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Can you make an instance of an abstract class? For example - java.util.Calender is an abstract class with a method getInstance()
Can you make an instance of an abstract class? For example - java.util.Calender is an abstract class with a method getInstance() which returns an instance of the Calender class. No! You cannot make an instance of an abstract class. An abstract class has to be sub-classed. If you have an abstract cla... 2012-08-21, 2275👍, 0💬

What is JVM?
What is JVM? JVM stands for Java Virtual Machine. It is the run time for java programs. All are java programs are running inside this JVM only. It converts java byte code to OS specific commands. In addition to governing the execution of an application's byte codes, the virtual machine handles relat... 2013-03-13, 2274👍, 0💬

What is the serialization?
What is the serialization? The serialization is a kind of mechanism that makes a class or a bean persistence by having its properties or fields and state information saved and restored to and from storage. 2013-02-25, 2273👍, 0💬

I made my class Cloneable but I still get 'Can't access protected method clone. Why?
I made my class Cloneable but I still get 'Can't access protected method clone. Why? Yeah, some of the Java books, in particular "The Java Programming Language", imply that all you have to do in order to have your class support clone() is implement the Cloneable interface. Not so. Perhaps that was t... 2013-02-07, 2273👍, 0💬

What are the problems faced by Java programmers who don't use layout managers?
What are the problems faced by Java programmers who don't use layout managers? Without layout managers, Java programmers are faced with determining how their GUI will be displayed across multiple windowing systems and finding a common sizing and positioning that will work within the constraints impo... 2013-01-31, 2273👍, 0💬

Why Thread is faster compare to process?
Why Thread is faster compare to process? A thread is never faster than a process. If you run a thread(say there's a process which has spawned only one thread) in one JVM and a process in another and that both of them require same resources then both of them would take same time to execute. But, when... 2013-03-21, 2272👍, 0💬

Why are the methods of the Math class static?
Why are the methods of the Math class static? So they can be invoked as if they are a mathematical code library. 2012-12-28, 2272👍, 0💬

Is it possible to share an HttpSession between a JSP and EJB? What happens when I change a value in the HttpSession from inside
Is it possible to share an HttpSession between a JSP and EJB? What happens when I change a value in the HttpSession from inside an EJB? You can pass the HttpSession as parameter to an EJB method, only if all objects in session are serializable. This has to be consider as "passed-by-value", that mean... 2013-07-27, 2271👍, 0💬

Can an unreachable object become reachable again?
Can an unreachable object become reachable again? An unreachable object may become reachable again. This can happen when the object's finalize() method is invoked and the object performs an operation which causes it to become accessible to reachable objects. 2013-06-17, 2271👍, 0💬

Can we define private and protected modifiers for variables in interfaces?
Can we define private and protected modifiers for variables in interfaces? Yes. 2013-02-05, 2271👍, 0💬

Can an exception be rethrown?
Can an exception be rethrown? Yes, an exception can be rethrown. 2012-12-13, 2271👍, 0💬

When you serialize an object, what happens to the object references included in the object?
When you serialize an object, what happens to the object references included in the object? The serialization mechanism generates an object graph for serialization. Thus it determines whether the included object references are serializable or not. This is a recursive process. Thus when an object is ... 2013-05-22, 2270👍, 0💬

Primitive data types are passed by reference or pass by value?
Primitive data types are passed by reference or pass by value? Primitive data types are passed by value. 2013-05-16, 2269👍, 0💬

How do you enable the concurrent garbage collector on Sun's JVM?
How do you enable the concurrent garbage collector on Sun's JVM? -Xconcgc options allows us to use concurrent garbage collector (1.2.2_07+)we can also use -XX:+UseConcMarkSweepGC which is available beginning with J2SE 1.4.1. 2013-03-28, 2269👍, 0💬

Can try statements be nested?
Can try statements be nested? Try statements may be tested. 2013-01-23, 2269👍, 0💬

What is meant by "Abstract Interface"?
What is meant by "Abstract Interface"? First, an interface is abstract. That means you cannot have any implementation in an interface. All the methods declared in an interface are abstract methods or signatures of the methods. 2013-04-06, 2268👍, 0💬

What is the purpose of the File class?
What is the purpose of the File class? The File class is used to create objects that provide access to the files and directories of a local file system. 2012-12-12, 2267👍, 0💬

What is externalization? Where is it useful??
What is externalization? Where is it useful?? Use the Externalizable interface when you need complete control over your Bean's serialization (for example, when writing and reading a specific file format). 2013-03-08, 2266👍, 0💬

What modifiers can be used with a local inner class?
What modifiers can be used with a local inner class? A local inner class may be final or abstract. 2012-12-11, 2265👍, 0💬

How are the elements of a CardLayout organized?
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. 2012-11-28, 2265👍, 0💬

Can an abstract class be final?
Can an abstract class be final? An abstract class may not be declared as final. 2013-01-17, 2264👍, 0💬

When to Use the Throughput Collector?
When to Use the Throughput Collector? Use the throughput collector when you want to improve the performance of your application with larger numbers of processors. In the default collector garbage collection is done by one thread, and therefore garbage collection adds to the serial execution time of ... 2013-03-25, 2263👍, 0💬

You can create an abstract class that contains only abstract methods. On the other hand, you can create an interface that declar
You can create an abstract class that contains only abstract methods. On the other hand, you can create an interface that declares the same methods. So can you use abstract classes instead of interfaces? Sometimes. But your class may be a descendent of another class and in this case the interface is... 2013-04-14, 2262👍, 0💬

Why isn't there operator overloading?
Why isn't there operator overloading? Because C++ has proven by example that operator overloading makes code almost impossible to maintain. In fact there very nearly wasn't even method overloading in Java, but it was thought that this was too useful for some very basic methods like print(). Note tha... 2013-02-11, 2261👍, 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