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11 Questions

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Event Handling 7

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Questions and Answers

What are the three main components of a GUI application?

Buttons, menus, and event objects
Frames, panels, and event handlers
GUI components, event listeners, and application methods (correct)
Event adapters, GUI components, and application logic

What is the purpose of an event listener?

To listen for events from specific GUI components and respond to them (correct)
To create GUI components like buttons and menus
To perform useful work for the user in the application
To generate events when the user interacts with the GUI

What is an event in Java represented as?

A GUI component
A primitive data type
A method call
An object (correct)

What is the purpose of an adapter class in Java event handling?

To simplify the creation of event handlers by providing empty implementations of listener interface methods (A) Signup and view all the answers

When is a method in the listener object invoked?

When the user generates an event (B) Signup and view all the answers

What is the purpose of application methods in a GUI application?

To do useful work for the user in the program (B) Signup and view all the answers

What must a program do in order to respond to events in Java?

Create an event listener object for the type of event and register it with the GUI component. (C) Signup and view all the answers

What is the purpose of 'repaint()' in the given Java code snippet?

It triggers the repainting of the graphics component. (D) Signup and view all the answers

What is the significance of 'Point temp=new Point(); temp.x=x; temp.y=y;' in the Java code snippet?

It creates a new Point object with current mouse click coordinates. (B) Signup and view all the answers

What is the role of 'addMouseListener(new MouseAdapter(){...});' in the provided Java code snippet?

It associates a listener to detect mouse clicks and draw circles. (D) Signup and view all the answers

Why is it necessary to setBackground(Color.red); in the MouseClicks constructor?

To set the initial color of the GUI component. (A) Signup and view all the answers