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Why are the interfaces more flexible than abstract classes?
Why are the interfaces more flexible than abstract classes? --An interface-defined type can be implemented by any class in a class hierarchy and can be extended by another interface. In contrast, an abstract-class-defined type can be implemented only by classes that subclass the abstract class. --An... 2013-03-06, 2554👍, 0💬

What event results from the clicking of a button?
What event results from the clicking of a button? The ActionEvent event is generated as the result of the clicking of a button. 2012-12-06, 2554👍, 0💬

Why does JComponent have add() and remove() methods but Component does not?
Why does JComponent have add() and remove() methods but Component does not? because JComponent is a subclass of Container, and can contain other components and jcomponents. How can I implement a thread-safe JSP page? - You can make your JSPs thread-safe by having them implement the SingleThreadModel... 2013-07-20, 2552👍, 0💬

What interface must an object implement before it can be written to a stream as an object?
What interface must an object implement before it can be written to a stream as an object? An object must implement the Serializable or Externalizable interface before it can be written to a stream as an object. 2012-08-06, 2552👍, 0💬

When can an object reference be cast to an interface reference?
When can an object reference be cast to an interface reference? An object reference can be cast to an interface reference when the object implements the referenced interface. 2012-07-13, 2552👍, 0💬

Can a double value be cast to a byte?
Can a double value be cast to a byte? Yes, a double value can be cast to a byte. 2012-10-25, 2551👍, 0💬

I want to expose my .NET objects to COM objects. Is that possible?
I want to expose my .NET objects to COM objects. Is that possible? Yes, but few things should be considered first. Classes should implement interfaces explicitly. Managed types must be public. Methods, properties, fields, and events that are exposed to COM must be public. Types must have a public de... 2014-12-10, 2550👍, 0💬

What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy?
What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy? The Reader/Writer class hierarchy is character-oriented, and the InputStream/OutputStream class hierarchy is byte-oriented. 2012-11-15, 2550👍, 0💬

What is polymorphism?
What is polymorphism? Polymorphism means "having many forms". It allows methods (may be variables) to be written that needn't be concerned about the specifics of the objects they will be applied to. That is, the method can be specified at a higher level of abstraction and can be counted on to work e... 2012-08-14, 2549👍, 0💬

How would you make a copy of an entire Java object with its state?
How would you make a copy of an entire Java object with its state? Have this class implement Cloneable interface and call its method clone(). 2013-04-16, 2548👍, 0💬

There are two classes: A and B. The class B need to inform a class A when some important event has happened. What Java techniqu
There are two classes: A and B. The class B need to inform a class A when some important event has happened. What Java technique would you use to implement it? If these classes are threads I'd consider notify() or notifyAll(). For regular classes you can use the Observer interface. 2013-04-19, 2545👍, 0💬

What is .NET?
What is .NET? .NET is essentially a framework for software development.It is similar in nature to any other software development framework (J2EE etc) in that it provides a set of runtime containers/capabilities, and a rich set of pre-built functionality in the form of class libraries and APIs The .N... 2013-09-26, 2544👍, 0💬

If my class already extends from some other class what should I do if I want an instance of my class to be thrown as an exceptio
If my class already extends from some other class what should I do if I want an instance of my class to be thrown as an exception object? One can not do anytihng in this scenarion. Because Java does not allow multiple inheritance and does not provide any exception interface as well. 2013-05-30, 2538👍, 0💬

What is the relationship between an event-listener interface and an event-adapter class?
What is the relationship between an event-listener interface and an event-adapter class? An event-listener interface defines the methods that must be implemented by an event handler for a particular kind of event. An event adapter provides a default implementation of an event-listener interface. 2012-12-03, 2538👍, 0💬

Explain the usage of Java packages.
Explain the usage of Java packages. This is a way to organize files when a project consists of multiple modules. It also helps resolve naming conflicts when different packages have classes with the same names. Packages access level also allows you to protect data from being used by the non-authorize... 2012-08-09, 2538👍, 0💬

What is the purpose of the finally clause of a try-catch-finally statement? garbage collector?
What is the purpose of the finally clause of a try-catch-finally statement? garbage collector? The finally clause is used to provide the capability to execute code no matter whether or not an exception is thrown or caught. 2012-10-23, 2537👍, 0💬

How do you create a read-only collection?
How do you create a read-only collection? The Collections class has six methods to help out here: 1. unmodifiableCollection(Collect ionc) 2. unmodifiableList(List list) 3. unmodifiableMap(Map m) 4. unmodifiableSet(Set s) 5. unmodifiableSortedMap(SortedMa pm) 6. unmodifiableSortedSet(SortedSe ts) If ... 2012-08-30, 2535👍, 0💬

Can you inherit a COM class in a .NET application?
Can you inherit a COM class in a .NET application? The .NET Framework extends the COM model for reusability by adding implementation inheritance. Managed types can derive directly or indirectly from a COM coclass; more specifically, they can derive from the runtime callable wrapper generated by the ... 2014-12-10, 2534👍, 0💬

What does it mean?
Is char a[3] = "abc"; legal? What does it mean? It is legal in ANSI C (and perhaps in a few pre-ANSI systems), though useful only in rare circumstances. It declares an array of size three, initialized with the three characters 'a', 'b', and 'c', without the usual terminating '\0' character. The arra... 2015-12-09, 2533👍, 0💬

What are the XML files that are important in developing an ASP.NET application?
What are the XML files that are important in developing an ASP.NET application? The XML file necessary for the for developing an asp.net application is Web.config 2014-09-22, 2533👍, 0💬

What does it mean that a method or field is "static"?
What does it mean that a method or field is "static"? Static variables and methods are instantiated only once per class. In other words they are class variables, not instance variables. If you change the value of a static variable in a particular object, the value of that variable changes for all in... 2013-06-20, 2532👍, 0💬

How do you restrict a user to cut and paste from the html page?
How do you restrict a user to cut and paste from the html page? Using Servlet or client side scripts to lock keyboard keys. It is one of solutions. 2012-08-10, 2531👍, 0💬

How can you write a loop indefinitely?
How can you write a loop indefinitely? for(;;)--for loop; while(true)--always true, etc. 2012-06-27, 2531👍, 0💬

What is the Collections API?
What is the Collections API? The Collections API is a set of classes and interfaces that support operations on collections of objects. 2012-09-21, 2529👍, 0💬

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.NET C C++ CSS DBA General HTML Java JavaScript JSP JUnit MySQL Networking Oracle Perl Perl PHP PL/SQL RSS Software QA SQL Server Struts Unix Windows XHTML XML