graphics2D (2) from the Graphics parameter of the (3) method

Back 33

(1) Cast
(2) Object
(3) paintComponent

Front 34

(1) and (2) are classes that describe graphical shapes

Back 34

(1) Ellipse2D.Double
(2) Line2D.Double

Front 35

The (1) method draws a string, starting at it's base point

Back 35

(1) drawString

Front 36

When you set a color in the (1) context, it is used for subsequent drawing operations

Back 36

(1) Graphics