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What is the catch or declare rule for method declarations?
What is the catch or declare rule for method declarations? If a checked exception may be thrown within the body of a method, the method must either catch the exception or declare it in its throws clause. 2012-10-11, 2592👍, 0💬

How are the elements of a GridBagLayout organized?
How are the elements of a GridBagLayout organized? The elements of a GridBagLayout are organized according to a grid. However, the elements are of different sizes and may occupy more than one row or column of the grid. In addition, the rows and columns may have different sizes. 2012-07-24, 2589👍, 0💬

What is the purpose of the finally clause of a try-catch-finally statement?
What is the purpose of the finally clause of a try-catch-finally statement? The finally clause is used to provide the capability to execute code no matter whether or not an exception is thrown or caught. 2012-07-09, 2589👍, 0💬

What is delay signing?
What is delay signing? Delay signing allows you to place a shared assembly in the GAC by signing the assembly with just the public key. This allows the assembly to be signed with the private key at a later stage, when the development process is complete and the component or assembly is ready to be d... 2014-12-31, 2588👍, 0💬

Can a Byte object be cast to a double value?
Can a Byte object be cast to a double value? No, an object cannot be cast to a primitive value. 2012-11-05, 2587👍, 0💬

Is null a keyword?
Is null a keyword? The null value is not a keyword. 2012-09-18, 2587👍, 0💬

What is an object's lock and which objects have locks?
What is an object's lock and which objects have locks? An object's lock is a mechanism that is used by multiple threads to obtain synchronized access to the object. A thread may execute a synchronized method of an object only after it has acquired the object's lock. All objects and classes have lock... 2012-11-07, 2585👍, 0💬

How to make an array copy from System?
How to make an array copy from System? There is a method called arraycopy in the System class. You can do it: System.arraycopy(sourceArray, srcOffset, destinationArray, destOffset, numOfElements2Copy); When you use this method, the destinationArray will be filled with the elements of sourceArray at ... 2012-09-04, 2585👍, 0💬

What is JSP technology?
What is JSP technology? Java Server Page is a standard Java extension that is defined on top of the servlet Extensions. The goal of JSP is the simplified creation and management of dynamic Web pages. JSPs are secure, platform-independent, and best of all, make use of Java as a server-side scripting ... 2013-07-05, 2582👍, 0💬

I have heard that some operating systems dont actually allocate...
I've heard that some operating systems don't actually allocate malloc'ed memory until the program tries to use it. Is this legal? It's hard to say. The Standard doesn't say that systems can act this way, but it doesn't explicitly say that they can't, either. (Such a ``deferred failure'' implementati... 2016-04-21, 2581👍, 0💬

What is the easiest way to download the contents of a URL with Perl?
What is the easiest way to download the contents of a URL with Perl? Once you have the libwww-perl library, LWP.pm installed, the code is this: #!/usr/bin/perl use LWP::Simple; $url = get 'http://www.websitename.com/'; 2013-09-18, 2580👍, 0💬

What's the difference between the methods sleep() and wait()
What's the difference between the methods sleep() and wait() The code sleep(1000); puts thread aside for exactly one second. The code wait(1000), causes a wait of up to one second. A thread could stop waiting earlier if it receives the notify() or notifyAll() call. The method wait() is defined in th... 2012-09-11, 2580👍, 0💬

What is weak reference in Java
What is weak reference in Java A weak reference is one that does not prevent the referenced object from being garbage collected. You might use them to manage a HashMap to look up a cache of objects. A weak reference is a reference that does not keep the object it refers to alive. A weak reference is... 2012-09-10, 2579👍, 0💬

Are COM objects managed or unmanaged?
Are COM objects managed or unmanaged? Since COM objects were written before .NET, apparently they are unmanaged. Any code not written in the Microsoft .NET framework environment is UNMANAGED. So naturally COM+ is unmanaged because it is written in Visual Basic 6. 2014-12-02, 2577👍, 0💬

In System.out.println(),what is System,out and println,pls explain?
In System.out.println(),what is System,out and println,pls explain? System is a predefined final class,out is a PrintStream object acting as a field member and println is a built-in overloaded method in the out object. 2012-08-20, 2577👍, 0💬

What is the difference between static and non-static variables?
What is the difference between static and non-static variables? A static variable is associated with the class as a whole rather than with specific instances of a class. Non-static variables take on unique values with each object instance. 2012-07-26, 2577👍, 0💬

What is synchronization and why is it important?
What is synchronization and why is it important? With respect to multithreading, synchronization is the capability to control the access of multiple threads to shared resources. Without synchronization, it is possible for one thread to modify a shared object while another thread is in the process of... 2012-09-17, 2576👍, 0💬

Can an object's finalize() method be invoked while it is reachable?
Can an object's finalize() method be invoked while it is reachable? An object's finalize() method cannot be invoked by the garbage collector while the object is still reachable. However, an object's finalize() method may be invoked by other objects. 2012-10-03, 2575👍, 0💬

Does Perl have reference type?
Does Perl have reference type? Yes. Perl can make a scalar or hash type reference by using backslash operator. For example $str = "here we go"; # a scalar variable $strref = \$str; # a reference to a scalar @array = (1..10); # an array $arrayref = \@array; # a reference to an array Note that the ref... 2013-09-12, 2574👍, 0💬

How do I use a scriptlet to initialize a newly instantiated bean?
How do I use a scriptlet to initialize a newly instantiated bean? A jsp:useBean action may optionally have a body. If the body is specified, its contents will be automatically invoked when the specified bean is instantiated. Typically, the body will contain scriptlets or jsp:setProperty tags to init... 2013-08-07, 2573👍, 0💬

Does garbage collection guarantee that a program will not run out of memory?
Does garbage collection guarantee that a program will not run out of memory? No, it doesn't. It is possible for programs to use up memory resources faster than they are garbage collected. It is also possible for programs to create objects that are not subject to garbage collection. 2012-06-25, 2573👍, 0💬

What is the relationship between the Canvas class and the Graphics class?
What is the relationship between the Canvas class and the Graphics class? A Canvas object provides access to a Graphics object via its paint() method. 2012-11-02, 2572👍, 0💬

How does Java handle integer overflows and underflows?
How does Java handle integer overflows and underflows? It uses those low order bytes of the result that can fit into the size of the type allowed by the operation. 2012-09-24, 2571👍, 0💬

What are the implicit objects?
What are the implicit objects? Implicit objects are objects that are created by the web container and contain information related to a particular request, page, or application. They are: --request --response --pageContext --session --application --out --config --page --exception 2013-07-08, 2570👍, 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