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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, 2839👍, 0💬

How many methods in Object class?
How many methods in Object class? This question is not asked to test your memory. It tests you how well you know Java. Ten in total. clone() equals() & hashcode() getClass() finalize() wait() & notify() toString() 2012-06-29, 2838👍, 0💬

Name the containers which uses Border Layout as their default layout?
Name the containers which uses Border Layout as their default layout? Containers which uses Border Layout as their default are: window, Frame and Dialog classes. 2012-05-21, 2838👍, 0💬

How to create a thread in a program?
How to create a thread in a program? You have two ways to do so. First, making your class "extends" Thread class. Second, making your class "implements" Runnable interface. Put jobs in a run() method and call start() method to start the thread. 2012-06-11, 2837👍, 0💬

A set of tables are maintained in a Dataset as ...
A set of tables are maintained in a Dataset as ... A set of tables are maintained in a Dataset as * TablesCollection object * DataTableCollection object * DataRowsCollection object * TableRowCollection object TablesCollection object 2014-07-11, 2836👍, 0💬

What is the difference between interface and abstract class?
What is the difference between interface and abstract class? interface contains methods that must be abstract; abstract class may contain concrete methods. interface contains variables that must be static and final; abstract class may contain non-final and final variables. members in an interface ar... 2012-07-10, 2834👍, 0💬

What is the difference between preemptive scheduling and time slicing?
What is the difference between preemptive scheduling and time slicing? Under preemptive scheduling, the highest priority task executes until it enters the waiting or dead states or a higher priority task comes into existence. Under time slicing, a task executes for a predefined slice of time and the... 2012-06-26, 2834👍, 0💬

Can you have two files with the same file name in GAC?
Can you have two files with the same file name in GAC? Yes, remember that GAC is a very special folder, and while normally you would not be able to place two files with the same name into a Windows folder, GAC differentiates by version number as well, so it’s possible for MyApp.dll and MyApp.dll ... 2014-12-29, 2832👍, 0💬

Assume that $ref refers to a scalar, an array, a hash or to some nested data structure. Explain the following statements:
Assume that $ref refers to a scalar, an array, a hash or to some nested data structure. Explain the following statements: $$ref; # returns a scalar $$ref[0]; # returns the first element of that array $ref- &gt; [0]; # returns the first element of that array @$ref; # returns the contents of that ... 2013-09-23, 2831👍, 0💬

How do I tell the client applications that are already installed to start using this new MyApp.dll?
How do I tell the client applications that are already installed to start using this new MyApp.dll? So let’s say I have an application that uses MyApp.dll assembly, version 1.0.0.0. There is a security bug in that assembly, and I publish the patch, issuing it under name MyApp.dll 1.1.0.0. How do ... 2014-12-29, 2830👍, 0💬

What is the difference between a Choice and a List?
What is the difference between a Choice and a List? A Choice is displayed in a compact form that requires you to pull it down to see the list of available choices. Only one item may be selected from a Choice. A List may be displayed in such a way that several List items are visible. A List supports ... 2012-12-24, 2830👍, 0💬

Can we use System.arraycopy() method to copy the same array?
Can we use System.arraycopy() method to copy the same array? Yes, you can. The source and destination arrays can be the same if you want to copy a subset of the array to another area within that array. 2012-09-04, 2830👍, 0💬

What restrictions are placed on the values of each case of a switch statement?
What restrictions are placed on the values of each case of a switch statement? During compilation, the values of each case of a switch statement must evaluate to a value that can be promoted to an int value. 2012-12-04, 2829👍, 0💬

What happens when a thread cannot acquire a lock on an object?
What happens when a thread cannot acquire a lock on an object? If a thread attempts to execute a synchronized method or synchronized statement and is unable to acquire an object's lock, it enters the waiting state until the lock becomes available. 2012-06-18, 2829👍, 0💬

What do you understand by Synchronization?
What do you understand by Synchronization? Synchronization is a process of controlling the access of shared resources by the multiple threads in such a manner that only one thread can access one resource at a time. In non synchronized multithreaded application, it is possible for one thread to modif... 2012-05-22, 2829👍, 0💬

What is the difference in using request.getRequestDispatcher() and context.getRequestDispatcher()?
What is the difference in using request.getRequestDispatcher() and context.getRequestDispatcher() ?request.getRequestDispatcher(p ath):In order to create it we need to give the relative path of the resource context.getRequestDispatcher(p ath):In order to create it we need to give the absolute path o... 2013-08-12, 2828👍, 0💬

What is the difference between yielding and sleeping?
What is the difference between yielding and sleeping? When a task invokes its yield() method, it returns to the ready state. When a task invokes its sleep() method, it returns to the waiting state. 2012-06-15, 2828👍, 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. 2012-06-05, 2828👍, 0💬

What happens if you dont initialize an instance variable of any of the primitive types in Java?
What happens if you dont initialize an instance variable of any of the primitive types in Java? Java by default initializes it to the default value for that primitive type. Thus an int will be initialized to 0, a boolean will be initialized to false. 2013-06-27, 2827👍, 0💬

What is an IO filter?
What is an IO filter? An IO filter is an object that reads from one stream and writes to another, usually altering the data in some way as it is passed from one stream to another. 2012-08-02, 2827👍, 0💬

What is the Properties class?
What is the Properties class? The properties class is a subclass of Hashtable that can be read from or written to a stream. It also provides the capability to specify a set of default values to be used. 2012-07-05, 2826👍, 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, 2826👍, 0💬

How can I dynamically allocate arrays?
How can I dynamically allocate arrays? The equivalence between arrays and pointers allows a pointer to malloc'ed memory to simulate an array quite effectively. After executing #include &lt;stdlib.h> int *dynarray; dynarray = malloc(10 * sizeof(int)); (and if the call to malloc succeeds), you can... 2016-04-23, 2823👍, 0💬

What is the package?
What is the package? The package is a Java namespace or part of Java libraries. The Java API is grouped into libraries of related classes and interfaces; these libraries are known as packages. 2013-02-21, 2823👍, 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