Tutorial by Examples: u

An input that allows for user-triggered actions when clicked or pressed. <button role="button">Add</button>

A cell containing header information for a column. <table role="grid"> <thead> <tr> <th role="columnheader">Day 1</th> <th role="columnheader">Day 2</th> <th role="columnheader">Day ...

A region containing related information that is declared as document content, as opposed to a web application. <div role="document"> <h1>The Life of Albert Einstein</h1> <p>Lorem ipsum...</p> </div>

A set of user interface objects which are not intended to be included in a page summary or table of contents by assistive technologies. <div role="group"> <button role"button">Previous</button> <button role"button">Next</button> &lt...

A type of live region where non-essential information changes frequently. <ul role="marquee"> <li>Dow +0.26%</li> <li>Nasdaq +0.54%</li> <li>S&P +0.44%</li> </ul>

A type of widget that offers a list of choices to the user. <ul role="menu"> <li role="menuitem">New</li> <li role="menuitem">Open</li> <li role="menuitem">Save</li> <li role="menuitem">Clo...

A presentation of menu that usually remains visible and is usually presented horizontally. <ul role="menubar"> <li role="menuitem">File</li> <li role="menuitem">Edit</li> <li role="menuitem">View</li> <...

An option in a group of choices contained by a menu or menubar. <ul role="menubar"> <li role="menuitem">File</li> <li role="menuitem">Edit</li> <li role="menuitem">View</li> <li role="menuitem&quot...

A checkable menuitem that has three possible values: true, false, or mixed. <ul role="menu"> <li role="menuitem">Console</li> <li role="menuitem">Layout</li> <li role="menuitemcheckbox" aria-checked="true"&g...

A checkable menuitem in a group of menuitemradio roles, only one of which can be checked at a time. <ul role="menu"> <li role="menuitemradio" aria-checked="true">Left</li> <li role="menuitemradio" aria-checked="false">C...

A group of radio buttons. <div role="radiogroup"> <input role="radio" type="radio" aria-checked="true"> One<br> <input role="radio" type="radio" aria-checked="false"> Two<br> <input role=...

A group containing one or more row elements in a grid. <table> <thead role="rowgroup"> <!-- etc --> </thead> <tbody role="rowgroup"> <!-- etc --> </tbody> </table>

A form of range that expects the user to select from among discrete choices. <input role="spinbutton" aria-valuemax="100" aria-valuemin="0" aria-valuenow="25" type="number" value="25">

A container whose content is advisory information for the user but is not important enough to justify an alert, often but not necessarily presented as a status bar. <div role="status">Online</div>

import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.IOException; import java.nio.charset.StandardCharsets; import java.nio.file.Files; import java.nio.file.Paths; public class ReadingUTF8TextFile { public static void main(String[] args) throws IOException { ...

import java.io.BufferedWriter; import java.io.IOException; import java.nio.charset.StandardCharsets; import java.nio.file.Files; import java.nio.file.Paths; public class WritingUTF8TextFile { public static void main(String[] args) throws IOException { //StandardCharsets is avail...

import java.nio.charset.StandardCharsets; import java.util.Arrays; public class GetUtf8BytesFromString { public static void main(String[] args) { String str = "Cyrillic symbol Ы"; //StandardCharsets is available since Java 1.7 //for ealier version use ...

If you want to see the schema information of your table, you can use one of the following: SHOW CREATE TABLE child; -- Option 1 CREATE TABLE `child` ( `id` int(11) NOT NULL AUTO_INCREMENT, `fullName` varchar(100) NOT NULL, `myParent` int(11) NOT NULL, PRIMARY KEY (`id`), KEY `momm...

In general, it is considered good practice to throw by value (rather than by pointer), but catch by (const) reference. try { // throw new std::runtime_error("Error!"); // Don't do this! // This creates an exception object // on the heap and would require you to catch the ...

Updating one row UPDATE customers SET email='[email protected]' WHERE id=1 This query updates the content of email in the customers table to the string [email protected] where the value of id is equal to 1. The old and new contents of the database table are illustrated below on the left an...