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Lesson Posted on 26 Sep IT Courses/Java IT Courses/Java Script Training Tuition/BCA Tuition/Java Programming +5 IT Courses/Java/Core Java IT Courses/Java/JSP (Java Server Pages) IT Courses/QA/Selenium/Selenium with Java Tuition/BA Tuition/Programming in JAVA Tuition/Engineering Diploma Tuition/Advanced Java Programming less

How can everyone prepare to clear any Java interview?

Bright Computer Education

Bright Computer Education is Vadodara based Institute, works on All India Computer Education Mission....

Java interview your java should be much strong then J2EE. core java and Advance java is the basic foundation for Interview. Some of the topic about which you should know before going for a java interview are mentioned below: 1-JRE, JDK & JVM 2-OOPS 3-Different scenarios related to oops like scenarios... read more

Java interview your java should be much strong then J2EE. core java and Advance java is the basic foundation for Interview. Some of the topic about which you should know before going for a java interview are mentioned below:

1-JRE, JDK & JVM

2-OOPS

3-Different scenarios related to oops like scenarios based on compile-time and runtime polymorphism, different type of inheritence

4-exception hierarchy, checked and unchecked exception, Different scenarios related to exceptions

5-Threads , their states and ways of creating threads.

6-Collection framework and difference between different collections.

7-Generics.

8-Hashcode and equals and their contract.

9-Difference between:

         String & StringBuffer

         equals and ==

         checked and unchecked exceptions

         interface and abstract class

          Thread class and runnable interface.

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Answered on 19 Aug IT Courses/Web Development IT Courses/Java Script Training

Rajashekar

To become a UI professional start with basics of Web developement technologies : HTML5,CSS3,JavaScript,jQuery. After that start developing pages with the mentioned skills,later learn how to do responsive web applications, that can be achieved by CSS media queries and CSS framework : Bootstrap ,Foundation... read more

To become a UI professional start with basics of Web developement technologies : HTML5,CSS3,JavaScript,jQuery. After that start developing pages with the mentioned skills,later learn how to do responsive web applications, that can be achieved by CSS media queries and CSS framework : Bootstrap ,Foundation , you can learn anyone. And then comes Javascript frameworks : Angular,Vue,React,Meteor,Ember etc..

The Ultimate goal is develop SPA Applications. Have a good learning,all the best :-)

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Lesson Posted on 10 Jul IT Courses/Java Script Training

What is hoisting in Javascript?

Simran Kaur

I co-founded Webocity Technologies, an IT product & services company and while I train students in the...

As a matter of fact it is, javascript is an interpreted language and the javascript interpreter performs a lot of mystical stuff behind the scenes. Hoisting in JavaScript is certainly one of them. A quick Google search shows, the term means to raise or haul up. Something like this: Think of the crane... read more

As a matter of fact it is, javascript is an interpreted language and the javascript interpreter performs a lot of mystical stuff behind the scenes. Hoisting in JavaScript is certainly one of them. A quick Google search shows, the term means to raise or haul up.

Something like this:

Hoisting in javascript

Think of the crane as the javascript interpreter here ð??? ð???

 

Think of variables and functions in javascript as a result of two small but important steps, declaration and initialization.

Declarations and Initializations:

 
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var sampleGlobalVar; //declaration
sampleGlobalVar = 2; //initialization
var sampleInitializedGlobalVar = 1; //declaration and initialization in one straight step

 

In above piece of code,

1. The first line declares a variable called sampleGlobalVar.
2. The second line initializes or assigns the value to the variable sampleGlobalVar.
3. The third however, both declares and initializes the variables named sampleInitializedGlobalVar.

What we need to keep in mind is that variable declaration and initialization are always two different steps for the javascript interpreter. Even though we have the syntactic sugar to declare and initialize the variables in the same line, interpreter would still see it as a two step process identifying the declaration and initialization parts from the statement.

But you must ask,

What is hoisting in JavaScript?

Going by the definition, Hoisting is the process of moving the variable and function declarations to the top of their scope.Please note that we are referring here to the scope in which functions and variables are first declared which could be local or global.

You should also know that Javascript does not have block scopes

 

Resuming our discussion on hoisting, javascript interpreter would essentially be moving the declarations(always) to the top of the scopes in which they are declared.
For example: Assume we have this simple code in javascript,

 

 
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var sampleGlobalVar;
sampleGlobalVar = 2;
var sampleInitializedGlobalVar = 1;
 
function xyz(){
console.log("Inside the function in javascript");
var sampleLocalVar = 3;
console.log("local variable", sampleLocalVar);
}

 

What interpreter does is something like this and this is what you get from hoisting in JavaScript:

 

 
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var sampleGlobalVar; //declaration
var sampleInitializedGlobalVar; //declaration hoisted
sampleGlobalVar = 2;
sampleInitializedGlobalVar = 1; //initialization essentially remains where it was
 
function xyz(){
var sampleLocalVar; //declaration hoisted
console.log("Inside the function in javascript");
sampleLocalVar = 3;
console.log("local variable", sampleLocalVar);
}

 

But why is this important for us to understand? How does it matter to a developer if javascript interpreter performs hoisting.Let’s see that!

 

 
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3
4
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var sampleVar = 4
function xyz(){
console.log("variable hoisting demo", sampleVar);
var sampleVar = 8;
}

 

Output:
undefined

Surprised? Well, Don’t be!

Even though sampleVar has clearly been declared and initialized before trying to console its value inside the function xyz, it still outputs undefined.
First question: Why?
Hoisting.

Second question: How?
Shadowing.

Let’s see what is interpretor doing to our last piece of code: (This is an example of hoisting in JavaScript)

 

 
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var sampleVar;
sampleVar = 4
function xyz(){
var sampleVar;
console.log("variable hoisting demo", sampleVar);
sampleVar = 8;
}

 

We are getting closer now. Javascript interpreter moved the sampleVar declaration to top of each of its scope.

Having sampleVar moved to the top of its global scope did not create any difference in this particular example, but hold on buddy! Keep going.

Hoisting of local sampleVar certainly did create a lot of difference because of Shadowing. Shadowing is yet another concept to understand here.
Since shadowing is responsible for “masking” the value of global variable if a variable with the same name has been defined “locally”, var sampleVar; (undefined only yet) here masks the global value 4 which is why we get undefined consoled out inside of the function.

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Lesson Posted on 08 Jun IT Courses/Java Script Training

Javascript basic Interview Questions

Srinivas M.

I have been working as Web Developer for 12 years. I have completed above 2500+ static and dynamic sites....

Check below logical operators var a = false && 'Cat'; false var b = 'Cat' && 'Dog'; dog var c = 'Cat' || 'Dog'; cat var d = !true; false var e = !false; false what are a,b,c,d,e values ? var a ? 'srinivas' : 'welcome' //Ternary/Conditional operator what is a value... read more
  1. Check below logical operators
      var a = false && 'Cat';  false
      var b = 'Cat' && 'Dog';   dog
      var c = 'Cat' || 'Dog';  cat
      var d = !true;   false
      var e = !false;   false
      what are  a,b,c,d,e values ?
  2. var a ? 'srinivas' : 'welcome' //Ternary/Conditional operator
      what is a value why this answer?

  3. var a=(12,13,14,15);
    what is a value ?

  4. What is spred operator ?

  5. What Multi-line string, Placeholders for variables?
  6. Var x,y,z=1; what is x,y,z values ?

  7. Var x, var y=null x==y  ?  true or false?

  8. What is console.trace(), console.dir();?

  9. What is a constructor?

         10 Give me an example of prototype inheritance?

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Answered on 03 May IT Courses/Java IT Courses/Java/Core Java IT Courses/Java Script Training +1 IT Courses/QA/Selenium/Selenium with Java less

Ishita Pandey

Tutor

Hi, If you haven't finalised yet, I am interested in being an instructor. I will be teaching the newest version of Java, Java 10. Experience - 3 yrs as Software Engineer, BTech CSE, teaching Java to school and college students since 3 yrs.
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Lesson Posted on 13 Feb IT Courses/Java Script Training Tuition/BTech Tuition/Software Architecture Tuition/BCA Tuition/Software Engineering +3 Tuition/BSc Tuition/Software Engineering Tuition/BA Tuition/Software Engineering IT Courses less

What Is Mean Stack? Why Mean Stack Is Popular Now?

Shibaji D.

I am a working professional in an IT company as a Software Application Architect. I worked at various...

Mean Stack is standing for MongoDB, ExpressJS, AngularJS and NodeJS. These four javascript solutions create a high performing web application. Mainly JavaScript is the frontend language. It’s working with HTML, CSS. But now JavaScript also working on Server Side. But JavaScript not working in... read more

Mean Stack is standing for  MongoDB, ExpressJS, AngularJS and NodeJS. These four javascript solutions create a high performing web application. Mainly JavaScript is the frontend language. It’s working with HTML, CSS. But now JavaScript also working on Server Side. But JavaScript not working in server-side directly. NodeJS creates the javascript compilation environments. NodeJS coding structures are some time complex for the traditional coder who has to know about C, C++, Java, PHP, etc.

NodeJS APIs are executed with C language. Most of the NodeJS Coding structure written by Asynchronize design pattern. Through NodeJS, you can be developed desktop/mobile apps also. This is so much powerful platform for the software developers. Once you can understand about JavaScript and NodeJS, then you can be developed all type of application using this.

AngularJS is most well-known technology.  Most of the software developer knows about it. AngularJS is the frontend JS framework. It’s enhanced the coding pattern for the UI developers. There have so many concepts have for the developer. Like Directives, Scopes, Services, Factory, Promises, configuration etc. If you want to learn about more the follow my blog’s articles.

ExpressJS is the server side development framework. If you wanted to create a web application then you need to be using ExpressJS. ExpressJS can be handle website pages, routeing, controllers, model etc. Fullstack website development supports will be getting from it.

MongoDB is the JavaScript-based database. It’s developed for BigDB. NoSQL query language is using here. This database is the perfect match for Mean Stack development. We can easily store picture and movie data with bytecode. This database working performance the better from another database. Here has lots of memory management/optimisation process.

If you are wanted to discover as a software. Then you can be learning about Mean Stack. Mean is sometimes easy to learning. If you will get proper guideline for study. Most of the newcomers are confused about the development process. Which  Programming language will help me grow up my knowledge as a software developer. For this process, you need to learn about HTML, CSS, JavaScript, and JavaScript worked frontend/client side as well as it works as server end also. Every type of knowledgeable people/developer can develop their desire software with this knowledge.

Mean Stack learning process too much easy. But most of the time new developers/learner cannot understand how to study this process.  The main problem is distributed documentation for Mean Stack. And another problem is there have so many procedures to develop your software using Mean Stack software.

Sometimes some people ask me how to published my Mean stack software. What is the best server for using this type of application?

Mean Stack software too much easy to distribution process at this moments. But you wanted to serve your application online, then you needed cloud server. I will suggest digital ocean best of for every type of developers. Also, you can sign up with this link and you get $10 after confirmation of your account.

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Lesson Posted on 13 Feb IT Courses/Angular.JS IT Courses/Java Script Training IT Courses +2 IT Courses/Website Scripting IT Courses/Static Websites less

Angular 1 vs Angular 2

Shibaji D.

I am a working professional in an IT company as a Software Application Architect. I worked at various...

Angular team has released the angular 2, which has drastically change the way programmers interact and work with Angular framework in the past. In this post I will tell you the common changes made by the team in the current release. The primary goal of latest Angular 2 is to create an easier and more... read more

Angular 1 vs Angular 2

Angular team has released the angular 2, which has drastically change the way programmers interact and work with Angular framework in the past. In this post I will tell you the common changes made by the team in the current release. The primary goal of latest Angular 2  is to create an easier and more powerful web framework. Angular 2 is initially made with TypeScript, but this will be compatible with all latest JavaScript standards like ES5 and ES6 and Dart-lang.

New Component-Based Architecture

Angular 2 is based on component based architecture. Old Controllers and $scope systems is replaced with components and directives. Now controllers and directives are most important part of AngularJS based applications. Components work with selectors. A component has a selector and associated html tag to represent it.

Differences of Representation in Angular 1 and Angular 2:

Angular 1.x:

angular.module(‘myApp’,[])
.controller(‘TestCtrl”, function() {
});

 

Angular 2.0:
import {Component, View} from 'angular2/angular2';
@Component({
 
selector: 'my-view'
 
});

 

 

At bootstrap we have to declare components before we start working with them. These components have to be imported on the page where these are used.

Input with the Event Syntax:

Angular 2 makes events processing more simplified.  Now applications can respond to input as an event too. You can deal with input like an event. The event syntax is simple as now you can denote events within parenthesis.

Differences of User Input handling syntax in Angular 1 and Angular 2:

Angular 1.x:

 
 

Angular 2.0:

 
 

Better Performance:

Angular 2 is both faster and more memory efficient than Angular 1 this is done with the help of immutable data structures. Another reason for improved performance is introduction of uni-directional data flow. There is no direct way to implement two way data flow in angular 2 . This concept is in fact implemented in an entirely different way in Angular 2. You can use export syntax to do the same.

Data flow in Angular 2:

@View({
templateUrl: './components/example/example.html'
})

export class Example {} 
 

No $scope in Angular 2:

Although $scope variable was an important part of angular 1 but it is deprecated in angular 2.

But the main thing to consideration is even ‘$scope’ is deprecated it is in fact is replaced by “controller”. In angular 2 properties are bound to components itself to work in applications.

Angular 2 is more transparent due to Zones:

Angular 2 uses the zones mechanism. This ensures that old digest cycle is not necessary in the new environment. Angular 2 digest, if triggered by a component that is inside a zone:

Directives:

With a clean Directive annotation you can declare a directive in application. Directives can be used in components.

Improved Dependency Injection:

Angular 2 has a better and improved dependency injection system. There are much more opportunities for components based applications.

There are certain benefits other benefits of AngularJS. Element references can also be available to other parts of the template. Angular team has taken a  nice step to launch angular 2.

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Lesson Posted on 07 Feb IT Courses/Java IT Courses/Java Script Training Tuition/BCA Tuition/Java Programming +3 Tuition/BTech Tuition/Java Programming Tuition/Engineering Diploma Tuition/Java Programming IT Courses/Java/Core Java less

Java Interview Questions & Answers

Dev Group

Dev Group provides an in-depth IT & accounts training in Delhi. All the courses and training classes...

Java Interview Questions have been designed especially to get you acquainted with the nature of questions you may encounter during your interview for the subject of Java Programming Language. As per my experience, good interviewers hardly planned to ask any particular question during your interview,... read more

Java Interview Questions have been designed especially to get you acquainted with the nature of questions you may encounter during your interview for the subject of Java Programming Language. As per my experience, good interviewers hardly planned to ask any particular question during your interview, normally questions start with some basic concept of the subject and later they continue based on further discussion and what you answer.

Q 1. What do you know about Java?

Ans. Java is a high-level programming language originally developed by Sun Microsystems and released in 1995. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX.

Q 2. What are the supported platforms by Java Programming Language?

Ans. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX/Linux like HP-Unix, Sun Solaris, Redhat Linux, Ubuntu, CentOS, etc.

Ans. Some features include Object Oriented, Platform Independent, Robust, Interpreted, Multi-threaded.

Ans. It’s compiler generates an architecture-neutral object file format, which makes the compiled code to be executable on many processors, with the presence of Java runtime system.

Ans. Java uses Just-In-Time compiler to enable high performance. Just-In-Time compiler is a program that turns Java bytecode, which is a program that contains instructions that must be interpreted into instructions that can be sent directly to the processor.

Ans. It is designed to adapt to an evolving environment. Java programs can carry extensive amount of run-time information that can be used to verify and resolve accesses to objects on run-time.

Ans. When Java is compiled, it is not compiled into platform specific machine, rather into platform independent byte code. This byte code is distributed over the web and interpreted by virtual Machine (JVM) on whichever platform it is being run.
Q 8. List two Java IDE’s.

Ans. Netbeans, Eclipse, etc.

Q.9. List some Java keywords(unlike C, C++ keywords).

Ans. Some Java keywords are import, super, finally, etc.

Ans. Object is a runtime entity and it’s state is stored in fields and behavior is shown via methods. Methods operate on an object's internal state and serve as the primary mechanism for object-to-object communication.

Q11. Define class.

Ans. A class is a blue print from which individual objects are created. A class can contain fields and methods to describe the behavior of an object.

Ans. A class consist of Local variable, instance variables and class variables.

Ans. Variables defined inside methods, constructors or blocks are called local variables. The variable will be declared and initialized within the method and it will be destroyed when the method has completed.

Ans. Instance variables are variables within a class but outside any method. These variables are instantiated when the class is loaded.

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Lesson Posted on 01 Feb IT Courses/Java Script Training

Beginner JavaScript

Jagadesh G

I am a Software Professional with 15 + years in Software Development. I teach the fundamentals of web...

1. Javascript is a programming language that adds interactivity to your website. 2. JavaScript is a programming language that allows you to implement complex things on web pages. 3. Javascript is primarily used as a client-side scripting language .i.e it runs on our browser. 4. Java simple,... read more

1. Javascript is a programming language that adds interactivity to your website.

 

2. JavaScript is a programming language that allows you to implement complex things on web pages.

 

3. Javascript is primarily used as a client-side scripting language .i.e it runs on our browser.

 

4. Java simple, easy to understand with advanced features.

 

5. JavaScript 2.0 conforms to Edition 5 of the ECMAScript standard.

 

6. Javascript is fundamental for learning popular front-end frameworks and  libraries.

 

Front-end of the web application :

  • HTML is the markup language that we use to structure and give meaning to our web content, for example defining paragraphs, headings, and data tables, or embedding images and videos in the page.
  • CSS is a language of style rules that we use to apply styling to our HTML content, for example setting background colors and fonts, and laying out our content in multiple columns.
  • JavaScript is a scripting language that enables you to create dynamically updating content, control multimedia, animate images, and pretty much everything else. (Okay, not everything, but it is amazing what you can achieve with a few lines of JavaScript code.)

Language Fundamentals :

 

1. Variables: A variable can be declared with a keyword var.

  • var number1 = 1000;
  • var myname = "Asha" ;
  • Here we have declared variables and assigned values to them.
  • Strings are double or single quoted.
  • Variables declared outside function has global scope and is called Global variables.
  • Variables declared inside function has local scope and is called local variables. 
  • Variables names can start with alphabets or  _ .
  • Names cannot start with numbers. 
  • They are case sensitive.

JavaScript Variable c five data types

1. String

2. Number

3.Object

4.Boolean

5.Array

6. Object

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Lesson Posted on 17/11/2017 IT Courses/Java Script Training

String Comparison In Javascript

Guna

The JavaScript language Here we learn JavaScript, starting from scratch and go on to advanced concepts...

String Comparison in javascript: Let us learn how two strings are compared in javascript Assume you have two strings: "ant" and "ele" Case 1: alert("ant" < "ele" ); will give the result as true meaning "ant" is smaller than "ele". Because the first characters in string "ant" is "a" and in "ele"... read more

String Comparison in javascript:

Let us learn how two strings are compared in javascript

Assume you have two strings:

"ant" and "ele"

Case 1:

alert("ant" < "ele" ); will give the result as true meaning "ant" is smaller than "ele". Because the first characters in string "ant" is "a" and in "ele" "e". "a" is considered small because "a" comes before "e". This makes the string "ant" smaller than "ele".

Case 2:

"ant" and "Ant"

alert("ant" < "Ant"); will give the result as false meaning "Ant" is smaller than "ant".

"A" is smaller than "a" it is because of unicode values that are used to represent character in computer.
a ---------> 97
A --------->65

Case 3:

"ant" and "ant"

alert("ant" < "ant" ); will give the result as false because they are equal if first characters are equal, compare the second characters the same way. Continue until the end of any string. If both strings ended simultaneously then they are equal,
here it is found to be same till the end so they are equal.

Case 4:

"ant" and "ants"

alert("ant" < "ants"); will give the result as true because if first characters are equal, compare the second characters the same way. Continue until the end of any string. If both strings do not end simultaneously the longer string is greater.

Summary:

  • Check the first characters of both strings.
  • If the first string has the first character as greater or less, then the first string is greater (or less) than the second. We are done.
  • If first characters are equal, compare the second characters the same way continue until the end of any string
  • If both strings ended simultaneously, then they are equal. Otherwise the longer string is greater.
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