Event handling in java: An event is the change in state of an object or source. The objects are buttons, textbox and so on. Event handling is the mechanism which controls an event and decides what should happen if an event occurs. That is if a button is clicked, its state will change to clicked. And this will decide by the event handling. Here click is the event happened to the button. The event handling will decide what should happen if a button is clicked. Event listener: Event handler is also known as event listener. The event listener generates response to the event on an object. The interfaces responsible for handling events are represent an Event listener. Java provides several Event listener interfaces. Every methods of event listener have a single argument. Some of the Event listener interfaces are given below, Control Description ActionListener This interface receives the action events. ItemListener This interface receives the item events. ComponentListener This interface receives component events Keylistener This interface receives key events. TextListener This interface receives text events. Windowlistener This interface receives the window events FocusListener This interface receives the focus events

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Answer 1

Question

Chapter 12.2, Problem 12.8CP

Program Plan Intro

Event handling in java:

An event is the change in state of an object or source. The objects are buttons, textbox and so on.

Event handling is the mechanism which controls an event and decides what should happen if an event occurs.

That is if a button is clicked, its state will change to clicked. And this will decide by the event handling. Here click is the event happened to the button. The event handling will decide what should happen if a button is clicked.

Event listener:

Event handler is also known as event listener. The event listener generates response to the event on an object.

The interfaces responsible for handling events are represent an Event listener.

Java provides several Event listener interfaces. Every methods of event listener have a single argument.

Some of the Event listener interfaces are given below,

Control Description
ActionListener This interface receives the action events.
ItemListener This interface receives the item events.
ComponentListener This interface receives component events
Keylistener This interface receives key events.
TextListener This interface receives text events.
Windowlistener This interface receives the window events
FocusListener This interface receives the focus events

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Answer 2

Question

Chapter 12.2, Problem 12.8CP

Program Plan Intro

Event handling in java:

An event is the change in state of an object or source. The objects are buttons, textbox and so on.

Event handling is the mechanism which controls an event and decides what should happen if an event occurs.

That is if a button is clicked, its state will change to clicked. And this will decide by the event handling. Here click is the event happened to the button. The event handling will decide what should happen if a button is clicked.

Event listener:

Event handler is also known as event listener. The event listener generates response to the event on an object.

The interfaces responsible for handling events are represent an Event listener.

Java provides several Event listener interfaces. Every methods of event listener have a single argument.

Some of the Event listener interfaces are given below,

Control Description
ActionListener This interface receives the action events.
ItemListener This interface receives the item events.
ComponentListener This interface receives component events
Keylistener This interface receives key events.
TextListener This interface receives text events.
Windowlistener This interface receives the window events
FocusListener This interface receives the focus events

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Answer 3

Question

Chapter 12.2, Problem 12.8CP

Program Plan Intro

Event handling in java:

An event is the change in state of an object or source. The objects are buttons, textbox and so on.

Event handling is the mechanism which controls an event and decides what should happen if an event occurs.

That is if a button is clicked, its state will change to clicked. And this will decide by the event handling. Here click is the event happened to the button. The event handling will decide what should happen if a button is clicked.

Event listener:

Event handler is also known as event listener. The event listener generates response to the event on an object.

The interfaces responsible for handling events are represent an Event listener.

Java provides several Event listener interfaces. Every methods of event listener have a single argument.

Some of the Event listener interfaces are given below,

Control Description
ActionListener This interface receives the action events.
ItemListener This interface receives the item events.
ComponentListener This interface receives component events
Keylistener This interface receives key events.
TextListener This interface receives text events.
Windowlistener This interface receives the window events
FocusListener This interface receives the focus events

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Answer 4

Question

Chapter 12.2, Problem 12.8CP

Program Plan Intro

Event handling in java:

An event is the change in state of an object or source. The objects are buttons, textbox and so on.

Event handling is the mechanism which controls an event and decides what should happen if an event occurs.

That is if a button is clicked, its state will change to clicked. And this will decide by the event handling. Here click is the event happened to the button. The event handling will decide what should happen if a button is clicked.

Event listener:

Event handler is also known as event listener. The event listener generates response to the event on an object.

The interfaces responsible for handling events are represent an Event listener.

Java provides several Event listener interfaces. Every methods of event listener have a single argument.

Some of the Event listener interfaces are given below,

Control Description
ActionListener This interface receives the action events.
ItemListener This interface receives the item events.
ComponentListener This interface receives component events
Keylistener This interface receives key events.
TextListener This interface receives text events.
Windowlistener This interface receives the window events
FocusListener This interface receives the focus events

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Answer 5

Chapter 12.2, Problem 12.8CP

Program Plan Intro

Event handling in java:

An event is the change in state of an object or source. The objects are buttons, textbox and so on.

Event handling is the mechanism which controls an event and decides what should happen if an event occurs.

That is if a button is clicked, its state will change to clicked. And this will decide by the event handling. Here click is the event happened to the button. The event handling will decide what should happen if a button is clicked.

Event listener:

Event handler is also known as event listener. The event listener generates response to the event on an object.

The interfaces responsible for handling events are represent an Event listener.

Java provides several Event listener interfaces. Every methods of event listener have a single argument.

Some of the Event listener interfaces are given below,

Control Description
ActionListener This interface receives the action events.
ItemListener This interface receives the item events.
ComponentListener This interface receives component events
Keylistener This interface receives key events.
TextListener This interface receives text events.
Windowlistener This interface receives the window events
FocusListener This interface receives the focus events

Answer 6

Chapter 12.2, Problem 12.8CP

Program Plan Intro

Event handling in java:

An event is the change in state of an object or source. The objects are buttons, textbox and so on.

Event handling is the mechanism which controls an event and decides what should happen if an event occurs.

That is if a button is clicked, its state will change to clicked. And this will decide by the event handling. Here click is the event happened to the button. The event handling will decide what should happen if a button is clicked.

Event listener:

Event handler is also known as event listener. The event listener generates response to the event on an object.

The interfaces responsible for handling events are represent an Event listener.

Java provides several Event listener interfaces. Every methods of event listener have a single argument.

Some of the Event listener interfaces are given below,

Control Description
ActionListener This interface receives the action events.
ItemListener This interface receives the item events.
ComponentListener This interface receives component events
Keylistener This interface receives key events.
TextListener This interface receives text events.
Windowlistener This interface receives the window events
FocusListener This interface receives the focus events

Answer 7

Chapter 12.2, Problem 12.8CP

Program Plan Intro

Event handling in java:

An event is the change in state of an object or source. The objects are buttons, textbox and so on.

Event handling is the mechanism which controls an event and decides what should happen if an event occurs.

That is if a button is clicked, its state will change to clicked. And this will decide by the event handling. Here click is the event happened to the button. The event handling will decide what should happen if a button is clicked.

Event listener:

Event handler is also known as event listener. The event listener generates response to the event on an object.

The interfaces responsible for handling events are represent an Event listener.

Java provides several Event listener interfaces. Every methods of event listener have a single argument.

Some of the Event listener interfaces are given below,

Control Description
ActionListener This interface receives the action events.
ItemListener This interface receives the item events.
ComponentListener This interface receives component events
Keylistener This interface receives key events.
TextListener This interface receives text events.
Windowlistener This interface receives the window events
FocusListener This interface receives the focus events

Answer 8

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Answer 9

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Answer 10

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Answer 11

Ch. 12.2 - Prob. 12.1CP Ch. 12.2 - Prob. 12.2CP Ch. 12.2 - Prob. 12.3CP Ch. 12.2 - Prob. 12.4CP Ch. 12.2 - Prob. 12.5CP Ch. 12.2 - Prob. 12.6CP Ch. 12.2 - If you are writing an event listener class for a...Ch. 12.2 - Prob. 12.8CP Ch. 12.2 - Prob. 12.9CP Ch. 12.3 - Prob. 12.10CP

Solution Summary: The author explains that event handling is the mechanism which controls an event and decides what should happen if it occurs. Java provides several Event listener interfaces.

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Chapter 12 Solutions

Control	Description
ActionListener	This interface receives the action events.
ItemListener	This interface receives the item events.
ComponentListener	This interface receives component events
Keylistener	This interface receives key events.
TextListener	This interface receives text events.
Windowlistener	This interface receives the window events
FocusListener	This interface receives the focus events