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

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Q1. What are your salary expectations?
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Q2. What is your family background?
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Q3. Share details of your previous job.
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Q4. Why should we hire you?
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Q5. Why are you looking for a change?
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Q6. Where do you see yourself in 5 years?
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Q7. What are your strengths and weaknesses?
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Q8. Tell me about yourself.
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Q1. What is the difference between collection and collections in core java
Ans. 
Collection is an interface while Collections is a utility class in Java.
• Collection is an interface that provides a standard way to represent and manipulate a group of objects.

• Collections is a utility class that provides various methods for working with collections.

• Collection is a single entity while Collections is a group of methods.

• Example: List is a type of Collection while Collections.sort() is a method in Collectio...read more
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Q2. What is Constructor in core Java
Ans. 
Constructor is a special method used to initialize objects in Java.
• Constructor has the same name as the class name

• It does not have a return type

• It can be overloaded

• It is called automatically when an object is created

• Example: public class Car { public Car() { // constructor code } }
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Q1. As per project requirements
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Q1. Project discussion and salary discussion
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Q1. Comparable and comparator
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Q2. Instance and local variable
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Q3. Abstract and interface
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Q4. Constructor and Methods
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Q5. Http methods like post,get,put,delete
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Q1. Easy Questions - Oops Concept . real life examples Abstract Class Inheritance difference Final vs immutable Spring Concepts - dependency injection,about @autowired
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Q1. English Test - Speaking Fluent Eglish
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Q1. Difference between hashset and hashtable
Ans. 
HashSet is an unordered collection of unique elements, while Hashtable is a synchronized collection of key/value pairs.
• HashSet does not allow duplicate elements, while Hashtable does not allow duplicate keys.

• HashSet does not maintain insertion order, while Hashtable does not guarantee any order.

• HashSet allows null values, while Hashtable does not allow null keys or values.
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Q2. Collection vs Collections
Ans. 
Collection is an interface in Java that represents a group of objects, while Collections is a utility class that contains static methods for operating on collections.
• Collection is an interface in Java that represents a group of objects.

• Collections is a utility class in Java that contains static methods for operating on collections.

• Example: List<String> list = new ArrayList<>(); Collection<String> coll
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Q1. SQL query related questions
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Q2. Write a Java program to find the duplicate in Array
Ans. 
Java program to find duplicates in an array of strings
• Create a HashSet to store unique elements

• Iterate through the array and check if element is already in the HashSet

• If element is already in the HashSet, it is a duplicate
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