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Can an abstract class be final?
Can an abstract class be final? An abstract class may not be declared as final. 2013-01-17, 2135👍, 0💬

what is Application testing
Why is it important to test applications before the product reaches the end user? The software can hold deviations, which can lead to a loss in trust from supplier From contract and leagal point of view, it is important that the product has been tested properly To assure that manuals are correct 2014-11-24, 2133👍, 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, 2132👍, 0💬

What modifiers may be used with a top-level class?
What modifiers may be used with a top-level class? A top-level class may be public, abstract, or final. 2013-01-25, 2132👍, 0💬

How to turn on Perl warnings? Why is that important?
How to turn on Perl warnings? Why is that important? Perl is very forgiving of strange and sometimes wrong code, which can mean hours spent searching for bugs and weird results. Turning on warnings helps uncover common mistakes and strange places and save a lot of debugging time in the long run. The... 2013-08-27, 2131👍, 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, 2131👍, 0💬

What restrictions are placed on method overloading?
What restrictions are placed on method overloading? Two methods may not have the same name and argument list but different return types. 2012-12-19, 2131👍, 0💬

What are generations in Garbage Collection terminolgy? What is its relevance?
What are generations in Garbage Collection terminolgy? What is its relevance? Garbage Collectors make assumptions about how our application runs. Most common assumption is that an object is most likely to die shortly after it was created: called infant mortality. This assumes that an object that has... 2013-03-22, 2129👍, 0💬

What classes of exceptions may be thrown by a throw statement?
What classes of exceptions may be thrown by a throw statement? A throw statement may throw any expression that may be assigned to the Throwable type. 2013-01-03, 2129👍, 0💬

Do I need to import java.lang package any time? Why ?
Do I need to import java.lang package any time? Why ? No. It is by default loaded internally by the JVM. 2013-05-09, 2128👍, 0💬

How do I serialize an object to a file?
How do I serialize an object to a file? The class whose instances are to be serialized should implement an interface Serializable. Then you pass the instance to the ObjectOutputStream which is connected to a fileoutputstream. This will save the object to a file. 2013-05-20, 2127👍, 0💬

What is Overriding?
What is Overriding? When a class defines a method using the same name, return type, and arguments as a method in its superclass, the method in the class overrides the method in the superclass. When the method is invoked for an object of the class, it is the new definition of the method that is calle... 2013-05-10, 2127👍, 0💬

What is JIT?
What is JIT? JIT stands for Just In Time compiler. It compiles java byte code to native code. 2013-03-13, 2127👍, 0💬

Can an Interface have an inner class?
Can an Interface have an inner class? Yes public interface abc { static int i=0; void dd(); class a1 { a1() { int j; System.out.println("in interfia"); }; public static void main(String a1[]) { System.out.println("in interfia"); } } } 2013-02-04, 2127👍, 0💬

Can there be an abstract class with no abstract methods in it?
Can there be an abstract class with no abstract methods in it? yes. 2013-02-01, 2126👍, 0💬

What is the relationship between a method's throws clause and the exceptions that can be thrown during the method's execution?
What is the relationship between a method's throws clause and the exceptions that can be thrown during the method's execution? A method's throws clause must declare any checked exceptions that are not caught within the body of the method. 2012-12-27, 2126👍, 0💬

How do I set environment variables in Perl programs?
How do I set environment variables in Perl programs? you can just do something like this: $ENV{'PATH'} = '...'; As you may remember, "%ENV" is a special hash in Perl that contains the value of all your environment variables. Because %ENV is a hash, you can set environment variables just as you'd set... 2013-08-21, 2125👍, 0💬

How do I use comments within a JSP page?
How do I use comments within a JSP page? You can use "JSP-style" comments to selectively block out code while debugging or simply to comment your scriptlets. JSP comments are not visible at the client. For example: --%&gt; You can also use HTML-style comments anywhere within your JSP page. These... 2013-07-25, 2125👍, 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, 2125👍, 0💬

The two properties of a DataGrid that has to be specified to turn on sorting and paging respectively are ...
The two properties of a DataGrid that has to be specified to turn on sorting and paging respectively are ... The two properties of a DataGrid that has to be specified to turn on sorting and paging respectively are * EnableSorting = “true” and EnablePaging = “true” * DisableSorting = â... 2014-07-21, 2124👍, 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, 2124👍, 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, 2124👍, 0💬

Assuming both a local($var) and a my($var) exist, what's the difference between ${var} and ${"var"}?
Assuming both a local($var) and a my($var) exist, what's the difference between ${var} and ${"var"}? ${var} is the lexical variable $var, and ${"var"} is the dynamic variable $var. Note that because the second is a symbol table lookup, it is disallowed under `use strict "refs"'. The words global, lo... 2013-08-26, 2123👍, 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, 2123👍, 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