10+ Cloudnine Hospital Interview Questions and Answers

Java programs are executed by the Java Virtual Machine (JVM) which interprets and executes the bytecode generated by the Java compiler.

• Java source code is compiled into bytecode by the Java compiler

• The bytecode is platform-independent and can be executed on any device with a JVM

• The JVM interprets the bytecode and executes the instructions

• The JVM manages memory, handles exceptions, and provides other runtime services

• Example: javac HelloWorld.java -> java HelloWorld

Java is most secured due to its strong memory management, bytecode verification, and security manager.

• Java's strong memory management prevents buffer overflow and other memory-related vulnerabilities.

• Bytecode verification ensures that the code is safe to execute and prevents malicious code from running.

• Security manager allows fine-grained control over access to system resources.

• Java also has a robust set of security APIs and tools for encryption, authentication, and authoriza...read more

A subquery is a query nested within another query, and the LIKE operator is used in SQL to search for a specified pattern in a column.

• A subquery is enclosed in parentheses and executed first before the main query.

• The result of a subquery can be used in comparison with the main query's result.

• The LIKE operator is used with the WHERE clause to search for a specified pattern in a column.

• The LIKE operator allows for wildcard characters such as % (matches any sequence of character...read more

Count the number of repeated words in a given string

• Split the string into words using a delimiter like space

• Create a hashmap to store word frequencies

• Iterate through the words and update the hashmap accordingly

• Count the number of words with frequency greater than 1

Encapsulation, Inheritance, Polymorphism, Abstraction

• Encapsulation: Bundling data and methods that operate on the data into a single unit

• Inheritance: Ability of a class to inherit properties and behavior from another class

• Polymorphism: Ability to present the same interface for different data types

• Abstraction: Hiding the complex implementation details and showing only the necessary features

Database connection in Spring Boot is configured using application.properties or application.yml file.

• Define database connection properties in application.properties or application.yml file

• Use @EnableJpaRepositories annotation to enable JPA repositories

• Use @Entity annotation to define entity classes

• Use @Autowired annotation to inject the DataSource or EntityManager

Abstract class is a class that cannot be instantiated and may contain abstract methods.

• Cannot be instantiated directly

• May contain abstract methods that must be implemented by subclasses

• Can have both abstract and non-abstract methods

• Used for creating a template for other classes to inherit from

Strings are immutable to ensure data integrity and security by preventing accidental or intentional modification.

• Immutable strings prevent accidental changes to data

• Enhances security by preventing data tampering

• Allows for efficient memory management

Arrays are fixed in size and store elements of the same data type, while collections are dynamic in size and can store elements of different data types.

• Arrays have a fixed size, while collections can dynamically resize.

• Arrays store elements of the same data type, while collections can store elements of different data types.

• Arrays use indexes to access elements, while collections use iterators or other methods.

• Examples: Array - int[] numbers = {1, 2, 3}; Collection - List name...read more