Interfaces, like classes, define a set of properties, methods, and events. But unlike classes, interfaces do not provide implementation. They are implemented by classes, and defined as separate entities from classes. Even though class inheritance allows your classes to inherit implementation from a base class, it also forces you to make most of your design decisions when the class is first published. See similar questions...

No, not quite. An abstract class in C++ cannot be instantiated, but it can (and often does) contain implementation code and/or data members. A C# interface cannot contain any implementation code or data members - it is simply a group of method names & signatures. A C# interface is more like a COM interface than a C++ abstract class. See similar questions...

interface contains methods that must be abstract; abstract class may contain concrete methods. interface contains variables that must be static and final; abstract class may contain non-final and final variables. members in an interface are public by default, abstract class may contain non-public members. interface is used to "implements"; whereas abstract class is used to "extends". See similar questions...

Latest Answer: hi, Diff b/w abstract class and interface are.. Abstract class can have concrete me... Latest Answer: See the base class(super class) of all classes is Object class.Other wise when u creat a class ,and ... See similar questions...

The principal difference is that an abstract class is used when you have a type/subtype relationship. An interface does not imply a type/subtype hierarchy; it merely forces a class to have some methods with a given signature. That allows some other code to rely on being able to call those methods. You want to subclass abstract classes when you are making subtypes that define the abstract behavior. The subclass should have a "kind of" relationship to the superclass. See similar questions...

Interfaces provide a form of multiple inheritance. A class can extend only one other class. Interfaces are limited to public methods and constants with no implementation. Abstract classes can have a partial implementation, protected parts, static methods, etc. A Class may implement several interfaces. But in case of abstract class, a class may extend only one abstract class. Interfaces are slow as it requires extra indirection to to find corresponding method in in the actual class. See similar questions...

It is only possible to call a concrete method of an abstract class when the method is instantiated through a concrete subclass. The method must also have a public or package visibility modifier that makes it accessible to the calling class. When you call the method on the subclass, it implicitly invokes superclass implementation, as in the example below. See similar questions...

A patient has a known BBT diagnosed after 1/01/04 and it is not treated. After time, the patient is diagnosed with a malignant brain tumor in the same site. Response: Report as two primaries one benign (sequence number 60) and one malignant (sequence number 00). Once a tumor transforms from benign to malignant, another abstract for the malignant tumor is prepared. See similar questions...

The GenericServlet is an abstract class that is extended by HttpServlet to provide HTTP protocol-specific methods. Java application developers normally extend the HttpServlet because it implements all the HTTP features necessary to create a Web application. The GenericServlet does not include protocol-specific methods for handling request parameters, cookies, sessions and setting response headers. See similar questions...

A class containing abstract method is called Abstract class. An Abstract class can't be instantiated. See similar questions...

abstract value is a mathematical abstraction of some bits that might exist in your computer. (It's an abstraction in the same sense that a road map of the United States is an abstraction of the geography and roads of the United States.) In a Larch BISL's model of your computer, each variable contains an abstract value. See similar questions...

Yes; but it is strictly a testing sandbox environment and you should not make any restricted data available on it. The services hosted can be discovered using the DiscoveryClient aimed at http://training03.cagrid.org:6080/wsrf/services/DefaultIndexService. The (secure) services in this grid run with certificates not trusted by the production release. The list of core services can be found here. See similar questions...

The MVC design pattern is very simple to understand but much more difficult to live with. You just need this little bit of Business Logic in the View logic or you need just that little bit of View logic in the Business tier and pretty soon you have a real mess. Making ActionForm a class takes advantage of the single inheritance restriction of Java to it makes it more difficult for people to do things that they should not do. See similar questions...

It must provide all of the methods in the interface and identify the interface in its implements clause. See similar questions...

No. Since abstract classes don't have constructors it would be a syntax error to call super(). Just implement the constructor of the subclass as if it does not have a parent class. See similar questions...

The ResourceBundle class is used to store locale-specific resources that can be loaded by a program to tailor the program's appearance to the particular locale in which it is being run. The exception propagates up to the next higher level try-catch statement (if any) or results in the program's termination. See similar questions...

The scenario is a set of several tasks united for sequential execution. If you wish to add a scenario to the task list, you should have at least one task already added to the program. Service Center for MySQL allows you to add a new, edit, change scheduler options, execute, and delete a scenario See similar questions...

A scenario is the Trainz version of Microsoft Train Simulator's "activity." Both are a set of tasks for you, the engineer, to complete. In use, the instructions are displayable while driving. It's possible to create your own activity or scenario; both are somewhat involved. MSTS has a built-in activity function, whereas Trainz requires some knowledge of scripting. The TrainzProRoutes group has created a utility that aids in the creation of scenarios. [Back to FAQs] See similar questions...