Java Graphics User Interface Designer - Interview Questions 18 IMP interview questions

Java GUI designer interview questions

1.

What advantage do Java’s layout managers provide over traditional windowing systems? - Java uses layout managers to lay out components in a consistent manner across all windowing platforms. Since Java’s layout managers aren’t tied to absolute sizing and positioning, they are able to accomodate platform-specific differences among windowing systems.
2.

What is the difference between the paint() and repaint() methods? - The paint() method supports painting via a Graphics object. The repaint() method is used to cause paint() to be invoked by the AWT painting thread.

3.

How can the Checkbox class be used to create a radio button? - By associating Checkbox objects with a CheckboxGroup
4.

What is the difference between a Choice and a List? - 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.
5.

What interface is extended by AWT event listeners? - All AWT event listeners extend the java.util.EventListener interface.
6.

What is a layout manager? - A layout manager is an object that is used to organize components in a container
7.

Which Component subclass is used for drawing and painting? - Canvas
8.

What are the problems faced by Java programmers who dont use layout managers? - Without layout managers, Java programmers are faced with determining how their GUI will be displayed across multiple windowing systems and finding a common sizing and positioning that will work within the constraints imposed by each windowing system
9.

What is the difference between a Scrollbar and a ScrollPane? (Swing) - A Scrollbar is a Component, but not a Container. A ScrollPane is a Container. A ScrollPane handles its own events and performs its own scrolling.

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