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RunButtonDemo
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Example 9.2: Using Labels
RunLabelDemo
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result of the arithmetic operation between
Number 1 and Number 2.
MenuDemo
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Creating Multiple Windows
The following slides show step-by-step how to
create an additional window from an
application or applet.
Step 1: Create a subclass of JFrame (called a
SubFrame) that tells the new window what
to do. For example, all the GUI application
programs extend JFrame and are subclasses
of JFrame.
Creating Additional Windows, Step 1
Creating Additional Windows, Step 2
Step 2: Create an instance of SubFrame in the
application or applet.
Example:
SubFrame subFrame = new
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Creating Additional Windows, Step 3
Step 3: Create a JButton for activating the
subFrame.
add(new JButton("Activate SubFrame"));
Creating Additional Windows, Step 4
Step 4: Override the actionPerformed()
method as follows:
public actionPerformed(ActionEvent e)
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String actionCommand = e.getActionCommand();
if (e.target instanceof Button)
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}
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Example 9.12 Creating Multiple
Windows
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with a text area in the scroll pane,
and a button named "Show
Histogram." When the user clicks
the button, a new window appears
that displays a histogram to show
the occurrence of the letters in the
text area.
RunMultipleWindowsDemo
Histogram
JScrollBar
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the user to select from a range of
values. The scrollbar appears in two
styles: horizontal and vertical.
Example 9.13: Using Scrollbars
RunScrollBarDemo
Scroll Bar Properties
Bubble
Unit increment
Block decrement Block increment
Minimal value Maximal value
Unit decrement
JScrollPane
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supports automatically scrolling
without coding.
Example 9.14: Using Scroll Panes
RunScrollPaneDemo
Scroll Pane Structures
Column headerCorner
Component
Row header
JViewport
Scrollable Component
Horizontal scroll bars
Vertical scroll bars
Corner
Component
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JTabbedPane
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mutually exclusive tabs for
accessing multiple components.
Example 9.15: Using Tabbed Panes
RunTabbedPaneDemo
