What is Amazon Elastic Block Store (EBS)? Amazon Elastic Block Store (EBS) is an easy to use, high performance block storage service designed for use with Amazon Elastic Compute Cloud (EC2) for both throughput and transaction intensive workloads at any scale What are the features of Amazon EBS? EBS volumes are created in a specific […]
AWS Certified Solutions Architect – EFS Study Questions
General What is mount target? Can you mount an EFS file system in more than one VPC at a time? Can you use EFS file system in multiple VPCs at a time? Can EC2 instances in one VPC can access EFS file systems in another VPC? If yes, how do you do it? Can EFS […]
The AWS Certified Solutions Architect – S3 Study Questions
What are the S3 core concepts?https://docs.aws.amazon.com/AmazonS3/latest/dev/Introduction.html#CoreConcepts What are the bucket properties? https://docs.aws.amazon.com/AmazonS3/latest/user-guide/view-bucket-properties.html What is server access logging?https://docs.aws.amazon.com/AmazonS3/latest/dev/ServerLogs.html#server-access-logging-overview Which HTTP status code is generated for successful S3 uploads? Control access to buckets using bucket ACL or Bucket Policies. What is the difference between them? What is the benefits of the consolidated billing?https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/consolidated-billing.html Are S3 objects are […]
The AWS Certified Solutions Architect – API Gateway Study Questions
With what backends can Amazon API Gateway communicate? Can you use the lambda function from another account for an API Gateway? What is VPC link is used for? You create an endpoint to your VPC by setting up a VPC link between X and Y? How do you improve the API performance? What are the […]
Java SE 8/11 Programmer II Exam Series: Concurrency (Part 1)
Introduction This post is currently in progress… In this post, we will look at the exam objective; create worker threads using Runnable, Callable, and use an ExecutorService to concurrently execute tasks. Note that this is also a part of the Java SE 11 Programmer II Certification. Runnable Interface Runnable interface Usages of Runnable interface Creating a […]
Java SE 8/11 Programmer II Exam Series: Exception Handling and Assertions
Introduction In this post, we will look at the following exam objectives. Note that this is also a part of the Java SE 11 Programmer II Certification. Use the try-with-resources construct Create and use custom exception classes Test invariants by using assertions Use the try-with-resources construct The new try-with-resources statement automatically closes all resources opened […]
Java SE 8/11 Programmer II Exam Series: Internationalization and Localization
Introduction In this post, we will look at how to add internationalization and localization to the Java application. We will learn how to pick a locale, create and use properties files in different languages, and to format the numbers. Note that the localization is also a part of the Java SE 11 Programmer II Certification. […]
Java SE 8/11 Programmer II Exam Series: Advanced Stream Pipeline Concepts
Introduction In this section, we will cover advanced stream pipeline concepts in Java 8. We will analyze chaining Optionals, predefined collectors, and learn how to use groupingBy, partitioningBy, and mapping methods. Chaining Optionals Chaining optionals help eliminate the nested if-statements for Optional variables. The function below prints the virus name if it contains Covid-19 without […]
Java SE 8/11 Programmer II Exam Series: Primitive Streams
Introduction In this post, we will cover creating primitive streams, using Optional types with primitives, and summarizing statistics in a single pass. Primitive Streams There are three types of primitive streams: IntStream (int, short, byte, and char), LongStream (long), and DoubleStream (double and float). Creating Primitive Streams Creating primitive streams is the same as a […]
Java SE 8/11 Programmer II Exam Series: Streams
Introduction In this post, we will cover the streams in Java 8. We will discover the three parts of the pipeline: source, terminal, and intermediate operations. What is a stream pipeline? Stream operations are divided into intermediate and terminal operations and are combined to form stream pipelines. A stream pipeline consists of a source; followed by zero or more intermediate […]