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Q2371. Given a max-heap represented as an array, Return the n th largest element without modifying the heap.

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Q2372. Write code to serialize and deserialize an array of strings ?

Core Java

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Q2373. Find number of recycled pairs in n array.

Data Structure

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Q2374. Find the length of the non repeated numbers in an array.

Data Structure

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Q2375. Can we have 3 dimensional arrays in Java ?

Core Java

Ans. Yes

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Q2376. Can we make array volatile in Java ?

Core Java

Ans. Yes, you can make an array (both primitive and reference type array e.g. an int array and String array) volatile in Java but only changes to reference pointing to an array will be visible to all threads, not the whole array

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Q2377. Write a program to insert a value after a specific value in an array.

Data Structure

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Q2378. How do you implement 'state and behavior' of object in Java program?

Core Java

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Q2379. How is it possible to use concat on string objects in Java, based on the fact that string is immutable?

Core Java

Ans. It's possible because internally java first reserves the memory for the new concatenated string and then copy that over. So after concatenation, there are 2 strings in memory, the original one and the concatenated one and then the reference is moved to the concatenated string.

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Q2380. Difference between static and dynamic memory allocation ?

Core Java

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Q2381. Why Arrays are considered as data structures whereas ArrayList isn't ?

Core Java

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Q2382. Are Arrays a data structure or a collection class ?

Core Java

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Q2383. Which Java version supports Interface Default methods ?

Core Java

Ans. Java 1.8 or Java 8

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Q2384. Tell something about Sleep method.

Core Java

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Q2385. What is the use of sql dialect ?

Hibernate

Ans. Dialect means "the variant of a language".

Similarly in case of SQL Dialect we specify what dialect of SQL to be generated keeping in mind of underlying database.

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Q2386. Which jar files need to be included for using Hibernate ?

Hibernate

Ans. hibernate-orm
hibernate-validator
hibernate-ogm
hibernate-search

or you can download hibernate core with all dependencies.

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Q2387. Diff between Runtime.getRunTime().gc() and System.gc()

Core Java

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Q2388. How to run jar file using command prompt

Core Java

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Q2389. Can we call a static method using reference currently pointing to null.

Core Java

Ans. yes, we can.
exa: public class Java{
public static void main(String... args) {
JAva j= null;
j.greeting(); // call with null reference
}
public static void greeting() {
System.out.println("Hello World");
}
} // output: Hello World

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Q2390. Which memory segment holds the byte code ?

Core Java

Ans. Code Segment

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Q2391. Have you ever worked on migrating AWS services and databases from one account to another ?

Amazon Web Services (AWS)

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Q2392. Have you worked with Data Feeds ?

General

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Q2393. Do you know how can we export Redis data ?

Redis

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Q2394. What is your daily work schedule ?

General

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Q2395. Have you heard of volatile Table in Teradata ?

Teradata

Ans. If you create table with VOLATILE option, the life of the table will be only for the current session.
It will be automatically dropped by Teradata manager once session expires.

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Q2396. Is this array declaration correct ? If not , Why ?

String[] strArray = new String[];

Core Java

Ans. No, We haven't specified the size of array to be initialized.

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Q2397. Is this array initialization correct ? If Yes, What will be the size of array ?

String[] strArray = new String[]{"Buggy","Bread"};

Core Java

Ans. Yes, size of the array will be 2.

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Q2398. Is this array initialization correct ? If Yes, What will be the size of array ?

String[] strArray = new String[3]{"Buggy","Bread"};

Core Java

Ans. No. It will result in error saying "Cannot define dimension expressions when an array initializer is provided"

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Q2399. Is this code valid

String[] strArray = new String[2];
strArray.length = 5;

Core Java

Ans. It will give compile time error saying "The final field array.length cannot be assigned"

Arrays once initialized cannot be resized.

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Q2400. What is the problem with this code

String[] strArray = new String[2];
strArray[0] = 5;

Core Java

Ans. We are trying to add an integer element to an array of String. Will give compile time error.

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