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[VV97] free Snyk training, free Linux book, CopyOnWriteArrayList, bounded types, comments, giving, emotion vs problem, Redpanda
?????? SNYK Try Hack Me training
This learning path covers the core technical skills that will allow you to succeed as a junior penetration tester. Upon completing this path, you will have the practical skills necessary to perform security assessments against web applications and enterprise infrastructure.
?? Introduction to Cyber Security
?? Introduction to Pentesting
???? Introduction to Web Hacking
?? Burp Suite
?? Network Security
?? Vulnerability Research
?? Metasploit
? Privilege Escalation
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???JAVA CERTIFICATION QUESTION: CopyOnWriteArrayList
Given:
var sList = new CopyOnWriteArrayList<Customer>();
Which of the following statement is correct?
* The CopyOnWriteArrayList class is not thread-safe and does not prevent interference among concurrent threads.
* The CopyOnWriteArrayList class’s iterator reflects all additions, removals, or changes to the list since the iterator was created.
* The CopyOnWriteArrayList class is a thread-safe variant of ArrayList where all mutative operations are implemented by making a fresh copy of the underlying array.
* Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are supported and do not throw UnsupportedOperationException.
* The CopyOnWriteArrayList class does not allow null elements.
#java #certificationquestion #ocp
Incorrect: The CopyOnWriteArrayList class is thread-safe and is designed to prevent interference among concurrent threads by creating a fresh copy of the underlying array for each mutative operation.
Incorrect: The iterator of a CopyOnWriteArrayList does not reflect any additions, removals, or changes to the list since the iterator was created. It provides a snapshot of the list at the time of its creation.
Incorrect: Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are not supported. Attempting to perform these operations will result in an UnsupportedOperationException.
Incorrect: The CopyOnWriteArrayList class does allow null elements. It permits all elements, including null.
???JAVA CERTIFICATION QUESTION: Bounded type parameters
Which methods compile?
A)
public List<? super IOException> getListSuper() {
return new ArrayList<Exception>();
}
B)
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}
C)
public List<? extends IOException> getListExtends() {
return new ArrayList<Exception>();
}
D)
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}
#java #certificationquestion #ocp
The methods that will compile are:
A)
This method compiles because Exception is a super of IOException, and the list can contain IOException and its superclasses.
D)
This method compiles because FileNotFoundException is a subclass of IOException, and the list can contain IOException and subclasses of IOException.
Methods A) and C) will not compile because they attempt to return a list with a type that is not compatible with the bounded wildcard.
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In A), Exception is not a subclass of IOException, and in C), Exception is not a subclass of IOException either.
The wildcard bounds must be respected for the code to compile.
Bounded types in Java generics allow you to specify constraints on the types that can be used with a generic class or method.
They are denoted by <? extends Type> for upper bounds (Type and subclasses of Type) and <? super Type> for lower bounds (Type and superclasses of Type).
This ensures type safety and flexibility in your code.
??? POLL: Do you comment your code? YES/ NO/ EXCEPTIONALLY
According to Uncle Bob :
“Truth can only be found in one place: the code.”
“A long descriptive name is better than a short enigmatic name. A long descriptive name is better than a long descriptive comment.”
“Every time you write a comment, you should grimace and feel the failure of your ability of expression.”
“Redundant comments are just places to collect lies and misinformation.”
“Don’t Use a Comment When You Can Use a Function or a Variable”
??The gift of giving
Want to raise your own happiness level?
Studies show that performing acts of kindness benefits both sides - not just those on the receiving end.
To take charge of your happiness, start with a kind gesture towards one person a day.
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Is nothing going according to plan? ??
React to the problem?, not to stress?.
When you make the emotion your focus, you get tunnel vision????. And you're prone to poor decisions. ??
To dial down the emotions, you can imagine the challenge is happening to a friend at a different company.??♂?
#teamwork #emotion #reaction
REDPANDA: Kafka killer?
?? RedPanda is an emerging data streaming platform that offers compatibility with the Kafka protocol. It’s designed for high performance and simplicity, focusing on low latency and high throughput. RedPanda is written in C++ and boasts a different internal architecture than Apache Kafka, which is Java-based.
?? Kafka, on the other hand, is a well-established platform known for its robustness and large ecosystem. It’s suitable for large-scale and complex deployments, offering native stream processing capabilities.
Here are some key points to consider:
?? Performance: RedPanda delivers at least 10x faster tail latencies than Apache Kafka and uses up to 3x fewer nodes to achieve this.
??Architecture: While both are distributed pub/sub platforms, RedPanda has a simpler architecture designed for performance.
?? Ecosystem: Kafka has a larger community and more integrations, making it a go-to choice for many developers.
?? Use Cases: Both platforms are scalable and provide low latency, but RedPanda may benefit more in environments where operational efficiency is key.
In conclusion, if you’re looking for a high-performance alternative to Kafka with Kafka API compatibility, RedPanda could be a great choice. However, if you need the robustness of Kafka’s ecosystem and native stream processing capabilities, Kafka might be the better option.
Key Takeaways:
1?? RedPanda offers superior performance with lower latency.
2?? Kafka provides a richer ecosystem and native stream processing.
3?? Choose based on your specific use case and performance requirements.
Tom said:
We're seeing more and more separation between the Kafka protocol and the underlying implementation. I love this trend as it leads to so many more options in terms of Kafka providers functionality. As Kafka expands into the analytics world with Streambased and Confluent's tableflow I expect to see the split between protocol and implementation widen even further. Exciting times!
#kafka #redpanda #streaming #platform
Kiddo wants a switch ??: chill out, poppa is a network engineer ??
Senior Java Architect and Developer | Founder JavaLabs | Cambridge Master MCA / AI PhD
8 个月Thanks Tintin