Transcript Programlama ve Nesneler

Object Oriented Programming
Ders 11: Interfaces
Mustafa Emre İlal
[email protected]
Recap
• Assignment 9
• The Collections Framework
Today
• Assignment 10
• Interfaces – Swing classes
• Thinking in Java – Chapter 14
User Interface
• Graphical User Interface [GUI]
• "gooey"
• Every operating system’s (platform) windowing
mechanisms differ vastly
• For each platform the GUI code needs to be
redesigned
• Java interface runs on the Java platform and is
developed only once
java.awt.* and javax.swing.*
• Java’s GUI classes are in these two packages
• AWT (Abstract Windowing Toolkit) – old; were
not totally platform independent
– Button
– TextField
• Swing (part of JFC) – recommended; platform
independent, provides more options
– JButton
– JTextField
Main windows
• 3 often used windows (top-level containers)
JFrame
JDialog
JApplet
Containers
JScrollPane
JPanel
JToolBar
JSplitPane
JTabbedPane
Controls (widgets)
JSpinner
JSlider
JTextField
JMenu
JComboBox
JList
JButton
JRadioButton
JCheckBox
Information
JToolTip
JLabel
JProgressBar
Complex Classes
JColorChooser
JFileChooser
JTree
JTable
Windows
• Components are placed in containers which are in
turn placed inside other containers to form a treelike hierarchy
Layout Manager
• When components are placed into a containers,
where they appear is controlled by rules that are
handled by LayoutManager s
• Each container will have a LayoutManager.
• Various LayoutManagers:
–
–
–
–
FlowLayout
GridLayout
BorderLayout
etc.
Example Layouts
Event
• User interacts with our application through the
operating system interface
• Keyboard and mouse is tracked by the OS.
Movement of the mouse, click on a button,
pressing on a key are all “events”
• Applications are notified by the OS about events
that occur over their windows. Making sense out
of events (user requests) and responding to them
are the applications’ responsibility.
Event
• The events that are sent by the OS to the Java apps are
represented by either an “awt event” or a “swing event”
and are associated with the component they occur on.
AWTEvent
ActionEvent
ComponentEvent
WindowEvent
MouseEvent
MouseMotionEvent
FocusEvent
KeyEvent
ContainerEvent
HierarchyEvent
InputMethodEvent
ItemEvent
vs
Swing Event
ListSelectionListener
MenuListener
HyperlinkListener
TreeSelectionListener
DocumentEvent
vs
EventListener
• When an event takes place, starting with the
component it takes place on, all the elements in
the GUI hierarchy above the source component
gets notified
• These components in turn notify all the
EventListeners that have registered with them for
the type of event that has occured
• EventListeners need to be written by you and have
to implement the proper EventListener interface.
Example – EventListener
public class MyClass implements ActionListener {
...
public void actionPerformed(ActionEvent e) {
...
}
}
MyClass mc = new MyClass();
someComponent.addActionListener(mc);
Assignment 12a
•
Write an application that reads a text file and
displays the number of vowels and consonents on
a GUI.
Read
TextFile.txt
785
5543
Reading complete
Vowels
Consonents
Assignment 12b
• Develop a GUI for the application you have
written for assignment 11 :
– Whenever the “Create Shapes” button is pressed, create
10 random shapes and display them on the canvas. (pay
attention to shape sizes)
Create Shapes
Next Week
• Final exam?
• Review
• Projects...