Sunday, July 30, 2017
shikshamitra
आपकी चाल के धीमा होने का फ़र्क तब तक नहीं पड़ता जब तक कि आप रुक न जाएं। ”कन्फ्यूशियस“सच में धनी व्यक्ति वह है जिसके बच्चे उसके हाथ खाली हों तब भी उसकी बाहों में दौड़ आएँ।
Thursday, October 9, 2008
Collection
Q: What is the Collections API?
A: The Collections API is a set of classes and interfaces that support operations on collections of objects.
[ Received from Prasanna Inamanamelluri] TOP
Q: What is the List interface?
A: The List interface provides support for ordered collections of objects.
[ Received from SPrasanna Inamanamelluri] TOP
Q: What is the Vector class?
A: The Vector class provides the capability to implement a growable array of objects.
[ Received from Prasanna Inamanamelluri] TOP
Q: What is an Iterator interface?
A: The Iterator interface is used to step through the elements of a Collection .
[ Received from Prasanna Inamanamelluri] TOP
Q: Which java.util classes and interfaces support event handling?
A: The EventObject class and the EventListener interface support event processing.
[ Received from Prasanna Inamanamelluri] TOP
Q: What is the GregorianCalendar class?
A: The GregorianCalendar provides support for traditional Western calendars
[ Received from Prasanna Inamanamelluri] TOP
Q: What is the Locale class?
A: The Locale class is used to tailor program output to the conventions of a particular geographic, political, or cultural region .
[ Received from Prasanna Inamanamelluri] TOP
Q: What is the SimpleTimeZone class?
A: The SimpleTimeZone class provides support for a Gregorian calendar .
[ Received from Prasanna Inamanamelluri] TOP
Q: What is the Map interface?
A: The Map interface replaces the JDK 1.1 Dictionary class and is used associate keys with values.
[ Received from Prasanna Inamanamelluri] TOP
Q: What is the highest-level event class of the event-delegation model?
A: The java.util.EventObject class is the highest-level class in the event-delegation class hierarchy.
[ Received from Prasanna Inamanamelluri] TOP
Q: What is the Collection interface?
A: The Collection interface provides support for the implementation of a mathematical bag - an unordered collection of objects that may contain duplicates.
[ Received from Prasanna Inamanamelluri] TOP
Q: What is the Set interface?
A: The Set interface provides methods for accessing the elements of a finite mathematical set. Sets do not allow duplicate elements.
[ Received from Prasanna Inamanamelluri] TOP
Q: What is the typical use of Hashtable?
A: Whenever a program wants to store a key value pair, one can use Hashtable.
[ Received from Sandesh Sadhale] TOP
Q: I am trying to store an object using a key in a Hashtable. And some other object already exists in that location, then what will happen? The existing object will be overwritten? Or the new object will be stored elsewhere?
A: The existing object will be overwritten and thus it will be lost.
[ Received from Sandesh Sadhale] TOP
Q: What is the difference between the size and capacity of a Vector?
A: The size is the number of elements actually stored in the vector, while capacity is the maximum number of elements it can store at a given instance of time.
[ Received from Sandesh Sadhale] TOP
Q: Can a vector contain heterogenous objects?
A: Yes a Vector can contain heterogenous objects. Because a Vector stores everything in terms of Object.
[ Received from Sandesh Sadhale] TOP
Q: Can a ArrayList contain heterogenous objects?
A: Yes a ArrayList can contain heterogenous objects. Because a ArrayList stores everything in terms of Object.
[ Received from Sandesh Sadhale] TOP
Q: What is an enumeration?
A: An enumeration is an interface containing methods for accessing the underlying data structure from which the enumeration is obtained. It is a construct which collection classes return when you request a collection of all the objects stored in the collection. It allows sequential access to all the elements stored in the collection.
[ Received from Sandesh Sadhale] TOP
Q: Considering the basic properties of Vector and ArrayList, where will you use Vector and where will you use ArrayList?
A: The basic difference between a Vector and an ArrayList is that, vector is synchronized while ArrayList is not. Thus whenever there is a possibility of multiple threads accessing the same instance, one should use Vector. While if not multiple threads are going to access the same instance then use ArrayList. Non synchronized data structure will give better performance than the synchronized one.
[ Received from Sandesh Sadhale] TOP
Q: Can a vector contain heterogenous objects?
A: Yes a Vector can contain heterogenous objects. Because a Vector stores everything in terms of Object.
[ Received from Sandesh Sadhale] TOP
A: The Collections API is a set of classes and interfaces that support operations on collections of objects.
[ Received from Prasanna Inamanamelluri] TOP
Q: What is the List interface?
A: The List interface provides support for ordered collections of objects.
[ Received from SPrasanna Inamanamelluri] TOP
Q: What is the Vector class?
A: The Vector class provides the capability to implement a growable array of objects.
[ Received from Prasanna Inamanamelluri] TOP
Q: What is an Iterator interface?
A: The Iterator interface is used to step through the elements of a Collection .
[ Received from Prasanna Inamanamelluri] TOP
Q: Which java.util classes and interfaces support event handling?
A: The EventObject class and the EventListener interface support event processing.
[ Received from Prasanna Inamanamelluri] TOP
Q: What is the GregorianCalendar class?
A: The GregorianCalendar provides support for traditional Western calendars
[ Received from Prasanna Inamanamelluri] TOP
Q: What is the Locale class?
A: The Locale class is used to tailor program output to the conventions of a particular geographic, political, or cultural region .
[ Received from Prasanna Inamanamelluri] TOP
Q: What is the SimpleTimeZone class?
A: The SimpleTimeZone class provides support for a Gregorian calendar .
[ Received from Prasanna Inamanamelluri] TOP
Q: What is the Map interface?
A: The Map interface replaces the JDK 1.1 Dictionary class and is used associate keys with values.
[ Received from Prasanna Inamanamelluri] TOP
Q: What is the highest-level event class of the event-delegation model?
A: The java.util.EventObject class is the highest-level class in the event-delegation class hierarchy.
[ Received from Prasanna Inamanamelluri] TOP
Q: What is the Collection interface?
A: The Collection interface provides support for the implementation of a mathematical bag - an unordered collection of objects that may contain duplicates.
[ Received from Prasanna Inamanamelluri] TOP
Q: What is the Set interface?
A: The Set interface provides methods for accessing the elements of a finite mathematical set. Sets do not allow duplicate elements.
[ Received from Prasanna Inamanamelluri] TOP
Q: What is the typical use of Hashtable?
A: Whenever a program wants to store a key value pair, one can use Hashtable.
[ Received from Sandesh Sadhale] TOP
Q: I am trying to store an object using a key in a Hashtable. And some other object already exists in that location, then what will happen? The existing object will be overwritten? Or the new object will be stored elsewhere?
A: The existing object will be overwritten and thus it will be lost.
[ Received from Sandesh Sadhale] TOP
Q: What is the difference between the size and capacity of a Vector?
A: The size is the number of elements actually stored in the vector, while capacity is the maximum number of elements it can store at a given instance of time.
[ Received from Sandesh Sadhale] TOP
Q: Can a vector contain heterogenous objects?
A: Yes a Vector can contain heterogenous objects. Because a Vector stores everything in terms of Object.
[ Received from Sandesh Sadhale] TOP
Q: Can a ArrayList contain heterogenous objects?
A: Yes a ArrayList can contain heterogenous objects. Because a ArrayList stores everything in terms of Object.
[ Received from Sandesh Sadhale] TOP
Q: What is an enumeration?
A: An enumeration is an interface containing methods for accessing the underlying data structure from which the enumeration is obtained. It is a construct which collection classes return when you request a collection of all the objects stored in the collection. It allows sequential access to all the elements stored in the collection.
[ Received from Sandesh Sadhale] TOP
Q: Considering the basic properties of Vector and ArrayList, where will you use Vector and where will you use ArrayList?
A: The basic difference between a Vector and an ArrayList is that, vector is synchronized while ArrayList is not. Thus whenever there is a possibility of multiple threads accessing the same instance, one should use Vector. While if not multiple threads are going to access the same instance then use ArrayList. Non synchronized data structure will give better performance than the synchronized one.
[ Received from Sandesh Sadhale] TOP
Q: Can a vector contain heterogenous objects?
A: Yes a Vector can contain heterogenous objects. Because a Vector stores everything in terms of Object.
[ Received from Sandesh Sadhale] TOP
STRUTS question
Q: What is Struts?
A: The core of the Struts framework is a flexible control layer based on standard technologies like Java Servlets, JavaBeans, ResourceBundles, and XML, as well as various Jakarta Commons packages. Struts encourages application architectures based on the Model 2 approach, a variation of the classic Model-View-Controller (MVC) design paradigm.
Struts provides its own Controller component and integrates with other technologies to provide the Model and the View. For the Model, Struts can interact with standard data access technologies, like JDBC and EJB, as well as most any third-party packages, like Hibernate, iBATIS, or Object Relational Bridge. For the View, Struts works well with JavaServer Pages, including JSTL and JSF, as well as Velocity Templates, XSLT, and other presentation systems.
The Struts framework provides the invisible underpinnings every professional web application needs to survive. Struts helps you create an extensible development environment for your application, based on published standards and proven design patterns.
[ Received from Ramakrishna Potluri ] TOP
Q: What is Jakarta Struts Framework?
A: Jakarta Struts is open source implementation of MVC (Model-View-Controller) pattern for the development of web based applications. Jakarta Struts is robust architecture and can be used for the development of application of any size. Struts framework makes it much easier to design scalable, reliable Web applications with Java.
[ Received from Dhiraj Sharma] TOP
Q: What is ActionServlet?
A: The class org.apache.struts.action.ActionServlet is the called the ActionServlet. In the the Jakarta Struts Framework this class plays the role of controller. All the requests to the server goes through the controller. Controller is responsible for handling all the requests.
[ Received from Dhiraj Sharma] TOP
Q: How you will make available any Message Resources Definitions file to the Struts Framework Environment?
A: T Message Resources Definitions file are simple .properties files and these files contains the messages that can be used in the struts project. Message Resources Definitions files can be added to the struts-config.xml file through
Example:
[ Received from Dhiraj Sharma] TOP
Q: What is Action Class?
A: The Action Class is part of the Model and is a wrapper around the business logic. The purpose of Action Class is to translate the HttpServletRequest to the business logic. To use the Action, we need to Subclass and overwrite the execute() method. In the Action Class all the database/business processing are done. It is advisable to perform all the database related stuffs in the Action Class. The ActionServlet (commad) passes the parameterized class to Action Form using the execute() method. The return type of the execute method is ActionForward which is used by the Struts Framework to forward the request to the file as per the value of the returned ActionForward object.
[ Received from Dhiraj Sharma] TOP
Q: What is ActionForm?
A: An ActionForm is a JavaBean that extends org.apache.struts.action.ActionForm. ActionForm maintains the session state for web application and the ActionForm object is automatically populated on the server side with data entered from a form on the client side.
[ Received from Dhiraj Sharma] TOP
Q: What is Struts Validator Framework?
A: Struts Framework provides the functionality to validate the form data. It can be use to validate the data on the users browser as well as on the server side. Struts Framework emits the java scripts and it can be used validate the form data on the client browser. Server side validation of form can be accomplished by sub classing your From Bean with DynaValidatorForm class.
The Validator framework was developed by David Winterfeldt as third-party add-on to Struts. Now the Validator framework is a part of Jakarta Commons project and it can be used with or without Struts. The Validator framework comes integrated with the Struts Framework and can be used without doing any extra settings.
[ Received from Dhiraj Sharma] TOP
Q: Give the Details of XML files used in Validator Framework?
A: 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.
[ Received from Dhiraj Sharma] TOP
Q: How you will display validation fail errors on jsp page?
A: Following tag displays all the errors:
[ Received from Dhiraj Sharma] TOP
Q: How you will enable front-end validation based on the xml in validation.xml?
A: The tag to allow front-end validation based on the xml in validation.xml. For example the code: when added in the jsp file generates the client site validation script.
[ Received from Dhiraj Sharma] TOP
Q: How to get data from the velocity page in a action class?
A: We can get the values in the action classes by using data.getParameter(\"variable name defined in the velocity page\");
A: The core of the Struts framework is a flexible control layer based on standard technologies like Java Servlets, JavaBeans, ResourceBundles, and XML, as well as various Jakarta Commons packages. Struts encourages application architectures based on the Model 2 approach, a variation of the classic Model-View-Controller (MVC) design paradigm.
Struts provides its own Controller component and integrates with other technologies to provide the Model and the View. For the Model, Struts can interact with standard data access technologies, like JDBC and EJB, as well as most any third-party packages, like Hibernate, iBATIS, or Object Relational Bridge. For the View, Struts works well with JavaServer Pages, including JSTL and JSF, as well as Velocity Templates, XSLT, and other presentation systems.
The Struts framework provides the invisible underpinnings every professional web application needs to survive. Struts helps you create an extensible development environment for your application, based on published standards and proven design patterns.
[ Received from Ramakrishna Potluri ] TOP
Q: What is Jakarta Struts Framework?
A: Jakarta Struts is open source implementation of MVC (Model-View-Controller) pattern for the development of web based applications. Jakarta Struts is robust architecture and can be used for the development of application of any size. Struts framework makes it much easier to design scalable, reliable Web applications with Java.
[ Received from Dhiraj Sharma] TOP
Q: What is ActionServlet?
A: The class org.apache.struts.action.ActionServlet is the called the ActionServlet. In the the Jakarta Struts Framework this class plays the role of controller. All the requests to the server goes through the controller. Controller is responsible for handling all the requests.
[ Received from Dhiraj Sharma] TOP
Q: How you will make available any Message Resources Definitions file to the Struts Framework Environment?
A: T Message Resources Definitions file are simple .properties files and these files contains the messages that can be used in the struts project. Message Resources Definitions files can be added to the struts-config.xml file through
Example:
[ Received from Dhiraj Sharma] TOP
Q: What is Action Class?
A: The Action Class is part of the Model and is a wrapper around the business logic. The purpose of Action Class is to translate the HttpServletRequest to the business logic. To use the Action, we need to Subclass and overwrite the execute() method. In the Action Class all the database/business processing are done. It is advisable to perform all the database related stuffs in the Action Class. The ActionServlet (commad) passes the parameterized class to Action Form using the execute() method. The return type of the execute method is ActionForward which is used by the Struts Framework to forward the request to the file as per the value of the returned ActionForward object.
[ Received from Dhiraj Sharma] TOP
Q: What is ActionForm?
A: An ActionForm is a JavaBean that extends org.apache.struts.action.ActionForm. ActionForm maintains the session state for web application and the ActionForm object is automatically populated on the server side with data entered from a form on the client side.
[ Received from Dhiraj Sharma] TOP
Q: What is Struts Validator Framework?
A: Struts Framework provides the functionality to validate the form data. It can be use to validate the data on the users browser as well as on the server side. Struts Framework emits the java scripts and it can be used validate the form data on the client browser. Server side validation of form can be accomplished by sub classing your From Bean with DynaValidatorForm class.
The Validator framework was developed by David Winterfeldt as third-party add-on to Struts. Now the Validator framework is a part of Jakarta Commons project and it can be used with or without Struts. The Validator framework comes integrated with the Struts Framework and can be used without doing any extra settings.
[ Received from Dhiraj Sharma] TOP
Q: Give the Details of XML files used in Validator Framework?
A: 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.
[ Received from Dhiraj Sharma] TOP
Q: How you will display validation fail errors on jsp page?
A: Following tag displays all the errors:
[ Received from Dhiraj Sharma] TOP
Q: How you will enable front-end validation based on the xml in validation.xml?
A: The
[ Received from Dhiraj Sharma] TOP
Q: How to get data from the velocity page in a action class?
A: We can get the values in the action classes by using data.getParameter(\"variable name defined in the velocity page\");
Monday, May 19, 2008
lodhi samaj
The Lodhi (or Lodha, Lodh) is a community of agriculturalists, found in India. There are many in Madhya Pradesh, to where they had emigrated from Uttar Pradesh
Principle
As the blood circulation kept alive of human body.
Similarly information circulating kept alive every organization ।
Similarly information circulating kept alive every organization ।
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