| Awt Swing Interview Questions and Answers |
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| 1 |
what is the difference between a Choice and a List? |
| Ans: |
A Choice is displayed in a compact form that requires you to pull it down to see the list of available choices. Only one item may be selected from a Choice. A List may be displayed in such a way that several List items are visible. A List supports the selection of one or more List items. |
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| 2 |
what interface is extended by AWT event listeners? |
| Ans: |
All AWT event listeners extend the java.util.EventListener interface. |
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| 3 |
what is a layout manager? |
| Ans: |
A layout manager is an object that is used to organize components in a container. |
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| 4 |
Which Component subclass is used for drawing and painting? |
| Ans: |
Canvas |
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| 5 |
what is the difference between a Scrollbar and a Scroll Pane? |
| Ans: |
A Scrollbar is a Component, but not a Container. A Scroll Pane is a Container. A Scroll Pane handles its own events and performs its own scrolling. |
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| 6 |
Which Swing methods are thread-safe? |
| Ans: |
The only thread-safe methods are repaint (), revalidate (), and invalidate () |
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| 7 |
which containers use a border Layout as their default layout? |
| Ans: |
The Window, Frame and Dialog classes use a border layout as their default layout |
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| 8 |
what is the preferred size of a component? |
| Ans: |
The preferred size of a component is the minimum component size that will allow the component to display normally |
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| 9 |
which containers use a Flow Layout as their default layout? |
| Ans: |
The Panel and Applet classes use the Flow Layout as their default layout |
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| 10 |
what is the immediate super class of the Applet class? |
| Ans: |
Panel |
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| 11 |
Name three Component subclasses that support painting |
| Ans: |
The Canvas, Frame, Panel, and Applet classes support painting |
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| 12 |
what is the immediate super class of the Dialog class? |
| Ans: |
Window |
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| 13 |
what is clipping? |
| Ans: |
Clipping is the process of confining paint operations to a limited area or shape. |
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| 14 |
what is the difference between a Menu Item and a Check box MenuItem? |
| Ans: |
The Checkbox Menu Item class extends the MenuItem class to support a menu item that may be checked or unchecked. |
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| 15 |
what class is the top of the AWT event hierarchy? |
| Ans: |
The java.awt.AWTEvent class is the highest-level class in the AWT event-class hierarchy |
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| 16 |
In which package are most of the AWT events that support the event-delegation model defined? |
| Ans: |
Most of the AWT-related events of the event-delegation model are defined in the java.awt.event package. The AWTEvent class is defined in the java.awt package. |
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| 17 |
which class is the immediate super class of the Menu Component class |
| Ans: |
Object |
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| 18 |
which containers may have a Menu Bar? |
| Ans: |
Frame |
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| 19 |
what is the relationship between the Canvas class and the Graphics class? |
| Ans: |
A Canvas object provides access to a Graphics object via its paint () method. |
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| 20 |
How are the elements of a Border Layout organized? |
| Ans: |
The elements of a Border Layout are organized at the borders (North, South, East, and West) and the center of a container. |
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