CH 14: Intro to Swing Components

What is the default layout manager for JFrame?

BorderLayout

When you create a(n) ____, you can group several components, such as JCheckBoxes, so a user can select only one at a time.

ButtonGroup

An object that is interested in an event is called a source.

False

When a JFrame is closed, you can end a program that you have forgotten to exit by typing Alt+E.

False

When a user closes a JFrame by clicking the Close button in the upper-right corner, the default behavior is for the JFrame to close and the application to terminate.

False

You cannot change the font of strings displayed in GUI components.

False

The ____ responds to keyboard focus events.

FocusListener

What class is the immediate parent of JFrame?

Frame

A ____ is a Component used to trigger an action or make a selection when the user clicks it.

JButton

A ____ consists of a label positioned beside a square; you can click the square to display or remove a check mark.

JCheckBox

A ____ is a component that combines a button or an editable field and a drop-down list.

JComboBox

Which statements create a JLabel that holds the words "Happy birthday" and adds the greeting to a JFrame object named aGreeting?

JLabel mygreeting = new JLabel("Happy Birthday"); aGreeting.add(mygreeting);

What is the immediate parent class of JTextField?

JTextComponent

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

Java Foundation Classes

The ____ responds to keyboard events.

KeyListener

Each Swing component is a descendant of a JComponent.

True

If a user enters more characters than specified in a JTextField, the extra characters are deleted.

True

Java provides you with a Font class from which you can create an object that holds typeface and size information.

True

The default behavior of a JFrame is to use the border layout format, which divides a container into regions.

True

When setting a JFrame's size, part of the area is unusable because it is consumed by the JFrame's title bar and borders.

True

You can use the setEnabled() method to make a component available or unavailable by passing true or false to it.

True

You can call a JFrame's setDefaultCloseOperation() method and use ____ as an argument to keep the JFrame visible and continue running the program.

WindowConstants.DO_NOTHING_ON_CLOSE

The ActionListener interface contains the ____ method specification.

actionPerformed(ActionEvent e)

The JButton, JCheckBox, JComboBox, and JRadioButton components are associated with the ____ method

addItemListener()

The ____ layout manager places components in a row, and when a row is filled, it automatically spills components into the next row.

flow

Look and feel comprises the elements of design, style, and ____ in any user interface.

functionality

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.

getItem()

The ____ method of JComboBox returns the maximum number of items the combo box can display without a scroll bar.

getMaximumRowCount()

A method that executes because it is called automatically when an appropriate event occurs is an event ____.

handler

Which of the following statements will change the value displayed in a JLabel named hello?

hello.setText("Hello");

Which of the following statements will correctly set a JFrame named myFrame to be visible?

myFrame.setVisible(true)

Which constructor constructs a new JTextField with the specified text and columns?

public JTextField(String text, int columns)

Which method overrides the default behavior for the JFrame to be positioned in the upper-left corner of the computer screen's desktop?

setBounds()

A component can be made available or unavailable by passing true or false to the ____ method.

setEnabled()

Which method do you use to assign a font object to a JLabel?

setFont()

Which method sets the state of the JCheckBox to true for selected or false for unselected?

setSelected

Within an event-driven program, a component on which an event is generated is the ____ of the event.

source

Swing components are UI elements such as dialog boxes and buttons. You can usually recognize their names because they begin with ____.

the letter J

Which method do you use to change the state of a JCheckBox?

void setSelected(boolean)

When constructing a Font object, which of the following arguments is NOT required?

weight