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 −  ... Read More

String function ASCII() in MySQL returns the ASCII number code of the specific character.SyntaxASCII(str)Here, str, the argument of ASCII() function, is the string whose ASCII value of the first character to be retrieved.It is pertinent to mention here that it will return the number code the left the most character ... Read More

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 ... Read More

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 ... Read More

By using MODIFY keyword with ALTER TABLE command we can modify the column/s of MySQL table. The syntax for the same is as follows;SyntaxAlter table table_name MODIFY column_name1 datatype, MODIFY column_name2 datatype… MODIFY column_nameN datatype);ExampleIn the example below, with the help of MODIFY keyword in ALTER Command, the size of ... Read More

Following is an example to add a given time to a particular date.ProgramLive Demoimport java.util.*; public class Main {    public static void main(String[] args) throws Exception {       Date d1 = new Date();       Calendar cl = Calendar. getInstance();       cl.setTime(d1);   ... Read More

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 ... Read More

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 ... Read More

Following example demonstrates how to check whether the date is in a proper format or not using matches method of String class.ExampleLive Demopublic class Main {    public static void main(String[] argv) {       boolean isDate = false;       String date1 = "8-05-1988";       ... Read More

GregorianCalendar is a concrete implementation of a Calendar class that implements the normal Gregorian calendar with which you are familiar. We did not discuss Calendar class in this tutorial, you can look up standard Java documentation for this.The getInstance( ) method of Calendar returns a GregorianCalendar initialized with the current date and ... Read More