JAVA Interview Questions and Answers in 2025 (100+ Q&A)

Jquery

Ques:- How to work with jQuery parent(), children() and siblings()?

Asked In :- Singsys, FlyNava Technologies, ManekTech - Ahmedabad, aptean, scalefocus,

Right Answer:
In jQuery:

- **parent()**: This method returns the immediate parent element of the selected element. For example, `$('.child').parent()` will select the parent of elements with the class "child".

- **children()**: This method returns all the child elements of the selected element. For example, `$('.parent').children()` will select all children of elements with the class "parent".

- **siblings()**: This method returns all sibling elements of the selected element. For example, `$('.current').siblings()` will select all siblings of elements with the class "current".

Jquery

Ques:- How to get/set the html contents of an element using jQuery?

Asked In :- phonepe,

Right Answer:
To get the HTML contents of an element using jQuery, use:
```javascript
var htmlContent = $('.post-title').html();
```

To set the HTML contents of an element using jQuery, use:
```javascript
$('.post-title').html('<p>New HTML content</p>');
```

Jquery

Ques:- Is jQuery is a replacement of JavaScript?

Asked In :- Payoda, urjanet, aif,

Right Answer:
No, jQuery is not a replacement for JavaScript; it is a library that simplifies JavaScript programming.

Jquery

Ques:- Is jQuery a programming language?

Asked In :- Unvired, nomura research institute, blazeclan technologies,

Right Answer:
No, jQuery is not a programming language; it is a JavaScript library.

Jquery

Ques:- JQuery or JavaScript which is quicker in execution?

Asked In :- sioux,

Right Answer:
JavaScript is quicker in execution than jQuery because jQuery is a library built on top of JavaScript, which adds extra functionality and abstraction.

Jquery

Ques:- What is the difference between $.map and $.grep in jQuery?

Asked In :- Qualminds Technologies, litmus7 systems consulting, tradebyte software gmbh,

Right Answer:
`$.map` is used to transform an array by applying a function to each element and returning a new array, while `$.grep` is used to filter an array based on a condition, returning a new array with elements that pass the test.

Jquery

Ques:- How to resolve conflicts with other libraries?

Asked In :- PRIMUS Global Technologies, jade global,

Right Answer:
To resolve conflicts with other libraries in jQuery, you can use the jQuery.noConflict() method. This method releases the `$` variable so that other libraries can use it, allowing you to use jQuery with a different variable name, like `jQuery`. For example:

```javascript
var $j = jQuery.noConflict();
// Now you can use $j instead of $ for jQuery
$j(document).ready(function() {
// Your jQuery code here
});
```

Jquery

Ques:- Is Uncaught TypeError: $(…).modal is not a function a jQuery error?

Asked In :- XIPHIAS Software Technologies, ManekTech - Ahmedabad,

Right Answer:

Yes, "Uncaught TypeError: $(…).modal is not a function" is a jQuery error, indicating that the modal function is not recognized, likely due to the Bootstrap modal plugin not being loaded or jQuery not being properly included.

Jquery

Ques:- What is event.PreventDefault in jQuery?

Asked In :- Feathersoft Info Solutions, Interview Mocha, igt, dyson,

Right Answer:
`event.preventDefault()` in jQuery is a method used to prevent the default action of an event from occurring. For example, it can stop a form from submitting or a link from navigating to a new page when an event is triggered.

Jquery

Ques:- How to multiple version of jQuery?

Asked In :- speridian technologies,

Right Answer:
To use multiple versions of jQuery on the same page, you can use jQuery's `noConflict()` method. First, load the different versions of jQuery in the order you want to use them, then call `jQuery.noConflict()` after loading each version. Assign each version to a different variable to avoid conflicts. For example:

```html
<script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
<script>
var jQuery1 = jQuery.noConflict();
</script>

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
var jQuery2 = jQuery.noConflict();
</script>
```

Now you can use `jQuery1` for version 1.12.4 and `jQuery2` for version 3.6.0.

Jquery

Ques:- What does $(“P”) will select?

Asked In :- Object Frontier Software, veeva systems, icn, ascent software,

Jquery

Ques:- How to include jQuery in ASP.Net project?

Asked In :- Unvired, aptean,

Right Answer:
To include jQuery in an ASP.NET project, you can add it via a CDN by placing the following script tag in the `<head>` section of your ASPX page:

```html
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
```

Alternatively, you can download the jQuery file and add it to your project, then reference it like this:

```html
<script src="~/Scripts/jquery-3.5.1.min.js"></script>
```

Jquery

Ques:- How to prevent Right Click option using jquery?

Asked In :- Softsuave,

Right Answer:
You can prevent the right-click option using jQuery with the following code:

```javascript
$(document).ready(function() {
$(document).on("contextmenu", function(e) {
e.preventDefault();
});
});
```

Jquery

Ques:- What is each() function in jQuery? How do you use it?

Asked In :-

Right Answer:
The `each()` function in jQuery is used to iterate over a jQuery object, executing a function for each matched element. It can be used like this:

```javascript
$('.elements').each(function(index, element) {
// Your code here, where 'element' is the current DOM element
});
```

Jquery

Ques:- What happen if you return false from a jQuery event handler?

Asked In :- yardi, all e technologies, paxos,

Right Answer:
Returning false from a jQuery event handler prevents the default action of the event and stops the event from bubbling up the DOM.

Jquery

Ques:- How to debug jQuery?

Asked In :- ATMECS, ThoughtClan Technologies, COGNISOFT TECHNOLOGIES, Montecarlo, CloudThat, GKMIT, syncfusion, ethiopian electric power corp.,

Right Answer:
To debug jQuery, you can use the following methods:

1. **Browser Developer Tools**: Open the console in your browser (usually F12 or right-click > Inspect) to check for errors and log messages.
2. **Console.log()**: Use `console.log()` to print variable values and track the flow of your code.
3. **Breakpoints**: Set breakpoints in the Sources tab of the developer tools to pause execution and inspect variables.
4. **jQuery Migrate Plugin**: Use the jQuery Migrate plugin to identify deprecated features and compatibility issues.
5. **Error Handling**: Implement error handling with `.fail()` for AJAX calls to catch and debug errors.

Jquery

Ques:- What is jQuery CDN?

Asked In :- Zen Corp Techno Solutions, VBeyond, MG Motor, taazaa inc,

Right Answer:
jQuery CDN (Content Delivery Network) is a service that hosts the jQuery library on remote servers, allowing developers to include jQuery in their web projects by linking to it online instead of hosting it locally. This can improve loading times and reduce server load.

Jquery

Ques:- What does the jQuery migrate function do?

Asked In :- ste,

Right Answer:
The jQuery migrate function helps developers transition from older versions of jQuery to newer ones by providing support for deprecated features and warnings about changes in behavior.

Jquery

Ques:- How to multiple AJAX requests be run simultaneously in jQuery?

Asked In :- monocept,

Right Answer:
You can run multiple AJAX requests simultaneously in jQuery by calling `$.ajax()` multiple times without waiting for one to complete before starting the next. For example:

```javascript
$.ajax({
url: 'url1',
method: 'GET',
success: function(data) {
console.log('Response from URL 1:', data);
}
});

$.ajax({
url: 'url2',
method: 'GET',
success: function(data) {
console.log('Response from URL 2:', data);
}
});
```

Jquery

Ques:- How to execute jQuery code after the DOM is ready?

Asked In :- SEEBURGER,

Right Answer:
You can execute jQuery code after the DOM is ready by using the following syntax:

```javascript
$(document).ready(function() {
// Your jQuery code here
});
```

Or, you can use the shorthand version:

```javascript
$(function() {
// Your jQuery code here
});
```

The Java skill section on takluu.com is designed for freshers, intermediate developers, and experienced professionals aiming to crack Java-based technical interviews with confidence. Java remains one of the most in-demand programming languages, and mastering it opens the door to countless opportunities in backend development, enterprise solutions, Android apps, and cloud-based platforms.

Our Java category covers everything from Core Java concepts like OOPs (Object-Oriented Programming), Data Types, Loops, and Exception Handling to Advanced Java topics including Collections Framework, Multithreading, JDBC, Servlets, JSP, Lambda Expressions, and Streams. We provide practical coding examples, real interview questions (with answers), and key concept explanations that interviewers commonly test.

Whether you’re applying for a role like Java Developer, Backend Engineer, or Full Stack Developer, this section ensures you understand the logic, syntax, and problem-solving approaches that matter in real-world interviews. You’ll also find scenario-based questions and discussions around design patterns, JVM internals, garbage collection, and performance tuning — areas often explored in senior-level interviews.

Each topic is structured to help you revise quickly and efficiently, with quizzes and mock interviews to assess your understanding. Our content is curated by experts who have worked with Java across different domains and keep the material aligned with current industry trends.

At Takluu, we believe in not just learning Java — but preparing to think in Java. Get ready to face interviews with clarity, confidence, and a deep understanding of what makes Java so powerful and reliable.

Questions in: JAVA

What makes Takluu valuable for interview preparation?

Get Our Mobile App

Programming

Reasoning

Network & Telecom

Management

What makes Takluu valuable for interview preparation?