Override Method Apex also supports overriding from method, which allows a child class to provide a different implementation for a method that is already implemented in its parent class. When a child class overrides a method, it provides its own implementation of the method, which is used instead of the implementation in the parent class […]

Writing Literals There are a few more things you should know about numeric primitives. When a number is present in the code, it is called a literal. By default, Java assumes you are defining an int value with a numeric literal. In the following example, the number listed is bigger than what fits in an […]

AWS services:  Managed VPN: An IPsec VPN connection between a CGW in a physical datacenter and an AWS-managed virtual private gateway. Software site-to-site VPN: An IPsec VPN connection between a CGW in a physical datacenter and a customer-managed EC2 instance. ExamAlert You can configure multiple managed site-to-site VPN connections, but the maximum aggregate bandwidth of […]

Direct Connect Locations AWS Direct Connect locations are located throughout the world and are not located in AWS facilities like availability zones are. Third-party data centers are used to house the AWS DX routers. Customers contract with service providers or supply their own network equipment located in the same data centers as the AWS DX […]

S3 Standard Infrequent Access (S3 Standard-IA) If you have data you don’t access frequently but still need to retrieve in real time, the S3 Standard-IA storage tier provides an excellent option. If you decide to use this storage tier, consider the following: the files and objects you would store in your S3 bucket would need […]

Getting hands-on with Amazon Polly In this section, you will build a pipeline where you can integrate AWS Lambda with Amazon Polly. The pipeline reads a text file and generates an MP3 file, saving it to another folder in the same bucket. You will monitor the task’s progress in CloudWatch logs. You will begin by […]

Profiles and permission sets Specifying the object-level security access is the main function of profiles (although additional settings are present, such as login hours, IP ranges, and the like, that aren’t in the scope of this exam). By specifying Create, Read, Edit, and Delete access to specific objects, users access to those objects can be […]

Abstract Methods –– An abstract method is a method declared in a class but does not have an implementation in that class. –– Subclasses must provide implementations for all abstract methods. –– An abstract class can also contain non-abstract methods. In the example below, let’s consider an abstract class named Item that represents a generic […]

Understanding Data Types Java applications contain two types of data: primitive types and reference types. In this sec-tion, we discuss the differences between a primitive type and a reference type. Using Primitive Types Java has eight built-­in data types, referred to as the Java primitive types. These eight data types represent the building blocks for […]

Database Selection Selecting a database depends on many factors, and you may have to leverage more than one database for your workload to deliver optimal performance. It all very much depends on the type of data you handle, the type of access to support, the querying capability expected, and additional factors such as latency, scalability, […]