Java Programming Concepts and Graphics

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Questions and Answers

Within an implementation of the `itemStateChanged()` method, you can use the `___` method to determine which object generated the event and the `getStateChange()` method to determine whether the event was a selection or a deselection.

getState()

getSource()

getItem() (correct)

getEvent()

`InputStream` is a child of `FileInputStream`.

False

A class diagram consists of a rectangle divided into three sections.

True

The methods in a subclass can use all of the data fields and methods that belong to its parent, with one exception: Members of the parent class are not accessible within a child class's methods.

private Signup and view all the answers

The `JMenu`s are added to the `JMenuBar` using the `___` method.

add() Signup and view all the answers

You can create a writable file by using the `Path` class `___` method?

newOutputStream() Signup and view all the answers

Unplanned exceptions that occur during a program's execution are also called execution exceptions.

False Signup and view all the answers

A good `toString()` method can be very useful in debugging a program.

True Signup and view all the answers

When an exception is a checked exception, client programmers are forced to deal with the possibility that an exception will be thrown.

True Signup and view all the answers

Match each term with the correct statement below:

Color class constant = GREEN Does not cycle between the colors = acyclic gradient Used to create polygons = fillPolygon() Works best with lighter drawing colors = 3D method Measures the part of characters that 'hang below' the baseline = descent Used to create lines = Line2D.Float class Controls how a drawing object is filled in = fill pattern Returns number of pixels as an integer = getScreenResolution() Draw a solid shape = fillPolygon() Signup and view all the answers

In most Java classes, the keyword `private` precedes each data field, and the keyword `___` precedes each method.

public Signup and view all the answers

The Swing classes are part of a more general set of UI programming capabilities that are collectively called the `___`.

Java Foundation Classes Signup and view all the answers

When components in a Swing UI require more display area than they have been allocated, you can use a `___` container to hold the components and allow the user to display the components using scrollbars.

JScrollPane Signup and view all the answers

Random files are also called `___` files.

instant access Signup and view all the answers

The Java compiler does not require that you catch or specify `___` exceptions.

runtime Signup and view all the answers

An array of bytes can be wrapped, or encompassed, into a `ByteBuffer` using the `ByteBuffer` `___` method.

wrap() Signup and view all the answers

When you use a(n) `___` statement, you state a condition that should be true, and Java throws an `AssertionError` when it is not.

assert Signup and view all the answers

In a(n) `___` program, the user might initiate any number of events in any order.

event-driven Signup and view all the answers

The value you store in memory is lost when the program ends or the computer loses power. This type of storage is `___`.

temporal Signup and view all the answers

The first step in drawing a 2D object is to specify how a drawn object is rendered.

True Signup and view all the answers

`___` polymorphism is the ability of one method name to work appropriately for different subclass objects of the same parent class.

Subtype Signup and view all the answers

If you provide an empty method within an abstract class, the method is an abstract method even if you do not explicitly use the keyword `___` when defining the method.

abstract Signup and view all the answers

An additional layered pane exists above the root pane, but it is not often used explicitly by Java programmers.

True Signup and view all the answers

You use the `___` method in statements to add points to a polygon.

addPoint() Signup and view all the answers

The `Object` class contains a(n) `___` method that takes a single argument, which must be the same type as the type of the invoking object.

equals() Signup and view all the answers

The `___` responds to keyboard focus events.

FocusListener Signup and view all the answers

A data file is used as a(n) `___` file when each record is stored in order based on the value in some field.

sequential access Signup and view all the answers

Swing components are UI elements such as dialog boxes and buttons; you can usually recognize their names because they begin with the letter `___`.

J Signup and view all the answers

Any of the file input or output methods in a Java program might throw an exception, so all the relevant code in the class is placed in a `___` block.

try Signup and view all the answers

To create your own throwable `Exception`, you must extend a subclass of `___`.

Throwable Signup and view all the answers

The capability to inherit from more than one class is called `___`.

multiple inheritance Signup and view all the answers

Study Notes