Interview Questions and Answers for 'C' | Search Interview Question

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Q631. What is the difference between try-catch and @ExceptionHandler in Java/Spring Boot?

Spring Boot

Ans. ExceptionHandler is Used to handle at Method level

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Q632. What is the difference between bubble sort using Java and C++ ?

Programming Language

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Q633. Does Hashtable in Java use stack operation ?

Core Java

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Q634. How you can check Object is created or not in case of Singleton using Object class method ?

Design

Ans. Reflections-- setAccesible--avoid using enumns

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Q635. Differences between class not found exception and noclassdef found error ?

Core Java

Ans. ClassNotFoundException is an exception that occurs when we try to load a class at run time using Class.forName() or loadClass() methods and mentioned classes are not found in the classpath.

NoClassDefFoundError is an error that occurs when a particular class is present at compile time, but was missing at run time.

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Q636. Have you ever changed IAM policy ?

Amazon Web Services (AWS)

Ans. Yes I did it for an execution role of a Lambda function to give it write access on S3 bucket.

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Q637. How can we schedule Lambda function to run daily ?

Amazon Web Services (AWS)

Ans. We can schedule that through CloudWatch.

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Q638. How can we make an S3 file public through Java program ?

Amazon Web Services (AWS)

Ans. We can get the object and then can set CannedAcl property as "PublicRead"

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Q639. Can making the S3 bucket public ,makes all objects / files inside as public too ?

Amazon Web Services (AWS)

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Q640. What would you do if you see an error thrown by a lambda function as "Access Denied" while doing something with S3 ?

Amazon Web Services (AWS)

Ans. Just like people , AWS resources too have execution roles or permissions. Seems like in such a situation Lambda function may not have sufficient privileges to perform operations on S3. For example - The execution role of Lambda may just have read permissions on S3 and we may be trying to perform PutObject operation.

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Q641. What is reentrant lock ?

Ans. A reentrant lock is a mutual exclusion mechanism that allows threads to reenter into a lock on a resource (multiple times) without a deadlock situation.

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Q642. Difference between git fetch and git pull ?

Git

Ans. git pull does a git fetch followed by a git merge. git fetch only change the remote tracking but never attempts to make changes to the local.

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Q643. Define Collection

Core Java

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Q644. What is the purpose of rebasing the branch

Git

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Q645. Difference between git init and git clone ?

Git

Ans. "git init" creates an empty repository or can make an existing directory a git repository while "git clone" first internally calls "git init" to create an empty git repository and then copy the data from the specified remote repository.

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Q646. Can we compile multiple type script files together ? How ?

TypeScript

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Q647. How to compile typescript ?

TypeScript

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Q648. What are the features of TypeScript ?

TypeScript

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Q649. What is type script ? What are the advantages of typescript ? How is it different than javascript ?

TypeScript

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Q650. What is the use of map method in typescript ?

TypeScript

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Q651. Can we set specific return type of a method in typescript ?

TypeScript

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Q652. Why type has been deprecated and replaced by interfaces ?

TypeScript

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Q653. Difference between interface and class in typescript ?

TypeScript

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Q654. Difference between interface and type ?

TypeScript

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Q655. What are the different data types in typescript ?

TypeScript

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Q656. Difference between Let and Var ?

TypeScript

Ans. Let creates a variable with a local scope whereas var creates it with a global scope.

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Q657. Is it possible to configure more than one config file in struts ?

Struts

Ans. Yes

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Q658. Without configure ContextLoaderListenerAnd DispatcherServlet how to run spring MVCApplication?

Spring

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Q659. Can you explain spring boot project Architecture?

Spring Boot

Ans. The architecture of a Spring Boot project can be divided into three layers:

Presentation Layer:
This layer is responsible for handling user requests and generating responses. It includes the user interface, which can be a web UI or a RESTful API. Spring Boot provides various options to develop web applications, such as Spring MVC, Thymeleaf, and others.

Service Layer:
This layer contains the business logic of the application. It is responsible for processing the user requests and generating responses. The Service Layer interacts with the Data Access Layer to fetch and store data.

Data Access Layer:
This layer is responsible for interacting with the database or any other external data source. It includes the database model, repositories, and data access objects. Spring Boot provides support for various data access technologies, such as JPA, JDBC, and Spring Data JPA.

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Q660. What is Entity in hibernate?

Hibernate

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