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

Jquery

Ques:- Need to add jQuery file in both Master and Content page?

Asked In :-

Right Answer:
You can add the jQuery file in the Master page to make it available to all Content pages, or you can add it in each Content page if you need specific versions or instances.

Jquery

Ques:- What are all the ways to include jQuery in a page?

Asked In :- Emtec Technologies, CEDCOSS Technologies, EPO,

Right Answer:
1. Include jQuery from a CDN (Content Delivery Network) using a `<script>` tag.
2. Download the jQuery library and include it locally using a `<script>` tag.
3. Use a package manager like npm or yarn to install jQuery and include it in your project.

Jquery

Ques:- What are the two types of CDNs?

Asked In :- FOX SOLUTIONS,

Right Answer:
The two types of CDNs are **push CDNs** and **pull CDNs**.

Jquery

Ques:- How to disable cut,copy and paste in TextBox using jQuery?

Asked In :- CEDCOSS Technologies,

Right Answer:
```javascript
$(document).ready(function() {
$('input[type="text"], textarea').on('cut copy paste', function(e) {
e.preventDefault();
});
});
```

Jquery

Ques:- What is the difference between “#” and “.” selector in JQuery?

Asked In :- Emertxe, einfochips, cadsys (india) limited,

Jquery

Ques:- What is jQuery code to select all links in first paragraph?

Asked In :- Jeeves ERP,

Right Answer:
```javascript
$('p:first a');
```

Jquery

Ques:- How do I pull a native DOM element from a jQuery object?

Asked In :- XIPHIAS Software Technologies, CEDCOSS Technologies, Niyuj, Mobiveil,

Right Answer:
You can pull a native DOM element from a jQuery object by using the `get()` method or by accessing the first element directly with `[0]`. For example:

```javascript
var nativeElement = $(selector).get(0);
// or
var nativeElement = $(selector)[0];
```

Jquery

Ques:- What are different type of selector in jQuery?

Asked In :- Quickbase, aptean,

Right Answer:
jQuery has several types of selectors, including:

1. **Basic Selectors**:
- Element Selector (`$("div")`)
- ID Selector (`$("#id")`)
- Class Selector (`$(".class")`)

2. **Attribute Selectors**:
- `[attribute]`, `[attribute=value]`, `[attribute^=value]`, `[attribute$=value]`, `[attribute*=value]`

3. **Hierarchy Selectors**:
- Descendant Selector (`$("parent child")`)
- Child Selector (`$("parent > child")`)
- Sibling Selector (`$("prev + next")`, `$("prev ~ siblings")`)

4. **Form Selectors**:
- `:input`, `:text`, `:checkbox`, `:radio`, `:selected`, etc.

5. **Filter Selectors**:
- `:first`, `:last`, `:even`, `:odd`, `:

Jquery

Ques:- How to disable/enable an element with jQuery?

Asked In :- alpha ori technology,

Right Answer:
To disable an element with jQuery, use:

```javascript
$('#elementId').prop('disabled', true);
```

To enable it, use:

```javascript
$('#elementId').prop('disabled', false);
```

Jquery

Ques:- Which sign is used as a shortcut for jQuery?

Asked In :- rolustech, psl,

Right Answer:
$

Jquery

Ques:- How can you apply a style on an element using jQuery?

Asked In :- VMC TECHNOLOGIES,

Right Answer:
You can apply a style on an element using jQuery with the `.css()` method. For example:

```javascript
$('.post-title').css('color', 'red');
```

Jquery

Ques:- How to check jQuery version?

Asked In :- Pinnacle Infotech Solutions Pvt Ltd, gemini solutions,

Right Answer:
You can check the jQuery version by using the following code:

```javascript
console.log(jQuery.fn.jquery);
```

or

```javascript
console.log($.fn.jquery);
```

Jquery

Ques:- Which one is more efficient, document.getElementbyId( “myId”) or $(“#myId)?

Asked In :- ZoomRx, KUB, version 1, c2fo,

Jquery

Ques:- What is the use of param() method?

Asked In :- Karza Technologies, amrita university, eplan software & service,

Right Answer:
The `param()` method in jQuery is used to create a URL-encoded string from an array or object, which is often used for sending data in an AJAX request.

Jquery

Ques:- Where jQuery code is getting executed?

Asked In :-

Right Answer:
jQuery code is executed in the browser, specifically in the client's web environment, typically within the `<script>` tags in an HTML document.

Jquery

Ques:- How do I check if an element is hidden in jQuery?

Asked In :- FOX SOLUTIONS, Bristlecone India, SSA, itc infotech, speridian technologies, palle technologies,

Right Answer:
You can check if an element is hidden in jQuery using the `:hidden` selector or the `.is(':hidden')` method. For example:

```javascript
if ($('#yourElement').is(':hidden')) {
// Element is hidden
}
```

Jquery

Ques:- What is the use of serialize method in jQuery?

Asked In :- srinsoft technologies, symbrio,

Right Answer:
The `serialize` method in jQuery is used to create a URL-encoded string of form elements' values, which can be sent to the server via an AJAX request.

Jquery

Ques:- How do you add an HTML element in DOM tree?

Asked In :- Sankey Solutions, Softsuave, smartek21,

Right Answer:
You can add an HTML element to the DOM tree using jQuery's `append()`, `prepend()`, `after()`, or `before()` methods. For example, to add a new `<div>` element inside an existing element with the ID `container`, you can use:

```javascript
$('#container').append('<div>New Element</div>');
```

Jquery

Ques:- How We Can Write Code Specific To Browser In Jquery?

Asked In :-

Right Answer:
You can write browser-specific code in jQuery by using the `$.browser` property, but since it is deprecated, it's better to use feature detection with Modernizr or check the user agent string with `navigator.userAgent`. For example:

```javascript
if (navigator.userAgent.indexOf("Chrome") !== -1) {
// Code specific to Chrome
} else if (navigator.userAgent.indexOf("Firefox") !== -1) {
// Code specific to Firefox
}
```

Jquery

Ques:- Which program is useful for testing jQuery?

Asked In :- nagarro,

Right Answer:
The program useful for testing jQuery is QUnit.

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.

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