Mentorness Interview Questions and Answers

Q1. Question from pseudo code, ds and grammar are asked
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Q1. Tell me about yourself
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Q2. Exception handling in java
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Exception handling in Java allows for the handling of errors and exceptions that may occur during program execution.
• Java provides try-catch blocks to handle exceptions.

• The try block contains the code that may throw an exception.

• The catch block catches and handles the thrown exception.

• Multiple catch blocks can be used to handle different types of exceptions.

• The finally block is optional and is executed regardless of whe...read more
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Q3. Memory management in java
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Memory management in Java involves automatic garbage collection and manual memory allocation.
• Java uses automatic garbage collection to free up memory

• Developers can manually allocate memory using the 'new' keyword

• Java also has a 'finalize' method to clean up resources before garbage collection

• Memory leaks can occur if objects are not properly released
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Q4. What is Hash map in java
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Hash map is a data structure that stores key-value pairs and allows fast retrieval of values based on keys.
• Hash map uses hashing to store and retrieve values based on keys

• It allows null values and null keys

• It is not synchronized and not thread-safe

• Example: HashMap<String, Integer> map = new HashMap<>();

• map.put("apple", 1); int value = map.get("apple");
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Q5. Primary key and candidate key difference
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Primary key uniquely identifies a record while candidate key can also uniquely identify a record but may not be chosen as primary key.
• Primary key is a column or set of columns that uniquely identifies each record in a table

• Candidate key is a column or set of columns that can also uniquely identify each record in a table

• A table can have multiple candidate keys but only one primary key

• Primary key cannot have null values ...read more
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Q6. Super key and foreign key difference
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Super key is a set of attributes that uniquely identifies a record, while foreign key is a reference to a primary key in another table.
• Super key is a combination of one or more attributes that uniquely identifies a record in a table.

• Foreign key is a field in a table that refers to the primary key of another table.

• Super key can have additional attributes that are not necessary for uniqueness.

• Foreign key establishes a re...read more
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Q7. List all languages in Sql and explain
Ans. 
List of SQL languages and their brief explanation
• SQL (Structured Query Language) is a standard language for managing relational databases

• T-SQL (Transact-SQL) is a proprietary extension of SQL used by Microsoft SQL Server

• PL/SQL (Procedural Language/Structured Query Language) is Oracle Corporation's proprietary extension of SQL

• MySQL is an open-source relational database management system that uses SQL

• PostgreSQL is an ope...read more
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Q8. And some questions related to project
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They will ask you to code some basic coding question.

Q1. They will ask you some basic questions in sql, java
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Q1. Questions will be related to ds, pseudo code and logical reasoning
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Q1. Tell me about yourself
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Q2. Exceptional handling in java
Ans. 
Exceptional handling in Java is a mechanism to handle runtime errors and prevent program crashes.
• Java provides try-catch blocks to handle exceptions

• Multiple catch blocks can be used to handle different types of exceptions

• Finally block is used to execute code regardless of whether an exception is thrown or not
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Q3. Primary key, unique key, candidate key in sql
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Q4. Oops concepts in java
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Oops concepts are fundamental to Java programming and include inheritance, polymorphism, encapsulation, and abstraction.
• Inheritance allows a class to inherit properties and methods from a parent class.

• Polymorphism allows objects to take on multiple forms and behave differently based on their context.

• Encapsulation hides the implementation details of a class and only exposes necessary information.

• Abstraction focuses on t...read more
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Q5. Memory management and hash map in java
Ans. 
Memory management and hash map are important concepts in Java programming.
• Memory management is the process of allocating and deallocating memory in a program.

• Java uses automatic memory management through garbage collection.

• Hash map is a data structure that stores key-value pairs and uses hashing to retrieve values efficiently.

• Java's HashMap class implements the Map interface and provides constant-time performance for b...read more
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Q6. List all languages in sql
Ans. 
List of SQL languages
• MySQL

• Oracle

• PostgreSQL

• Microsoft SQL Server

• SQLite
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Python sql powerbi excel

Q1. They asked me two das questions one is medium and second one is hard..
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Q2. They asked me about Sliding window techniqur and gave a problem to solve
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Q3. They ask u about ur projects
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