chapter-Java GUI Programming Using Swing-II

(b) Echo character.

Explanation- Password field displays encrypted text known as echo character(echoChar). The default echoChar is dot.

(a)cannot be changed or edited.

Explanation- A Label control displays text that the user cannot directly change or edit. The actual text displayed in a label is controlled by its text property.

(c)foreground color for the component.

Explanation: Foreground property sets the foreground color for the component, i.e., the text of the font will now appear in this color.

(b)horizontalAlignment.

Explanation: The image can be set towards the leading edge of the label using horizontalAlignment. This property controls the horizontal placement of label contents within the label.

(a)<windowname>.dispose().

Explanation: The <windowname>.dispose() method removes the specified window from the screen as well as from memory.

(c)text field.

Explanation- Text field control is a small text editor that provides all the basic text-editing facilities.

(d) action event.

Explanation- JTextField objects fire Action Events any time key is pressed, indicating that the user is finished with the field.

(c)dot(.).

Explanation- The character that is displayed in place of text being entered is known as echoChar. The default echoChar is a dot(.).

(d) specify the component that should receive the focus next when tab is pressed.

Explanation- nextFocusableComponent specifies the component that should receive the focus next when tab is pressed.

(b) scrollbar.

Explanation- A scrollbar is a bar representing a range of numbers and having a scrollable knob also called thumb.

(d) getPassword().

Explanation- To obtain password from a password field, getPassword() method is used.

(c) JTextArea.

Explanation- The JTextArea class provides a component that displays multiple lines of text and optionally allows the user to edit the text. If you need to obtain only one line of input from the user, you should use a text field.

(a)editor pane.

Explanation- The JEditorPane class is the foundation for Swing's styled text components and provides a mechanism through which we can add support for custom text formats.

(b) PropertyChange events.

Explanation- A JTextArea mainly fires PropertyChange events when lineWrap, wrapStyleWord or tabSize properties are changed.

(c) maximum value of scrollbar.

Explanation- int getMaximum() method returns the maximum value of scrollbar.

(b) setEnabled (boolean b)

Explanation- setEnabled (boolean b), enables or disables this component, depending on the value of the parameter b. An enabled component can respond to user input and generate events. Components are enabled initially by default.

(d) enabled and visible.

Explanation- The enabled property allows object to respond to user-generated events and visible property determines whether an object is visible on the screen.

(c) requestFocus().

Explanation- We can give focus to an object by using the requestFocus() method on the object.

(b) getValue().

Explanation- The getValue() method returns the current value of the scrollbar.

(a) input from user.

Explanation- Focus is the ability to receive user input through mouse or keyboard.

(c) Basic Controls.

Explanation- Basic Swing Controls are simple components that are used primarily to get input from the user.

(d)ChangeOccured.

Explanation- To add a common event handler, we add event, i.e., ChangedOccured in Handlers for ItemStateChanged dialog that appears when ellipsis is clicked in ItemStateChanged event.

(a) setValue().

Explanation- setValue method sets the slider’s current value and positions the slider’s knob at the new value.

(b)Replace button.

Explanation- Replace button replaces the text between positions given in Spos text field and Epos text field.

(c) ActionEvent.

Explanation- An action event occurs, whenever an action is performed by the user.

(d)focusLost event handler.

Explanation- A focusLost event handler is primarily used for verification and validation updates or for reversing or changing conditions that are set up in the object’s focus Gained event handler.

(b)an interface.

Explanation- ActionListener is an interface that contains the single method.

(c) what text will appear on the button.

Explanation- String getText() method returns the text displayed by the button.

(a) myWindow.setVisible(true);

Explanation- setVisible( boolean ) controls whether a Component and its children are displayed on the screen. myWindow.setVisible(true) method wiould make myWindow visible on the screen.

(c) Adjustment event type.

Explanation- The scrollbar fires an event of Adjustment event type, which is fired when a user drags or moves the knob/thumb of the scrollbar.

(d) 0-100.

Explanation- By default a slider represents a range 0-100 with no spacing for major or minor ticks.

(a) int getMajorTickSpacing().

Explanation-This method returns the number of values between major ticks, i.e., the distance measured in values, between each major tick mark.

(c) enabled property.

Explanation- The enabled property allows the object to respond to user-generated events such as keyboard and mouse events.

(b)Password Field.

Explanation- A Password Field can take input without showing it on screen. In place of text entered, it shows character as specified by its echoChar property.

(c) JtextField.

Explanation- JTextField implements a text field.

(a)label.

Explanation- With the JLabel class, you can display unselectable text and images. If you need to create a component that displays a string, an image, or both, you can do so by using or extending JLabel.

(c)setDefaultButton.

Explanation- JRootPane's setDefaultButton method is used to specify the default button for a top-level container.

(a) setEnabled

Explanation- setEnabled method enables or disables component, depending on the value of the parameter. An enabled component can respond to user input and generate events. Components are enabled initially by default.

(d) ButtonGroup.

Explanation- Creating a set of buttons with the same ButtonGroup object means that turning "on" one of those buttons turns off all other buttons in the group.

(a) setSelected()

Explanation- This method sets the value of the radio button. This method takes a boolean value either true or false. If you pass true value then the radio button will be selected otherwise the radio button is not selected.

(b) TextField.

Explanation- Text Field allows the user to enter a single line of text. It acts as a single line text editor.

(d) Actionlistener button is clicked.

Explanation- When a actionlistener button is clicked, control is transferred to the actionPerformed method.

(d) text area.

Explanation- If we need a component that displays or allows entry of more than one line, a JTextArea can be used.

(b)JRadioButton.

Explanation- The JRadioButton class implements a group of buttons in which only one button at a time can be selected.

(c) a list.

Explanation- A list is a component that performs basically the same function as a combo box, but it enables the user to choose a single value or multiple values.

(a) Jcheckbox.

Explanation- A check box is a control with a rectangular area that can be checked or unchecked. A check box is created through JCheckBox component.

(c) returns the label text.

Explanation- This method returns the text displayed by the label. It would return the value of text property.

(a) public void setHorizontal TextPosition (int alignment).

Explanation- This method set or get where in the label its contents should be placed horizontally. With Left, Center, Right alignment.

(b) ItemListener.

Explanation- A check Box fires many events but most commonly responded event is Item Event. An item event is handled through Item Listener.

(d) setLineWrap(true);

Explanation- This method sets line to be wrapped if they are too long to fit within the allocated width.

(b) setWordWrap(true);.

Explanation- setWordWrap(true) method sets to true if the multiline edit control automatically wraps words to the beginning of the next line when necessary.

(c) setEditable(false);.

Explanation- The user cannot edit the text if set editable property is set false.

(d) setText(String);.

Explanation- Sets the text displayed by the text area to String value specified in parenthsis.

(c) define the label.

Explanation- String as an argument displays the text by the label to String value specified in parenthesis.

(a) the LayoutManager what size to make the box.

Explanation- The int passed as an argument during instantiation tells the LayoutManager what size to make the box.

(b)compareTo().

Explanation- Compares values and returns an int which tells if the values compare is less than, equal, or greater than.

(d) the text displayed on the button.

Explanation- When instantiating a JButton string argument is passed to display text on the JButton.

(b) implemented by the class.

Explanation- The EventListener interface can be implemented by any class to register for event notifications at Events.

(a) e.getSource();

Explanation- The getSource method is used to obtain the source of an action event.

(d)0.

Explanation- The text is aligned to the centre by using one of the constant field values which is 0 in case of center alignment.

(b) setPreferredSize(Dimension).

Explanation- Set the preferred size of the receiving component.

(c) setText method.

Explanation- setText(String) method sets the label of the button.

(a) add an ItemListener.

Explanation- A JCheckBox is a component that has two states: selected or unselected. The user can change the state of a check box by clicking on it. We can attach an ItemListener to monitor events. The ItemEvent itself has the information: call getStateChange and compare the result to ItemEvent

(b) scrollbar.

Explanation- A scroll bar is a bar representing a range of numbers and having a scrollable knob.

(a) An Event.

Explanation- Whenever we click a mouse button, move the mouse or type on the computer keyboard, we are generating what is referred to as an event.

(c) setUnitIncrement(int UnitIncrement).

Explanation- setUnitIncrement(int UnitIncrement)method is used by JScrollBar component that sets the unit increment property with the given value.

(d) nextFocusaleComponent.

Explanation- JCheckBox offers nextFocusableComponent property that specifies the component that should receive the next focus when tab is pressed.

(c) JRadio Button component.

Explanation- In Java Swing, radio button can be created through JRadioButton component class.

(b) Border Customizer.

Explanation- We can give panel a titled border by clicking at ellipsis in its border property and then selecting Titled border from Border Customizer.

(d)mnemonic.

Explanation- A mnemonic property specifies the shortcut key or the access key for the radio button that can be combined with Alt to select the button during runtime.

(c) a Slider.

Explanation- Slider includes a labeled value scale which offers immediate value feedback to the user.

(b) Change Event.

Explanation- JSlider triggers a ChangeEvent whenever the user modifies any of its properties for which a stateChanged() method is required.

(a) getValue().

Explanation- The getValue() method returns the current value of the scrollbar.

(c) isSelected().

Explanation- By using isSelected() method we can find out whether the chechbox is selected or not. If this method returns true, it means the checkbox is selected otherwise not selected.

(a) wrapStyleWord.

Explanation- wrapStyleWord determines where line wrapping occurs. If true, the component attempts to wrap only at word boundaries.

(c) Label.

Explanation- In order to provide information to user, we use label that displays text that the user cannot directly change or edit.

(d) Getter method.

Explanation- Getter method begins with word get followed by the name of property. The getter methods simply return the value of the specific attribute or property.

(b) Setter method.

Explanation- Setter methods are mutator methods that change the value of a specific attribute or property of a component object to a specific value.

(d) actionPerformed().

Explanation- When the button is clicked, a call is made to the actionPerformed() method defined in the class of the listener object. An ActionEvent object is passed as a parameter to it actionPerformed().

(b)setFont().

Explanation- setFont() method can be used to set or change the font setting of any text.

(c) JTextComponent.

Explanation- All the swing components (JPanel, JLabel, JTextField, etc.) are derived from JComponent, and JComponent has following useful properties:

toolTipText

background

font

visible

opaque

(a) Jlabel.

Explanation- A label is an object of the class Jlabel.

(a) ActionPerformed().

Explanation- When the action event occurs, that object's actionPerformed method is invoked which implements ActionListener interface.

(a) when the field has focus and the enter key is hit.

Explanation- A TextField generates an ActionEvent when the user enters text and presses enter.

(c)SwingConstants.Center.

Explanation- Vertical Text position specifies the vertical position of the text relative to the icon. The default position is center.

(d) Trailing.

Explanation- Horizontal alignment specifies how the icon and text are placed horizontally on a button; default alignment is trailing.

(b) JCheckBox.

Explanation – JCheckBox class creates button that toggles between “on” and “off”.

(a) Title.

Explanation- Windows can be created using a Frame object; the class Frame provides various methods to control attributes of a window like title, width and height.

(b) It must declare and provide a method body for each method in the interface.

Explanation- When a class implements an interface it must declare and provide a method body for each method in the interface. All of the methods declared in an interface are implicitly abstract.

(d) action listener.

Explanation- We implement an action listener to define what should be done when an user performs certain operation.

(a) implement a WindowFocusListener.

Explanation- Focus events are fired whenever a component gains or loses the keyboard focus. To get focus for a window, implement a WindowFocusListener instance.

(a) setBorder method.

Explanation- Every JComponent can have one or more borders. To put a border around a JComponent, we use its setBorder method.

(b) panel.

Explanation- A panel is a type of container that is designed to hold a group of components so that they can be displayed on a frame.

(c) Dialog window

Explanation- A Dialog window is an independent subwindow meant to carry temporary notice apart from the main Swing Application Window.

(d) JButton class.

Explanation- Push Button are created through JButton class of Swing API. We can control the look and fell of the button.

(a) mnemonic property.

Explanation- To assign a keyboard access key to a command button, we need to set the mnemonic property of the button by simply typing the key in the box in front of mnemonic property in Properties window.

(b) Action Event.

Explanation- The most common event of push buttons (JButton) is Action Event, which is handled by ActionPerformed () method of event listener ActionListener.

(c) action event.

Explanation- An action event occurs, whenever an action is performed by the user.

(b) 0.

Explanation- By default, spacing for major and minor tick marks is zero. To see tick marks, we must explicitly set the spacing for either major or minor tick marks (or both) to a non-zero value and call the setPaintTicks(true) method.