Gazon Communications Full Stack Developer Interview Questions and Answers

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Q1. Sql related ques mege into, rank,dense rank,queries of joins etc.
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Q2. Java 8 related ques optional and stream
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Q1. How to handle exception?
Ans. 
Handle exceptions by using try-catch blocks to gracefully manage errors in code execution.
• Use try-catch blocks to catch exceptions and handle them appropriately.

• Throw custom exceptions when necessary to provide more specific error information.

• Use finally block to execute code that should always run, regardless of whether an exception is thrown.

• Avoid catching generic exceptions like Exception class, instead catch specif...read more
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Q2. What is inheritance?
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Inheritance is a concept in object-oriented programming where a class can inherit attributes and methods from another class.
• Allows for code reusability by creating a new class based on an existing class

• Derived class inherits properties and behaviors of the base class

• Supports the 'is-a' relationship, where a derived class is a specialized version of the base class
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Q1. Round 1 is about basic questions on technology
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Q1. Round is about high level design and data structure questions
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It involves 2 problem solving logical questions

Best way to prefer java, core java and most imp spring boot because many of companies required spring boot now a days

Q1. What is java is the basic question for everyone
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Q2. What is difference between path and classpath variables
Ans. 
Path variable is used to locate executable files while classpath variable is used to locate Java classes.
• Path variable is used by the operating system to locate executable files.

• Classpath variable is used by Java to locate classes and resources.

• Path variable is system-specific while classpath variable is Java-specific.

• Path variable is set by the user while classpath variable is set by the developer.

• Example of path vari...read more
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Q3. What is enum in java
Ans. 
Enum is a special data type in Java used to define a set of constants.
• Enums are used to represent a fixed number of values that do not change.

• They are declared using the enum keyword.

• Each enum constant is an object of the enum type.

• Enums can have constructors, methods, and fields.

• Example: enum Color { RED, GREEN, BLUE }

• Enums can also have values associated with them, like Color.RED(255, 0, 0).
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Q4. What is 2 phase commit
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2 phase commit is a protocol used to ensure distributed transactions are either committed or rolled back.
• Used in distributed systems where multiple databases are involved in a transaction

• Ensures all databases either commit or rollback the transaction

• Involves a coordinator and multiple participants

• Coordinator sends a prepare message to participants, who respond with either commit or abort

• If all participants respond with...read more
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Q5. They can ask questions on your project
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Q6. Is java completely object oriented?
Ans. 
Yes, Java is completely object oriented.
• Java is designed to be completely object oriented.

• All code in Java is written inside classes and objects.

• Java supports encapsulation, inheritance, and polymorphism.

• Java does have some non-object oriented features like primitive data types.

• However, even these can be treated as objects using wrapper classes.
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Q7. What is exception in java?
Ans. 
Exception is an event that occurs during the execution of a program and disrupts the normal flow of instructions.
• Exceptions are objects that are thrown at runtime when an abnormal condition occurs

• Java provides a set of predefined exceptions that can be used to handle errors

• Exceptions can be caught and handled using try-catch blocks

• Unchecked exceptions are those that are not checked at compile-time, while checked except
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Q1. No specific questions they can ask about company only and will talk about package
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Q1. How to optimise fetching 1 lakh entries from db
Ans. 
Use pagination, indexing, caching, and query optimization to fetch 1 lakh entries efficiently from the database.
• Implement pagination to fetch data in smaller chunks

• Create indexes on columns frequently used in queries

• Use caching to store frequently accessed data

• Optimize queries by avoiding unnecessary joins and using appropriate indexes

• Consider using database-specific optimizations like query hints or stored procedures
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