The document discusses event handling in Java. It lists several event listener interfaces (ItemListener, KeyListener, MouseMotionListener, MouseListener, TextListener, WindowListener) and their corresponding methods. It also lists some common event classes (ItemEvent, KeyEvent, MouseEvent, TextEvent, WindowEvent) and describes the types of events they represent. It provides details on key event constants in the KeyEvent class. The document is a lecture on event handling in Java, presented by instructor Tanzila Kehkashan.

1. CS3135/CS2135
Object Oriented Programming (Java)
BSCS-3 / MCS-3
Lecture # 12
Event Handling
Part-2

2. Event Handling
Event Listener Interfaces and their Methods Event classes and their methods
ItemListener
• void itemStateChanged (ItemEvent ie)
ItemEvent
Generated when a check box or a list item is clicked; also occurs
when a choice selection is made or a checkable menu is selected or
deselected.
• Object getSource()
KeyListener
• void keyPressed (KeyEvent ke)
• void keyReleased (KeyEvent ke)
• void keyTyped (KeyEvent ke)
KeyEvent
Generated when input is received from the keyboard.
• Object getSource()
MouseMotionListener
• void mouseDragged (MouseEvent me)
• void mouseMoved (MouseEvent me) //no buttons have
been pushed
MouseEvent
Generated when the mouse is dragged, moved, clicked, pressed, or
released; also generated when the mouse enters or exits a
component.
• Object getSource()
MouseListener
• void mouseClicked (MouseEvent me) //pressed or
released on a component
• void mousePressed(MouseEvent me)
• void mouseReleased (MouseEvent me)
MouseEvent
Same as above.
Instructor: Tanzila Kehkashan
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3. Event Handling
Event Listener Interfaces and their Methods Event classes and their methods
TextListener
• void textValueChanged (TextEvent te)
TextEvent
Generated when the value of a textarea or textfield is changed.
• Object getSource()
WindowListener
• void windowActivated (WindowEvent we)
• void windowClosed (WindowEvent we)
• void windowClosing (WindowEvent we)
• void windowDeactivated (WindowEvent we)
• void windowDeiconified (WindowEvent we) //from a
minimized to a normal state
• void windowIconified (WindowEvent we) //from a
normal to a minimized state
• void windowOpened (WindowEvent we)
WindowEvent
Generated when a window is activated, closed, deactivated,
deiconified, iconified, opened, or quit.
• Object getSource()
Instructor: Tanzila Kehkashan
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4. Event Handling
KeyEvent Key Constants
• KeyEvent.VK_0
• …
• KeyEvent.VK_9
• KeyEvent.VK_A
• ….
• KeyEvent.VK_Z
• KeyEvent.VK_SHIFT
• KeyEvent.VK_ALT
• KeyEvent.VK_AMPERSAND
• KeyEvent.VK_ASTERISK
• KeyEvent.VK_AT // @
• KeyEvent.VK_BACK_SLASH
• KeyEvent.VK_BACK_SPACE
• KeyEvent.VK_COLON
• KeyEvent.VK_COMMA
KeyEvent Key Constants
• KeyEvent.VK_DOWN
• KeyEvent.VK_UP
• KeyEvent.VK_LEFT
• KeyEvent.VK_RIGHT
• KeyEvent.VK_DOLLAR
• KeyEvent.VK_ENTER
• KeyEvent.VK_ESCAPE
• KeyEvent.VK_F1
• ….
• KeyEvent.VK_F12
• KeyEvent.VK_NUMPAD0
• KeyEvent.VK_NUMPAD9
• KeyEvent.VK_PLUS
• KeyEvent.VK_SUBTRACT
• KeyEvent.VK_MULTIPLY
KeyEvent Key Constants
• KeyEvent.VK_DIVIDE
• KeyEvent.VK_SPACE
• KeyEvent.VK_TAB
• KeyEvent.VK_WINDOWS
Instructor: Tanzila Kehkashan
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5. Instructor: Tanzila Kehkashan
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6. Instructor: Tanzila Kehkashan
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7. ASSIGNMENT
Q#1: Write a program which has two buttons. After each click, the program
determines how many times that specific button has been clicked.
Q#2: Make online admission form of student in three steps.
• In 1st frame, get personal bio-data of student,
• In 2nd frame, get academic record of student, and
• In 3rd frame, display all the information of student you collected in previous two
frames.
Instructor: Tanzila Kehkashan
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8. ASSIGNMENT
Write a program which consists of two drop down Lists and four buttons having
captions “>”, “>>”, “<”, “<<”. When user clicks on button “>”, selected item from
left list moves towards right list. Rest of three buttons work accordingly.
Instructor: Tanzila Kehkashan
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9. Instructor: Tanzila Kehkashan
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