Mkotla has Published 118 Answers

Should I include language="javascript" in my SCRIPT tags?

mkotla
mkotla
Published on 05-Jan-2018 17:35:54
The language attribute in JavaScript is optional since the introduction of HTML5 brought some new improvements. JavaScript became the default language for HTML5 and modern browsers. Therefore, now adding javascript isn’t required in <script> tag.This attribute specifies what scripting language you are using. Typically, its value will be javascript. Although ... Read More

How to Line Breaks to JavaScript Alert?

mkotla
mkotla
Published on 05-Jan-2018 16:15:42
To add line breaks to JavaScript alert, use “\r\n”. In the following example, we will see how to display text in JavaScript alert.Example Live Demo<html>    <body>       <script>          function DisplayAlert() {             var newLine = "\r\n"       ... Read More

What does the leading semicolon in JavaScript libraries do?

mkotla
mkotla
Published on 05-Jan-2018 15:53:06
A function in JavaScript looks like the following:(function(){...})()A library in JavaScript shows a function, which begins with a semicolon, for example:;(function ) { }The semicolon allows to safely concatenate several JS files into one. This is to serve it faster as one HTTP request.A leading semicolon can also be to ... Read More

What is the 'new' keyword in JavaScript?

mkotla
mkotla
Published on 05-Jan-2018 14:19:00
The new keyword in JavaScript is the new operator. It creates an instance of a user-defined object type.Here’s the syntax:new constructor[([arguments])]ExampleLet us see an example to learn about the usage of new operator:<!DOCTYPE html> <html>    <body>       <p id = "test"></p>       <script>     ... Read More

What is the difference between null and undefined in JavaScript?

mkotla
mkotla
Published on 04-Jan-2018 17:10:55
In JavaScript, undefined is a type, whereas null an object.undefinedIt means a variable declared, but no value has been assigned a value.For example, var demo; alert(demo); //shows undefined alert(typeof demo); //shows undefinednullWhereas, null in JavaScript is an assignment value. You can assign it to a variable.For example, var demo = ... Read More

What are JavaScript language resources?

mkotla
mkotla
Published on 04-Jan-2018 14:52:01
JavaScript resources include resources for the scripting languages standard ECMAScript.This is standardized in the ECMA-262 and ECMA-402 specifications.Here is the ECMAScript standard for the current editions:ECMA-2629th Edition - This is ECMAScript 2018 Language Specification.ECMA-402 5th Edition - This is ECMAScript 2018 Internationalization API Specification.Here are the ECMAScript standards for historical ... Read More

How multiple inheritance is implemented using interfaces in Java?

mkotla
mkotla
Published on 03-Jan-2018 12:07:14
Java does not support multiple inheritance. This means that a class cannot extend more than one class. Therefore, following is illegal −Examplepublic class extends Animal, Mammal{}However, a class can implement one or more interfaces, which has helped Java get rid of the impossibility of multiple inheritance.The extends keyword is used ... Read More

Why is method overloading not possible by changing the return type of the method only in java?

mkotla
mkotla
Published on 03-Jan-2018 11:35:36
Overloading is the mechanism of binding the method call with the method body dynamically based on the parameters passed to the method call. If you observe the following example, it contains two methods with same name, different parameters and if you call the method by passing two integer values the ... Read More

Are static methods inherited in Java?

mkotla
mkotla
Published on 03-Jan-2018 10:12:33
The static keyword is used to create methods that will exist independently of any instances created for the class. Static methods do not use any instance variables of any object of the class they are defined in. Static methods take all the data from parameters and compute something from those ... Read More

What are inner classes in Java?

mkotla
mkotla
Published on 02-Jan-2018 18:16:46
Java allows writing classes within classes and the class which is written inside another is known as inner class.Inner classes are a kind of security mechanism in Java.You can declare an inner class private once you do it cannot be accessed from an object outside the class.Java supports three kinds ... Read More
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