Celebal Technologies Node JS Developer Interview Questions, Process, and Tips

Q1. Java Full stack
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Q2. Spring boot and microwave
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Q1. Java project and onions
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Q1. Java, sql ,springboot
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Q1. Dsa question, I don’t remember
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Q2. Check if the sentence is palindrome or not
Ans. 
To check if a sentence is a palindrome, compare it with its reverse form.
• Remove all non-alphanumeric characters and convert the sentence to lowercase.

• Reverse the sentence and compare it with the original sentence to check for palindrome.

• Example: 'A man, a plan, a canal, Panama' becomes 'amanaplanacanalpanama' after removing non-alphanumeric characters and converting to lowercase.
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Q1. Discussion was on Binary tree and tree traversal. Asked me to write binary tree complete program to insert amd traversal of binary tree with few changes on how to insert.
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Q2. In depth discussion on my experience my projects.
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Round duration - 60 minutes
Round difficulty - Easy

Technical round with questions on Java and Basic programming concepts.

Q1. What is a static variable and a static method in Java?
Ans. 
Static variables and methods belong to the class rather than instances of the class.
• Static variables are shared among all instances of a class.

• Static methods can be called without creating an instance of the class.

• Example: public static int count = 0; public static void incrementCount() { count++; }
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Q2. What is the difference between a For loop and a While loop?
Ans. 
For loop is used when the number of iterations is known, while While loop is used when the condition is true.
• For loop is used when the number of iterations is known beforehand.

• While loop is used when the condition is true.

• For loop has initialization, condition, and increment/decrement in one line.

• While loop only has a condition to check before each iteration.

• Example: for(int i=0; i<5; i++) { //code }

• Example: int i =
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Q3. What is a do-while loop?
Ans. 
A do-while loop is a control flow statement that executes a block of code at least once, and then repeatedly as long as a specified condition is true.
• The code block is executed first before checking the condition.

• The condition is checked after the code block is executed, and if it is true, the code block is executed again.

• The loop continues until the condition becomes false.

• Example: do { System.out.println('Hello'); }
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Occurance of every elements in string

Q1. All basic question core java
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Basic CS aptitude question

2 questions from Java and 2 questions from SQL, Easy to Medium Level

They let us choose our topic , We have to speak on that topic for few minutes , they will be checking the english fluency and presentation

Q1. Technical Round I got lucky; they asked me basic java questions and Basic SQL theory
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Q2. Create an array and sort them in descending order
Ans. 
Create and sort an array of strings in descending order
• Create an array of strings

• Use Arrays.sort() method with Collections.reverseOrder() comparator to sort in descending order
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Q3. Create an array and add the array
Ans. 
Create an array of strings and add the array
• Declare an array of strings

• Initialize the array with values

• Use a loop to add the values to the array
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