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
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1. Are other native look and feel designs available?
Yes. The Java 2 Platform, SE, provides pluggable look-and-feel implementations for the Windows and UNIX platforms. Other look and feels are available, as well.
2. Are the Java Foundation Classes easy to use?
Not being a port from a different environment, the Java Foundation Classes conform 100% with Java's object and component model. Developers find JFC a very easy and natural extension to the Java Platform.
3. Are the Java Foundation Classes supported by major Java tools vendors?
Absolutely; we have close relationships with all the major Java development environment vendors. As part of the Java Platform, JFC is available in all major Java development tools. A listing of tool providers can be found on the http://java.sun.com/beans site under the product directory.
4. Can I setup Apache Struts to use multiple configuration files?
Yes Struts can use multiple configuration files. Here is the configuration example: banking org.apache.struts.action.ActionServlet config /WEB-INF/struts-config.xml, /WEB-INF/struts-authentication.xml, /WEB-INF/struts-help.xml 1
5. Can we Serialize static variable?
Serialization is the process of converting a set of object instances that contain references to each other into a linear stream of bytes, which can then be sent through a socket, stored to a file, or simply manipulated as a stream of data. Serialization is the mechanism used by RMI to pass objects between JVMs, either as arguments in a method invocation from a client to a server or as return values from a method invocation. In the first section of this book, There are three exceptions in which serialization doesnot necessarily read and write to the stream. These are 1. Serialization ignores static fields, because they are not part of any particular object's state. 2. Base class fields are only handled if the base class itself is serializable. 3. Transient fields. There are four basic things you must do when you are making a class serializable. They are: Implement the Serializable interface. Make sure that instance-level, locally defined state is serialized properly. Make sure that superclass state is serialized properly. Override equals( )and hashCode( ). it is possible to have control over serialization process. The class should implement Externalizable interface. This interface contains two methods namely readExternal and writeExternal. You should implement these methods and write the logic for customizing the serialization process .... (Source: http://www.oreilly.com/catalog/javarmi/chapter/ch10.html)
6. Defines an object that receives requests from the client and sends them to any resource (such as a servlet, HTML file, or JSP file) on the server. The servlet container creates the RequestDispatcher object, which is used as a wrapper around a server resou
This interface is intended to wrap servlets, but a servlet container can create RequestDispatcher objects to wrap any type of resource. getRequestDispatcher public RequestDispatcher getRequestDispatcher(java.lang.String path) Returns a RequestDispatcher object that acts as a wrapper for the resource located at the given path. A RequestDispatcher object can be used to forward a request to the resource or to include the resource in a response. The resource can be dynamic or static. The pathname must begin with a "/" and is interpreted as relative to the current context root. Use getContext to obtain a RequestDispatcher for resources in foreign contexts. This method returns null if the ServletContext cannot return a RequestDispatcher. Parameters: path - a String specifying the pathname to the resource Returns: a RequestDispatcher object that acts as a wrapper for the resource at the specified path See Also: RequestDispatcher, getContext(java.lang.String) getNamedDispatcher public RequestDispatcher getNamedDispatcher(java.lang.String name) Returns a RequestDispatcher object that acts as a wrapper for the named servlet. Servlets (and JSP pages also) may be given names via server administration or via a web application deployment descriptor. A servlet instance can determine its name using ServletConfig.getServletName(). This method returns null if the ServletContext cannot return a RequestDispatcher for any reason. Parameters: name - a String specifying the name of a servlet to wrap Returns: a RequestDispatcher object that acts as a wrapper for the named servlet See Also: RequestDispatcher, getContext(java.lang.String), ServletConfig.getServletName()
7. Do the Java Foundation Classes run better on one platform than others?
Because the Java Foundation Classes are designed to be truly cross-platform, they run equally well on all Java Compatible Platforms.
8. Give the Details of XML files used in Validator Framework?
The Validator Framework uses two XML configuration files validator-rules.xml and validation.xml. The validator-rules.xml defines the standard validation routines, these are reusable and used in validation.xml. to define the form specific validations. The validation.xml defines the validations applied to a form bean.
9. How are the elements of a BorderLayout organized?
The elements of a BorderLayout are organized at the borders (North, South, East, and West) and the center of a container.
10. How are the elements of a CardLayout organized?
The elements of a CardLayout are stacked, one on top of the other, like a deck of cards.
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