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What is casting?
What is casting? There are two types of casting, casting between primitive numeric types and casting between object references. Casting between numeric types is used to convert larger values, such as double values, to smaller values, such as byte values. Casting between object references is used to ... 2012-07-30, 2793👍, 0💬

How do I do &lt; fill-in-the-blank &gt; for each element in an array?
How do I do &lt; fill-in-the-blank &gt; for each element in an array? #!/usr/bin/perl -w @homeRunHitters = ('McGwire', 'Sosa', 'Maris', 'Ruth'); foreach (@homeRunHitters) { print "$_ hit a lot of home runs in one year\n"; } 2013-09-16, 2791👍, 0💬

How do you connect to the database from JSP?
How do you connect to the database from JSP? A Connection to a database can be established from a jsp page by writing the code to establish a connection using a jsp scriptlets. Further then you can use the resultset object "res" to read data in the following way. 2013-08-08, 2790👍, 0💬

How do I read command-line arguments with Perl?
How do I read command-line arguments with Perl? With Perl, command-line arguments are stored in the array named @ARGV. $ARGV[0] contains the first argument, $ARGV[1] contains the second argument, etc. $#ARGV is the subscript of the last element of the @ARGV array, so the number of arguments on the c... 2013-09-19, 2784👍, 0💬

How do you know if an explicit object casting is needed?
How do you know if an explicit object casting is needed? If you assign a superclass object to a variable of a subclass's data type, you need to do explicit casting. For example: Object a; Customer b; b = (Customer) a; When you assign a subclass to a variable having a supeclass type, the casting is p... 2012-08-07, 2783👍, 0💬

The parameter “clienttarget = downlevel” does one of the following ...
The parameter “clienttarget = downlevel” does one of the following ... The parameter “clienttarget = downlevel” does one of the following * Adds aliases for specific user agents to an internal collection of user agent aliases * Indicates the useragents level of validating the controls *... 2014-07-07, 2782👍, 0💬

Can we use the constructor, instead of init(), to initialize servlet?
Can we use the constructor, instead of init(), to initialize servlet? Yes , of course you can use the constructor instead of init(). There’s nothing to stop you. But you shouldn’t. The original reason for init() was that ancient versions of Java couldn’t dynamically invoke constructors wit... 2013-07-10, 2782👍, 0💬

What is the difference between fgetpos/fsetpos and ftell/fseek? What are fgetpos and fsetpos good for?
What is the difference between fgetpos/fsetpos and ftell/fseek? What are fgetpos and fsetpos good for? ftell and fseek use type long int to represent offsets (positions) in a file, and may therefore be limited to offsets which can be represented in a long int. (Type long int is not guaranteed to hol... 2015-10-14, 2781👍, 0💬

I im trying to declare a pointer and allocate some space for it
I'm trying to declare a pointer and allocate some space for it, but it's not working. What's wrong with this code? char *p; *p = malloc(10); The pointer you declared is p, not *p. When you're manipulating the pointer itself (for example when you're setting it to make it point somewhere), you just us... 2016-06-10, 2776👍, 0💬

Where are shared assemblies stored?
Where are shared assemblies stored? Global assembly cache. 2014-12-19, 2776👍, 0💬

Binary value in Switch case
Is it possible to pass a binary value to 'case' of 'switch' statement?The control value which we are using to test is also binary. switch(binary value) { case 0000: System.out.println(" "); break; case 0001: System.out.println(" "); break; } 2014-02-20, 2775👍, 0💬

What state does a thread enter when it terminates its processing?
What state does a thread enter when it terminates its processing? When a thread terminates its processing, it enters the dead state. 2012-09-20, 2774👍, 0💬

Can each Java object keep track of all the threads that want to exclusively access to it?
Can each Java object keep track of all the threads that want to exclusively access to it? Yes. Use Thread.currentThread() method to track the accessing thread. 2012-06-13, 2774👍, 0💬

Describe run-time type identification.
Describe run-time type identification. The ability to determine at run time the type of an object by using the typeid operator or the dynamic_cast operator. 2012-03-22, 2774👍, 0💬

What is the difference between final, finally and finalize?
What is the difference between final, finally and finalize? Short answer: final - declares constant finally - relates with exception handling finalize - helps in garbage collection If asked to give details, explain: final field, final method, final class try/finally, try/catch/finally protected void... 2012-09-03, 2773👍, 0💬

What is the Set interface?
What is the Set interface? The Set interface provides methods for accessing the elements of a finite mathematical set. Sets do not allow duplicate elements. 2012-08-02, 2772👍, 0💬

Can a lock be acquired on a class?
Can a lock be acquired on a class? Yes, a lock can be acquired on a class. This lock is acquired on the class's Class object. 2012-09-17, 2770👍, 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... 2012-05-31, 2766👍, 0💬

What is the difference between the Font and FontMetrics classes?
What is the difference between the Font and FontMetrics classes? The FontMetrics class is used to define implementation-specific properties, such as ascent and descent, of a Font object 2012-07-17, 2763👍, 0💬

Which TextComponent method is used to set a TextComponent to the read-only state?
Which TextComponent method is used to set a TextComponent to the read-only state? setEditable() 2012-11-28, 2762👍, 0💬

If a class is located in a package, what do you need to change in the OS environment to be able to use it?
If a class is located in a package, what do you need to change in the OS environment to be able to use it? You need to add a directory or a jar file that contains the package directories to the CLASSPATH environment variable. Let's say a class Employee belongs to a package com.xyz.hr; and is located... 2012-05-28, 2762👍, 0💬

When would `local $_' in a function ruin your day?
When would `local $_' in a function ruin your day? When your caller was in the middle for a while(m//g) loop The /g state on a global variable is not protected by running local on it. That'll teach you to stop using locals. Too bad $_ can't be the target of a my() -- yet. 2013-09-20, 2759👍, 0💬

What invokes a thread's run() method?
What invokes a thread's run() method? After a thread is started, via its start() method of the Thread class, the JVM invokes the thread's run() method when the thread is initially executed. 2012-06-14, 2757👍, 0💬

Does it matter in what order catch statements for FileNotFoundException and IOExceptipon are written?
Does it matter in what order catch statements for FileNotFoundException and IOExceptipon are written? Yes, it does. The FileNoFoundException is inherited from the IOException. Exception's subclasses have to be caught first. 2012-06-13, 2757👍, 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