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[V30] windows11 book, record deserialization, instant repository, Java20 release, React versus Angular, navigation shortcuts, Scrum empiricism
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???JAVA CERTIFICATION QUESTION: record deserialization
Imagine you are given the following enum and record:
enum Gender {
MALE( "M" ),
FEMALE( "F" ),
OTHER;
Gender() {
System.out.print( "Gender " );
}
Gender( String s ) {
System.out.print( "GenderS " );
}
}
and
record Person(int age, String name, Gender g) implements Serializable {
Person() {
this( 0, "", Gender.OTHER );
System.out.print( "Person " );
}
Person {
System.out.print( "PersonC " );
}
}
Previously an instance of Person was constructed like the following and serialized to a file:
var v = new Person(60, "John Doe", Gender.MALE);
What might be printed to the console when a program deserializes the contents of the file mentioned above? Choose two.
Answer:
This question investigates the mechanisms of deserialization for both enum types and records.
When a record is deserialized, each of the attributes—in this case, the age, name, and gender attributes—must be deserialized to their respective objects or values first.
These attributes are then passed to the canonical constructor of the record.?
No output is printed in handling the int age and the String name attributes, but it’s possible that output might be printed for Gender.
For the Gender enum, there are now two distinct possibilities:
First: the enum has not been fully prepared.
In this situation, expect the three instances (MALE, FEMALE,OTHER) to be initialized using their appropriate constructors.
So, in this situation, you will see GenderS GenderS Gender as the output, preceding any output referring to Person.
Secondly: the Gender type has been fully prepared before an instance of Person is deserialized.
So, no messages related to Gender will be output by the deserialization process.
Once the enum is fully prepared, deserialization of the record type can proceed.
Note that for record: the (compact) canonical constructor for a record type is invoked to perform the initialization of the newly allocated object.
So, you will see the message PersonC printed as output.
Because you might or might not see GenderS GenderS Gender, and you will see PersonC in the output, the two valid answers are
PersonC
GenderS GenderS Gender PersonC
?
???? SPRING CERTIFICATION QUESTION: What is an "instant repository"? (hint: recall Spring Data)???
?Answer:???
Instant repository term refers to the dynamic creation of a repository implementation.
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Such functionality is offered by the 'spring-data-jpa' module.???
???In order to utilize this functionality the following steps must be taken:???
- Configuration class has also been marked with "Enable[Jpa]Repositories" annotation.???
- custom repository interface has to extend the Repository interface, or has to be marked with RepositoryDefinition annotation.?
CrudRepository, JpaRepository, and PagingAndSortingRepository in Spring Data????https://lnkd.in/gd5zi4zZ
?
??? JAVA 20 release: 21 March 2023
The upcoming Java Development Kit (JDK) 20 will introduce a vector API feature, despite the initial set of features being frozen at six capabilities. The vector API enables reliable runtime compilation of optimal vector instructions for supported CPU architectures, resulting in superior performance. The other six features for JDK 20 are either in the incubation or preview stage and include scoped values, record patterns, pattern matching, foreign function and memory API, virtual threads, and structured concurrency. JDK 20 is set to be a short-term feature release, with only six months of support, while JDK 21 will be a long-term support release backed by multiple years of support. Capabilities still under consideration for Java include universal generics, string templates, sequenced collections, and an asynchronous stack trace VM API.
?
????How to choose between React and Angular?
React and Angular are both popular and widely used JavaScript frameworks for developing web applications. The choice between them depends on various factors, such as your project requirements, your team's expertise, and your personal preference. Here are some considerations that can help you make a decision:
In summary, both React and Angular have their strengths and weaknesses, and the choice between them depends on your project requirements, your team's expertise, and your personal preference. It's important to evaluate these factors carefully before making a decision.
?
IntelliJ Navigation Shortcuts ????
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SCRUM: Empiricism ??, the act of making decisions based on what is
Empiricism is the act to do the best we can with what we have ??.
A Product Owner plans ?? a release based on all current information.
The Product Owner’s job is to assess what is possible given the Team’s capabilities, and to make the best decisions to reach the desired goal ??.?
Sometimes the goal will be reached but in a way different from what the Product Owner initially intended.
This is empiricism in action. ??
The team selects what it believes it can do over the upcoming Sprint and commits to it.
However, the word "commit" is often misused as a guarantee, which affects the quality of the outcome ?? ♂?.?
Using "forecast" instead of "commit" helps to clarify that a commitment in Scrum is a pledge to do the best with what we have.
So when the Team selects Product Backlog Items in a Sprint Planning meeting, it forecasts to do it during the Sprint.?
?
????? Chuck
Chuck Norris can unit-test an entire application with a single assert.
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