JAVA GUI Interview Questions and Answers
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
Swing Interviews are getting tough these days as the technology grows faster. To get through the Swing interview one needs to update him/herself in a regular manner. Having said that, just before the interview, it is very important to have a quick glance of the reputed Swing questions and answers to make yourself comfortable during the interview process. This is where DoAnswers.com helps you in renewing yourself on Swing and various other technologies interview preparation.
31. 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.
32. What are difference between ActionErrors and ActionMessage?
ActionMessage: A class that encapsulates messages. Messages can be either global or they are specific to a particular bean property. Each individual message is described by an ActionMessage object, which contains a message key (to be looked up in an appropriate message resources database), and up to four placeholder arguments used for parametric substitution in the resulting message. ActionErrors: A class that encapsulates the error messages being reported by the validate() method of an ActionForm. Validation errors are either global to the entire ActionForm bean they are associated with, or they are specific to a particular bean property (and, therefore, a particular input field on the corresponding form).
33. What are Tag Libraries provided with Struts?
Struts provides a number of tag libraries that helps to create view components easily. These tag libraries are: a) Bean Tags: Bean Tags are used to access the beans and their properties. b) HTML Tags: HTML Tags provides tags for creating the view components like forms, buttons, etc.. c) Logic Tags: Logic Tags provides presentation logics that eliminate the need for scriptlets. d) Nested Tags: Nested Tags helps to work with the nested context.
34. What are the components of Struts?
Struts is based on the MVC design pattern. Struts components can be categories into Model, View and Controller. Model: Components like business logic / business processes and data are the part of Model. View: JSP, HTML etc. are part of View Controller: Action Servlet of Struts is part of Controller components which works as front controller to handle all the requests.
35. What are the core classes of the Struts Framework?
Core classes of Struts Framework are ActionForm, Action, ActionMapping, ActionForward, ActionServlet etc.
36. What are the difference between and ?
: This tag is used to output locale-specific text (from the properties files) from a MessageResources bundle. : This tag is used to output property values from a bean. is a commonly used tag which enables the programmers to easily present the data.
37. What are the disadvantages of Struts?
Struts is very robust framework and is being used extensively in the industry. But there are some disadvantages of the Struts: a) High Learning Curve Struts requires lot of efforts to learn and master it. For any small project less experience developers could spend more time on learning the Struts. b) Harder to learn Struts are harder to learn, benchmark and optimize.
38. What are the Java Foundation Classes?
The Java Foundation Classes (JFC) are a comprehensive set of GUI components and services which dramatically simplify the development and deployment of commercial-quality desktop and Internet/Intranet applications.
39. 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
40. What are the uses of tiles-def.xml file, resourcebundle.properties file, validation.xml file?
tiles-def.xml is is an xml file used to configure tiles with the struts application. You can define the layout / header / footer / body content for your View. See more at http://www.roseindia.net/struts/using-tiles-defs-xml.shtml. The resourcebundle.properties file is used to configure the message (error/ other messages) for the struts applications. The file validation.xml is used to declare sets of validations that should be applied to Form Beans. Fpr more information please visit http://www.roseindia.net/struts/address_struts_validator.shtml.
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