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Articles by Samual Sam
Page 60 of 151
Fiber Optic Communications
In fiber optic communication, data is transmitted from the source to the destination by sending light pulses through optical fibers. It changes electrical pulses to light signals and vice versa for communication. Fiber optic communications are preferred when a huge amount of data needs to be transmitted across large distances.The process of communication using fiber optics has the following steps −Conversion of input electrical data to light signals : The data to be sent by the sender is in the form of electrical signals. These signals are converted to light pulses by the transmitter circuitry using a light source. A ...
Read MoreFiber Cables
Optical fiber cables are transparent, flexible fibers made up of glass or plastic through which light waves can pass. A bunch of fiber optic cables is shown in the following diagram −Structure of a Fiber – Optic CableA cross section of a fiber optic cable reveals three parts −Core − It is the innermost portion of an optical fiber through which light propagates. It is cylindrical in shape and it made up of a flexible glass of high refractive index. The diameter of the core of a single mode fiber is 8 – 10 μm while multimode fibers are 50 ...
Read MoreAural Media CSS Properties
Aural rendering of documents is mainly used by the visually impaired. The following are the aural media CSS properties −The azimuth property sets, where the sound should come from horizontally.The elevation property sets, where the sound should come from vertically.The cue-after specifies a sound to be played after speaking an element's content to delimit it from other.The cue-before specifies a sound to be played before speaking an element's content to delimit it from other.The cue is a shorthand for setting cue-before and cue-after.The pause-after specifies a pause to be observed after speaking an element's content.The pause-before specifies a pause to be observed ...
Read MoreHow can we add values into the columns of a MySQL table?
INSERT command is used to add values to the columns of a MySQL table. We need to specify the values in INSERT command for all the columns as follows −SyntaxINSERT INTO table_name values(value1, value2, …)ExampleSuppose we have a table named ‘Stock’ with three columns ‘Item_id’, ‘Item_name’ and ‘Item_rate’ then with the help of following query we can add values in these columns.mysql> INSERT INTO Stock values(1, 'HistoryBook', 250); Query OK, 1 row affected (0.07 sec) mysql> INSERT INTO Stock values(2, 'DBMSBook', 280); Query OK, 1 row affected (0.10 sec) mysql> Select * from Stock; +---------+-------------+-----------+ | item_id | ...
Read MoreCopyOnWriteArraySet Class in Java
Class declarationpublic class CopyOnWriteArraySet extends AbstractSet implements SerializableCopyOnWriteArraySet class uses CopyOnWriteArrayList internally for all of its operations and thus possesses the basic properties of CopyOnWriteArrayList.CopyOnWriteArraySet is a thread-safe.CopyOnWriteArraySet is to be used in Thread based environment where read operations are very frequent and update operations are rare.Iterator of CopyOnWriteArraySet will never throw ConcurrentModificationException.Any type of modification to CopyOnWriteArraySet will not reflect during iteration since the iterator was created.Set modification methods like remove, set and add are not supported in the iteration. This method will throw UnsupportedOperationException.CopyOnWriteArraySet MethodsFollowing is the list of important methods available in the CopyOnWriteArraySet class.Sr.No.Method & ...
Read MoreHow can I see the constraints which are applied to a table stored in the database I am currently using?
MySQL SHOW CREATE TABLE statement will provide us the constraints applied to a particular table along with some other details about that table. Its syntax would be as follows −SyntaxSHOW CREATE TABLE table_name;Here table_name is the name of the table on which we want to see the constraints.ExampleIn this example we are getting the detail of the table named ‘employees’ −mysql> Show Create table employees\G *************************** 1. row *************************** Table: employees Create Table: CREATE TABLE `employees` ( `Id` int(11) NOT NULL AUTO_INCREMENT, `Name` varchar(35) DEFAULT NULL, PRIMARY KEY (`Id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 1 ...
Read MoreDate Formatting Using printf
Date and time formatting can be done very easily using the printf method. You use a two-letter format, starting with t and ending in one of the letters of the table as shown in the following code.ExampleLive Demoimport java.util.Date; public class DateDemo { public static void main(String args[]) { // Instantiate a Date object Date date = new Date(); // display time and date String str = String.format("Current Date/Time : %tc", date ); System.out.printf(str); } }This will produce the following ...
Read MoreC# Program to find whether the Number is Divisible by 2
If the remainder of the number when it is divided by 2 is 0, then it would be divisible by 2.Let’s say our number is 5, we will check it using the following if-else −// checking if the number is divisible by 2 or not if (num % 2 == 0) { Console.WriteLine("Divisible by 2 "); } else { Console.WriteLine("Not divisible by 2"); }ExampleThe following is an example to find whether the number is divisible by 2 or not.Live Demousing System; using System.Collections.Generic; using System.Linq; using System.Text; namespace Demo { class MyApplication { static ...
Read MoreCommon Language Runtime (CLR) in C#.NET
Common Language Runtime (CLR) manages the execution of .NET programs. The just-in-time compiler converts the compiled code into machine instructions. This is what the computer executes.The services provided by CLR include memory management, exception handling, type safety, etc.Let us see the features of Common Language Runtime (CLR) in C#:ComponentsComponents in other languages can be easily worked upon with CLR.ThreadingThe CLR provides support for threads to create multithreaded applications.Class Library SupportIt has built-in types and libraries for assemblies, threading, memory management, etc.DebuggingCLR makes code debugging easier.Garbage CollectionIt provides automatic garbage collection in C#.
Read MoreCreate translucent windows in Java Swing
With JDK 7, we can create a translucent window using swing very easily. With following code, a JFrame can be made translucent.// Set the window to 55% opaque (45% translucent). frame.setOpacity(0.55f);ExampleSee the example below of a window with 55% translucency.import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.SwingUtilities; public class Tester { public static void main(String[] args) { JFrame.setDefaultLookAndFeelDecorated(true); // Create the GUI on the event-dispatching thread SwingUtilities.invokeLater(new Runnable() { @Override public void ...
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