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Interview Questions and Answers - Order By Newest

Q3271. Write a program to make an array act as a set.

Core Java

Ans. public Set convertArrayToList(T array[]) {
Set set = new HashSet<>(Arrays.asList(array));
return set;
}

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Q3272. Write a unit test case using java 8.

JUnit

Ans. public List convertAllToUpperCase(List words) {
return words.stream().map(String::toUpperCase).collect(Collectors.toList());
}

@Test
public void testAllToUpperCase() {
List expected = Arrays.asList("JAVA8", "STREAMS");
List result = convertAllToUpperCase(Arrays.asList("java8", "streams"));
assertEquals(expected, result);
}

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Q3273. How would you design the database schema for an event?

Database

Ans. Broad question, but if the company need velocity, think about use a NO SQL instead of regular SQL databases.

Also prefers materialized views instead of joins to fetch data quickly.

Regarding the database design, there are very good design tools for professional database (to develop proper indexes and good database design) one of the best is QuickDBD

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Q3274. What are your goals: personal, business, financial

General

^{This question was recently asked at 'Cain Realty Group'.This question is still unanswered. Can you please provide an answer.}

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Q3275. What is the difference betwen Bean and Pojo ?

Ans. https://www.geeksforgeeks.org/pojo-vs-java-beans/

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Q3276. What are the advantages and disadvantages of Lambda Expression ?

Core Java

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Q3277. When you build an angular application, what type of file it creates which we can deploy?

Angular JS

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Q3278. How you debug and troubleshoot slowness with a REST call?

Rest

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Q3279. Give an example of a time when someone provided critical feedback on your work

General

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Q3280. If you see bad code, would you rewrite it?

General

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Q3281. Can the value of a static variable be changed ?

Core Java

Ans. Yes the value of a static variable can be changed. It's the final keyword that restrict the modification of value not static.

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Q3282. Why wait(), notify(), notifyAll() methods are in Object class instead of Thread class?

Core Java

Ans. wait() and notify() methods are defined in Object class rather than Thread class.If wait() and notify() were on the Thread instead then each thread would have to know the status of every other thread and there is no way to know thread1 that thread2 was waiting for any resource to access.Hence, notify, wait, notifyAll methods are defined in object class in Java.

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Q3283. What is a csrf token ? What is it used for ?

Security

Ans. A CSRF token is a unique, secret, unpredictable value that is generated by the server-side application and transmitted to the client in such a way that it is included in a subsequent HTTP request made by the client. When the later request is made, the server-side application validates that the request includes the expected token and rejects the request if the token is missing or invalid.

CSRF tokens can prevent CSRF attacks by making it impossible for an attacker to construct a fully valid HTTP request suitable for feeding to a victim user. Since the attacker cannot determine or predict the value of a user's CSRF token, they cannot construct a request with all the parameters that are necessary for the application to honor the request.

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Q3284. Difference between XSS and CSRF ?

Security

Ans. SRF attack requires an authenticated session, whereas an XSS attack doesn’t.
XSS doesn’t require any user interaction.CSRF is restricted to the actions the victim can perform.
XSS requires a vulnerability to happen, whereas CSRF relies on tricking the user to click a link or access a page.
CSRF can only send an HTTP request but cannot view the response. XSS can send and receive HTTP requests and responses to extract the required data.

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Q3285. What is SameSite cookie attribute ?

Security

Ans. SameSite cookie attribute is used by browsers to identify how first- and third-party cookies should be handled.

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Q3286. How can we create an arraylist of unique values ?

Core Java

Ans. We can put the value in a set to enforce uniqueness and then dum those value into an arraylist.

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Q3287. How do you evaluate a product while migrating to open source ?

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Q3288. Write a Program to find out negative numbers in a list.

Design

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Q3289. Which set of technologies do you use in your company ?

General

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Q3290. Difference between Let and Var in Javascript ?

JavaScript

Ans. Var scopes the variable to the nearest function whereas Let scopes the variable to nearest block.

For example -

function printNumbers() {
for(var i = 1; i < 3: i++){
console.log(i);
}

console.log(i); // works fine and will print 3 as i has a function scope and not local loop scope
}

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Q3291. What is the difference between Angular JS (version 1x) and Angular (version 2x) ?

Angular

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Q3292. What is HMR or Hot Module Replacement in Angular ?

Angular JS

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Q3293. What are benefits of strongly typing variables ?

JavaScript

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Q3294. How is the declaration of enum in Typescript differ from Javascript ?

TypeScript

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Q3295. What is the type of variable if we don't set any type ?

TypeScript

Ans. Any

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Q3296. Can we do type casting in Typescript ?

TypeScript

Ans. Yes

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Q3297. What is arrow function in Typescript ?

TypeScript

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Q3298. Interface vs Abstraction

Core Java

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Q3299. Explain your current project architecture.

Architecture

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Q3300. Explain Servlet config

Java EE

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