| 1 |
Q |
What is JFC? |
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A |
JFC stands for Java Foundation Classes.
The Java Foundation Classes (JFC) are a set of Java class
libraries provided as part of Java 2 Platform, Standard
Edition (J2SE) to support building graphics user interface
(GUI) and graphics functionality for client applications
that will run on popular platforms such as Microsoft
Windows, Linux, and Mac OSX. |
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| 2 |
Q |
What is AWT? |
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A |
AWT stands for Abstract Window Toolkit.
AWT enables programmers to develop Java applications with
GUI components, such as windows, and buttons. The Java
Virtual Machine (JVM) is responsible for translating the AWT
calls into the appropriate calls to the host operating
system. |
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| 3 |
Q |
What are the differences
between Swing and AWT? |
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A |
AWT is heavy-weight components, but Swing is
light-weight components. AWT is OS dependent because it uses
native components, But Swing components are OS independent.
We can change the look and feel in Swing which is not
possible in AWT. Swing takes less memory compared to AWT.
For drawing AWT uses screen rendering where Swing uses
double buffering. |
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| 4 |
Q |
What are heavyweight components
? |
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A |
A heavyweight component is one that is associated
with its own native screen resource (commonly known as a
peer). |
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| 5 |
Q |
What is lightweight component? |
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A |
A lightweight component is one that "borrows" the screen
resource of an ancestor (which means it has no native
resource of its own -- so it's "lighter"). |
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| 6 |
Q |
What is double
buffering ? |
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A |
Double buffering is the process of use of two
buffers rather than one to temporarily hold data being moved
to and from an I/O device. Double buffering increases data
transfer speed because one buffer can be filled while the
other is being emptied. |
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| 7 |
Q |
What is an event? |
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A |
Changing the state of an object is called an event. |
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| 8 |
Q |
What is an event handler ? |
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A |
An event handler is a part of a computer program created
to tell the program how to act in response to a specific
event. |
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| 9 |
Q |
What is a layout manager? |
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A |
A layout manager is an object that is used to organize
components in a container. |
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| 10 |
Q |
What is clipping? |
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A |
Clipping is the process of confining paint
operations to a limited area or shape. |
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| 11 |
Q |
Which containers use a border Layout
as their default layout? |
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A |
The window, Frame and Dialog classes use a border layout
as their default layout. |
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| 12 |
Q |
What is the preferred size of a
component? |
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A |
The preferred size of a component is the minimum
component size that will allow the component to display
normally. |
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| 13 |
Q |
What method is used to specify a
container's layout? |
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A |
The setLayout() method is used to specify a container's
layout. |
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| 14 |
Q |
Which containers use a FlowLayout as
their default layout? |
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A |
The Panel and Applet classes use the FlowLayout as their
default layout. |
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| 15 |
Q |
Which method of the Component class
is used to set the position and size of a component? |
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A |
setBounds |
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