Coforge Senior Java Developer Interview Questions, Process, and Tips

ArrayList is implemented as a resizable array while LinkedList is implemented as a doubly linked list.

• ArrayList provides constant time for accessing elements while LinkedList provides constant time for adding or removing elements.

• ArrayList is better for storing and accessing data while LinkedList is better for manipulating data.

• ArrayList is faster for iterating through elements while LinkedList is faster for adding or

Program to filter employees using Java streams

• Create a list of employees

• Use stream() method to convert list to stream

• Use filter() method to filter employees based on condition

• Use collect() method to convert stream back to list

Spring Boot has various exceptions for different scenarios.

• DataAccessException - for database access errors

• HttpMessageNotReadableException - for errors in HTTP message conversion

• MethodArgumentNotValidException - for validation errors in request parameters

• NoSuchBeanDefinitionException - for errors in bean configuration

• UnauthorizedException - for authentication and authorization errors

Changing annotations on Spring Boot classes can have significant impact on the application.

• Changing annotations can affect the behavior of the application

• Annotations can control the lifecycle of beans, security, caching, etc.

• Removing or modifying annotations can cause runtime errors

• Adding new annotations can introduce new functionality

• Annotations can affect the performance of the application

Setting port number as 0 in Spring Boot for a service

• Setting port number as 0 allows the operating system to choose an available port

• This is useful when running multiple instances of the same service on the same machine

• To set port number as 0 in Spring Boot, add 'server.port=0' to application.properties or application.yml

Java is a popular programming language used for developing various applications. Spring Boot is a framework that simplifies the development of Java applications.

• Java is an object-oriented programming language known for its platform independence and versatility.

• Spring Boot is a framework that simplifies the development of Java applications by providing pre-configured settings and tools.

• Spring Boot allows for rapid devel...read more

Collection framework is a set of classes and interfaces that provide a standard way to store and manipulate groups of objects.

• It provides interfaces like List, Set, and Map for storing collections of objects.

• It includes classes like ArrayList, LinkedList, HashSet, and HashMap for implementing these interfaces.

• Collections framework simplifies the process of storing, retrieving, and manipulating data in Java.