ACME Group Interview Questions and Answers

String is immutable, StringBuilder is mutable.

• String is immutable, meaning its value cannot be changed once it is created.

• StringBuilder is mutable, allowing for the modification of its value without creating a new object.

• String concatenation in a loop is more efficient with StringBuilder to avoid creating multiple String objects.

• StringBuilder has methods like append(), insert(), delete(), etc. for modifying its value.

AWS services are a collection of cloud computing services provided by Amazon Web Services.

• Compute services (e.g. EC2, Lambda)

• Storage services (e.g. S3, EBS)

• Database services (e.g. RDS, DynamoDB)

• Networking services (e.g. VPC, Route 53)

• Analytics services (e.g. Redshift, Athena)

• Machine Learning services (e.g. SageMaker)

• Security services (e.g. IAM, KMS)

Angular implementation explanation

• Angular is a popular front-end framework for building web applications

• Uses TypeScript for development

• Components, services, modules, and directives are key concepts in Angular

• Data binding, dependency injection, and routing are important features

• Example: Creating a new component in Angular - ng generate component my-component

Standard objects are pre-built by Salesforce, while custom objects are created by users. Flow is a declarative tool for automating processes, while Process Builder is a visual tool for automating business processes. Triggers are pieces of code that execute before or after specific events in Salesforce.

• Standard objects are pre-built by Salesforce, such as Account, Contact, Opportunity, etc.

• Custom objects are created by users to store specific information unique to their organi...read more

Profiling in Springboot is a way to measure and analyze the performance of an application.

• Profiling helps identify performance bottlenecks and optimize code

• Springboot provides built-in support for profiling through the use of various tools such as VisualVM and JProfiler

• Profiling can be done on both the server-side and client-side of the application

• Profiling can help identify memory leaks, CPU usage, and other performance issues

Thread lifecycle refers to the various stages a thread goes through during its execution.

• A thread is created using the 'new' keyword or by implementing the 'Runnable' interface.

• The thread is started using the 'start()' method.

• During its execution, the thread can be in various states such as 'Runnable', 'Blocked', 'Waiting', etc.

• The thread can be interrupted using the 'interrupt()' method.

• The thread completes its execution when the 'run()' method completes or when it is stoppe...read more