HGS Java Developer Interview Questions and Answers

Q1. Oops concept they asked
Add your answer
Q2. They asked spring boot
Add your answer

Q1. Write a query for inner join
Ans. 
An inner join query combines rows from two or more tables based on a related column between them.
• Use the SELECT statement to specify the columns you want to retrieve

• Use the FROM clause to specify the tables you want to join

• Use the INNER JOIN keyword to perform an inner join based on a common column
Answered by AI
Add your answer

Q1. What is difference between HashMap and HashTable ?
Ans. 
HashMap is non-synchronized and allows null values, while HashTable is synchronized and does not allow null values.
• HashMap is non-synchronized, meaning it is not thread-safe, while HashTable is synchronized, making it thread-safe.

• HashMap allows null values for both keys and values, whereas HashTable does not allow null keys or values.

• HashMap is faster than HashTable as it is non-synchronized, but HashTable is preferred...read more
Answered by AI
Add your answer

In aptitude test any company in first step

In any language code is most important .in any Developer

Q1. In resume language for the technical round
Add your answer

Comunication technology is most important

Q1. It is last round of
Add your answer
Q2. Any questions for HR
Add your answer

It was good and mostly apptitude

Two questions needs to be solved

Q1. About machine learning algorithms
Add your answer
Q2. Describe daTa analytics tools
Ans. 
Data analytics tools are software programs used to analyze and visualize large sets of data to extract valuable insights.
• Data visualization tools like Tableau and Power BI help in creating interactive charts and graphs.

• Statistical analysis tools like R and Python with libraries like Pandas and NumPy are used for advanced data analysis.

• Machine learning platforms like TensorFlow and scikit-learn are used for predictive a...read more
Answered by AI
Add your answer

Q1. Self intro about me
Add your answer
Q2. Explanation about their company
Add your answer

Basic questions of aptitude and some coding questions.

Q1. What is OOPS concepts?
Ans. 
OOPS concepts are the principles of Object-Oriented Programming that help in creating modular and reusable code.
• Encapsulation: Binding data and methods together in a single unit.

• Inheritance: Acquiring properties and behavior of a parent class by a child class.

• Polymorphism: Ability of an object to take many forms.

• Abstraction: Hiding implementation details and showing only functionality.

• Examples: Class, Object, Inheritan
Answered by AI
View 2 more answers
Q2. What is string?
Ans. 
String is a sequence of characters.
• In Java, String is a class that represents a sequence of characters.

• Strings are immutable, meaning their values cannot be changed once created.

• String literals are enclosed in double quotes, e.g. "Hello World".

• Strings can be concatenated using the + operator, e.g. "Hello" + "World".

• Strings have many built-in methods for manipulation, such as length(), substring(), and indexOf().
Answered by AI
View 1 more answer
Q3. Write the logic of palindrome?
Ans. 
Palindrome is a word, phrase, number, or other sequence of characters that reads the same backward as forward.
• Remove all non-alphanumeric characters from the string

• Convert the string to lowercase

• Reverse the string

• Compare the reversed string with the original string
Answered by AI
Add your answer

General knowledge ,appitude