Moar puzzlers! The more we work with Java 8, the more we go into the rabbit hole. Did they add all those streams, lambdas, monads, Optionals and CompletableFutures only to confuse us? It surely looks so! And Java 9 that heads our way brings even more of what we like the most, more puzzlers, of course! In this season we as usual have a great batch of the best Java WTF, great jokes to present them and great prizes for the winners!
Java Puzzlers NG S02: Down the Rabbit Hole as presented at DevNexus 2017Baruch Sadogursky
Moar puzzlers! The more we work with Java 8, the more we go into the rabbit hole. Did they add all those streams, lambdas, monads, Optionals and CompletableFutures only to confuse us? It surely looks so! And Java 9 that heads our way brings even more of what we like the most, more puzzlers, of course! In this season we as usual have a great batch of the best Java WTF, great jokes to present them and great prizes for the winners!
Java Puzzlers NG S02: Down the Rabbit Hole as presented at Devoxx US 2017Baruch Sadogursky
Moar puzzlers! The more we work with Java 8, the more we go into the rabbit hole. Did they add all those streams, lambdas, monads, Optionals and CompletableFutures only to confuse us? It surely looks so! And Java 9 that heads our way brings even more of what we like the most, more puzzlers, of course! In this season we as usual have a great batch of the best Java WTF, great jokes to present them and great prizes for the winners!
Testing Grails 3, the goob (unit), the bad (integration) and the ugly (functi...Alberto De Ávila Hernández
Code available at: https://github.com/albertodeavila/testingGrails3
Do you want to know how to testing Grails 3 apps? Here you will find the following:
- Unit test
- Integration test
- Functional test
All of these, using Spock, Geb, Groovy, Grails and Gradle.
Java 8 Puzzlers as it was presented at Codemash 2017Baruch Sadogursky
We aren’t sure about you, but working with Java 8 made one of the speakers lose all of his hair and the other lose his sleep (or was it the jetlag?). If you still haven’t reached the level of Brian Goetz in mastering lambdas and strings, this talk is for you. And if you think you have, we have some bad news for you, you should attend as well. Baruch and Viktor will show you some surprising, bizarre, and inconceivable parts of Java 8 and make sure that you won’t be (too) surprised when it hits you in production. As with any other puzzlers talk, there will be two speakers, lots of puzzling questions, answers by the audience, T-shirts flying around, and a lot of fun, all for one purpose—to help you better understand Java 8.
Java Puzzlers NG as it was presented at Detroit Java User GroupBaruch Sadogursky
Not sure about you, but working with Java 8 made me lose all of my hair and most of my sleep (or was it the jet lag?). If you still haven’t reached the level of Brian Goetz in mastering lambdas and strings, this session is for you. And if you think you have, here’s some bad news for you: you should attend as well. You’ll see some surprising, bizarre, and inconceivable parts of Java 8, so you won’t be (too) surprised when they hit you in production. Like any other puzzlers session, this one consists lots of puzzling questions, answers from the audience, t-shirts flying around, and a lot of fun—all for one purpose: to make you understand Java 8 better.
Your Robotium tests are flaky? not readable? Come to this Tools in Action and discover Espresso, the new testing library for Android. During this live coding presentation, you will learn how to write beautiful tests and take advantage of Espresso features.
Par Thomas Guérin, consultant chez Xebia, à Devoxx Belgique 2014.
Are statecharts the next big UI paradigm? Luca Matteis
Statecharts (aka state-machines) have been used in UI development for decades. This talk will explain how they work in comparison with other state-management paradigms such as Redux. I will dive into the pros and cons of statecharts and provide in depth examples of how they can be used with React.
You know what to expect by now: funny and puzzling questions about Java 8 and Java 9, JFrog t-shirts are airborne, the usual combo of learning and fun ahead!
Java Puzzlers NG S02: Down the Rabbit Hole as presented at DevNexus 2017Baruch Sadogursky
Moar puzzlers! The more we work with Java 8, the more we go into the rabbit hole. Did they add all those streams, lambdas, monads, Optionals and CompletableFutures only to confuse us? It surely looks so! And Java 9 that heads our way brings even more of what we like the most, more puzzlers, of course! In this season we as usual have a great batch of the best Java WTF, great jokes to present them and great prizes for the winners!
Java Puzzlers NG S02: Down the Rabbit Hole as presented at Devoxx US 2017Baruch Sadogursky
Moar puzzlers! The more we work with Java 8, the more we go into the rabbit hole. Did they add all those streams, lambdas, monads, Optionals and CompletableFutures only to confuse us? It surely looks so! And Java 9 that heads our way brings even more of what we like the most, more puzzlers, of course! In this season we as usual have a great batch of the best Java WTF, great jokes to present them and great prizes for the winners!
Testing Grails 3, the goob (unit), the bad (integration) and the ugly (functi...Alberto De Ávila Hernández
Code available at: https://github.com/albertodeavila/testingGrails3
Do you want to know how to testing Grails 3 apps? Here you will find the following:
- Unit test
- Integration test
- Functional test
All of these, using Spock, Geb, Groovy, Grails and Gradle.
Java 8 Puzzlers as it was presented at Codemash 2017Baruch Sadogursky
We aren’t sure about you, but working with Java 8 made one of the speakers lose all of his hair and the other lose his sleep (or was it the jetlag?). If you still haven’t reached the level of Brian Goetz in mastering lambdas and strings, this talk is for you. And if you think you have, we have some bad news for you, you should attend as well. Baruch and Viktor will show you some surprising, bizarre, and inconceivable parts of Java 8 and make sure that you won’t be (too) surprised when it hits you in production. As with any other puzzlers talk, there will be two speakers, lots of puzzling questions, answers by the audience, T-shirts flying around, and a lot of fun, all for one purpose—to help you better understand Java 8.
Java Puzzlers NG as it was presented at Detroit Java User GroupBaruch Sadogursky
Not sure about you, but working with Java 8 made me lose all of my hair and most of my sleep (or was it the jet lag?). If you still haven’t reached the level of Brian Goetz in mastering lambdas and strings, this session is for you. And if you think you have, here’s some bad news for you: you should attend as well. You’ll see some surprising, bizarre, and inconceivable parts of Java 8, so you won’t be (too) surprised when they hit you in production. Like any other puzzlers session, this one consists lots of puzzling questions, answers from the audience, t-shirts flying around, and a lot of fun—all for one purpose: to make you understand Java 8 better.
Your Robotium tests are flaky? not readable? Come to this Tools in Action and discover Espresso, the new testing library for Android. During this live coding presentation, you will learn how to write beautiful tests and take advantage of Espresso features.
Par Thomas Guérin, consultant chez Xebia, à Devoxx Belgique 2014.
Are statecharts the next big UI paradigm? Luca Matteis
Statecharts (aka state-machines) have been used in UI development for decades. This talk will explain how they work in comparison with other state-management paradigms such as Redux. I will dive into the pros and cons of statecharts and provide in depth examples of how they can be used with React.
You know what to expect by now: funny and puzzling questions about Java 8 and Java 9, JFrog t-shirts are airborne, the usual combo of learning and fun ahead!
Do I need tests when I have the compiler - Andrzej Jóźwiak - TomTom Dev Day 2020Andrzej Jóźwiak
Functional programming returned to the main stream after long years of hiatus. Languages like Haskell, Coq, Agda promise us better code just by using their advanced type systems. Although the dreaded null hides around every corner in Java is it possible to structure our code in a way that illegal states are not representable? Can the type system alone be enough for us to be sure that the code is correct? Do types mean that no tests are required?
During this talk, we will look at examples of code where the types control what code can be written (and there is no other way to do it). We will explore the possibilities to lower the number of unit tests or avoid some of them completely just by using the type system alone.
We will try to find an answer what stronger type systems can give us, what are dependent types and how could they look in Java.
The more we work with Java 8, the more we go into the rabbit hole. Did they add all those streams, lambdas, monads, Optionals and CompletableFutures only to confuse us? It surely looks so! And Java 9 that heads our way brings even more of what we like the most, more puzzlers, of course! In this season we as usual have a great batch of the best Java WTF, great jokes to present them and great prizes for the winners!
Demonstrate some great aspects of Mockito. Made for Mockito v1.8.5.
All examples can be found @
https://github.com/dodozhang21/MockitoExamples
Ying Zhang (Dodo) http://pure-essence.net
This talk was delivered at JavaOne 2013, together with Andrzej Grzesik. We mention the new Date APIs, changes to Collections as well as Streams APIs and of course... Lambdas!
The advancement in technology has greatly influenced the business transactions. The adoption of digital technology has led to automation in the hospitality industry. Business in hospitality industry such as restaurants can be improved with the help of digital systems. The competition in restaurant business have increased with the advancements in food ordering techniques. This project aims to automate the food ordering and billing process in restaurant as well as to improve the dining experience of customers. Here we discuss about the design & implementation of Smart Restaurant ordering system with real time with customer’s feedback for restaurants. The system on user’s table will have all the details of his account as well as menu. The order details from the customer’s table are updated and subsequently sent to kitchen after swiping the RFID card from which the amount will be deducted. The restaurant owner can manage the menu modifications easily. Touch screen provides fast access to any and all types of digital media, with no text bound interface getting in the way. Faster input can mean better service. Touch screens are practical in automation which has become even simpler with advancement in technology.
Spring Certification Questions and Spring Free test are tests created to demonstrate all the functions of our mock exams. You will be able to access ten full questions and will have ten minutes of time for finishing the test.
There are several components you can interact with when you take our mock exams:
Take a look at the progress bar at the top; it will tell how you are progressing through the exam.
Read the question and select only the answers you think are correct by checking the corresponding check box.
Navigate the spring questions using the "Previous" and "Next" buttons.
Mark the spring questions you wish to review later. All the questions you have marked will be listed on the right in the section "marked questions". You will be able to jump directly to the question from this list.
If you want to take a look at the correct answers for a question, just click the "Solution" button. In the solution section you will be able to check your answers as well as find a full explanation of the question.
Keep an eye on the countdown. This will tell you how much time is remaining. When the countdown expires, the test will be automatically submitted.
Once the test is submitted, the "result" section will expand. Here, you will be able to review all the questions of the test. From here, you can also navigate directly to each question.
Generics On The JVM (What you don't know will hurt you)Garth Gilmour
Talk delivered to the London Kotlin Users Group. Covering how generics is implemented on the JVM and the different approaches taken by Java and Kotlin to co/contra variance and the lack of reified types.
DevOps Patterns & Antipatterns for Continuous Software Updates @ NADOG April ...Baruch Sadogursky
So, you want to update the software for your user, be it the nodes in your K8s cluster, a browser on user’s desktop, an app in user’s smartphone or even a user’s car. What can possibly go wrong?
In this talk, we’ll analyze real-world software update fails and how multiple DevOps patterns, that fit a variety of scenarios, could have saved the developers. Manually making sure that everything works before sending an update and expecting the user to do acceptance tests before they update is most definitely not on the list of such patterns.
Join us for some awesome and scary continuous update horror stories and some obvious (and some not so obvious) proven ideas for improvement and best practices you can start following tomorrow.
So, you want to update the software for your user, be it the nodes in your K8s cluster, a browser on user’s desktop, an app in user’s smartphone or even a user’s car. What can possibly go wrong?
In this talk, we’ll analyze real-world software update fails and how multiple DevOps patterns, that fit a variety of scenarios, could have saved the developers. Manually making sure that everything works before sending an update and expecting the user to do acceptance tests before they update is most definitely not on the list of such patterns.
Join us for some awesome and scary continuous update horror stories and some obvious (and some not so obvious) proven ideas for improvement and best practices you can start following tomorrow.
More Related Content
Similar to Java Puzzlers NG S02: Down the Rabbit Hole as it was presented at The Pittsburgh Java Meetup Group
Do I need tests when I have the compiler - Andrzej Jóźwiak - TomTom Dev Day 2020Andrzej Jóźwiak
Functional programming returned to the main stream after long years of hiatus. Languages like Haskell, Coq, Agda promise us better code just by using their advanced type systems. Although the dreaded null hides around every corner in Java is it possible to structure our code in a way that illegal states are not representable? Can the type system alone be enough for us to be sure that the code is correct? Do types mean that no tests are required?
During this talk, we will look at examples of code where the types control what code can be written (and there is no other way to do it). We will explore the possibilities to lower the number of unit tests or avoid some of them completely just by using the type system alone.
We will try to find an answer what stronger type systems can give us, what are dependent types and how could they look in Java.
The more we work with Java 8, the more we go into the rabbit hole. Did they add all those streams, lambdas, monads, Optionals and CompletableFutures only to confuse us? It surely looks so! And Java 9 that heads our way brings even more of what we like the most, more puzzlers, of course! In this season we as usual have a great batch of the best Java WTF, great jokes to present them and great prizes for the winners!
Demonstrate some great aspects of Mockito. Made for Mockito v1.8.5.
All examples can be found @
https://github.com/dodozhang21/MockitoExamples
Ying Zhang (Dodo) http://pure-essence.net
This talk was delivered at JavaOne 2013, together with Andrzej Grzesik. We mention the new Date APIs, changes to Collections as well as Streams APIs and of course... Lambdas!
The advancement in technology has greatly influenced the business transactions. The adoption of digital technology has led to automation in the hospitality industry. Business in hospitality industry such as restaurants can be improved with the help of digital systems. The competition in restaurant business have increased with the advancements in food ordering techniques. This project aims to automate the food ordering and billing process in restaurant as well as to improve the dining experience of customers. Here we discuss about the design & implementation of Smart Restaurant ordering system with real time with customer’s feedback for restaurants. The system on user’s table will have all the details of his account as well as menu. The order details from the customer’s table are updated and subsequently sent to kitchen after swiping the RFID card from which the amount will be deducted. The restaurant owner can manage the menu modifications easily. Touch screen provides fast access to any and all types of digital media, with no text bound interface getting in the way. Faster input can mean better service. Touch screens are practical in automation which has become even simpler with advancement in technology.
Spring Certification Questions and Spring Free test are tests created to demonstrate all the functions of our mock exams. You will be able to access ten full questions and will have ten minutes of time for finishing the test.
There are several components you can interact with when you take our mock exams:
Take a look at the progress bar at the top; it will tell how you are progressing through the exam.
Read the question and select only the answers you think are correct by checking the corresponding check box.
Navigate the spring questions using the "Previous" and "Next" buttons.
Mark the spring questions you wish to review later. All the questions you have marked will be listed on the right in the section "marked questions". You will be able to jump directly to the question from this list.
If you want to take a look at the correct answers for a question, just click the "Solution" button. In the solution section you will be able to check your answers as well as find a full explanation of the question.
Keep an eye on the countdown. This will tell you how much time is remaining. When the countdown expires, the test will be automatically submitted.
Once the test is submitted, the "result" section will expand. Here, you will be able to review all the questions of the test. From here, you can also navigate directly to each question.
Generics On The JVM (What you don't know will hurt you)Garth Gilmour
Talk delivered to the London Kotlin Users Group. Covering how generics is implemented on the JVM and the different approaches taken by Java and Kotlin to co/contra variance and the lack of reified types.
DevOps Patterns & Antipatterns for Continuous Software Updates @ NADOG April ...Baruch Sadogursky
So, you want to update the software for your user, be it the nodes in your K8s cluster, a browser on user’s desktop, an app in user’s smartphone or even a user’s car. What can possibly go wrong?
In this talk, we’ll analyze real-world software update fails and how multiple DevOps patterns, that fit a variety of scenarios, could have saved the developers. Manually making sure that everything works before sending an update and expecting the user to do acceptance tests before they update is most definitely not on the list of such patterns.
Join us for some awesome and scary continuous update horror stories and some obvious (and some not so obvious) proven ideas for improvement and best practices you can start following tomorrow.
So, you want to update the software for your user, be it the nodes in your K8s cluster, a browser on user’s desktop, an app in user’s smartphone or even a user’s car. What can possibly go wrong?
In this talk, we’ll analyze real-world software update fails and how multiple DevOps patterns, that fit a variety of scenarios, could have saved the developers. Manually making sure that everything works before sending an update and expecting the user to do acceptance tests before they update is most definitely not on the list of such patterns.
Join us for some awesome and scary continuous update horror stories and some obvious (and some not so obvious) proven ideas for improvement and best practices you can start following tomorrow.
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https://arxiv.org/abs/2306.08302
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Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
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Cheryl Hung, ochery.com
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The key trends across hardware, cloud and open-source; exploring how these areas are likely to mature and develop over the short and long-term, and then considering how organisations can position themselves to adapt and thrive.
Encryption in Microsoft 365 - ExpertsLive Netherlands 2024Albert Hoitingh
In this session I delve into the encryption technology used in Microsoft 365 and Microsoft Purview. Including the concepts of Customer Key and Double Key Encryption.
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
9. 1. Two entertaining guys on
the stage
2. Funny puzzling questions
3. You think and vote
4.T-shirts are airborne
5. Official twitter hashtag:
#javapuzzlersng
10.
11. Which Java version are you on?
A. Java 7
B. Java 8
C. Java 9
D. Java 6
E. Java 5
F. Java 2
@jbaruch http://jfrog.com/shownotes @gamussa
13. Everything works (or doesn't)
in the latest Java 8 and/or 9 update
@jbaruch http://jfrog.com/shownotes @gamussa
14.
15.
16. public class PerfectRobbery {
private Semaphore bankAccount = new Semaphore(-42);
public static void main(String[] args) {
PerfectRobbery perfectRobbery = new PerfectRobbery();
perfectRobbery.takeAllMoney();
perfectRobbery.checkBalance();
}
public void takeAllMoney(){
bankAccount.drainPermits();
}
public void checkBalance(){
System.out.println(bankAccount.availablePermits());
}
}
A. IllegalArgumentException –can’t create semaphore with negative
B. UnsupportedOperationException –can’t drain when negative
C. 0
D. -42
18. A. IllegalArgumentException –can’t create semaphore with negative
B. UnsupportedOperationException –can’t drain when negative
C. 0
D. -42
public class PerfectRobbery {
private Semaphore bankAccount = new Semaphore(-42);
public static void main(String[] args) {
PerfectRobbery perfectRobbery = new PerfectRobbery();
perfectRobbery.takeAllMoney();
perfectRobbery.checkBalance();
}
public void takeAllMoney(){
bankAccount.drainPermits();
}
public void checkBalance(){
System.out.println(bankAccount.availablePermits());
}
}
22. A. true/true
B. true/false
C. false/true
D. false/false
Collections.emptyList() == Collections.emptyList();
Collections.emptyIterator() == Collections.emptyIterator();
@jbaruch http://jfrog.com/shownotes @gamussa
24. A. true/true
B. true/false
C. false/true
D. false/false
Spliterators.emptySpliterator() == Spliterators.emptySpliterator();
Stream.empty() == Stream.empty();
26. A. true/true
B. true/false
C. false/true
D. false/false
Spliterators.emptySpliterator() == Spliterators.emptySpliterator();
Stream.empty() == Stream.empty();
@jbaruch http://jfrog.com/shownotes @gamussa
27. Even empty Stream has state!
@jbaruch http://jfrog.com/shownotes @gamussa
28.
29. ”Identical”
1. Has the same state
2. Not related to “equals and hashcode”contract
3. Not related to references to objects in memory
@jbaruch http://jfrog.com/shownotes @gamussa
30. List[] twins = new List[2];
Arrays.setAll(twins, ArrayList::new);
A. Absolutely identical empty lists
B. Absolutely identical non-empty lists
C. Non-identical empty lists
D. Non-identical non-empty lists
@jbaruch http://jfrog.com/shownotes @gamussa
34. How single is a Single Abstract Method Interface?
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35. A. WTF?! ’Single’means one,not three!
B. Problem is with partyHard(T),remove it and it will work
C. Problem is the drinkIn methods,removing one of them and it will
work
D. It will work fine! Both partyHard() and drinkIn() are merged in
SingleAndHappy,leaving one abstract method
public interface Single<T> {
default void partyHard(String songName) { System.out.println(songName); }
void partyHard(T songName);
void drinkIn(T drinkName);
void drinkIn(String dringName);
}
@FunctionalInterface
public interface SingleAndHappy extends Single<String> { }
@jbaruch http://jfrog.com/shownotes @gamussa
36.
37. A. WTF?! ’Single’means one,not three!
B. Problem is with partyHard(T),remove it and it will work
C. Problem are the drinkIn methods,removing it will leave one abstract
method
D. Yes! Both partyHard() and drinkIn() are merged in SingleAndHappy,
leaving one abstract method
public interface Single<T> {
default void partyHard(String songName) { System.out.println(songName); }
void partyHard(T songName);
void drinkIn(T drinkName);
void drinkIn(String dringName);
}
@FunctionalInterface
public interface SingleAndHappy extends Single<String> { }
@jbaruch http://jfrog.com/shownotes @gamussa
40. Hacking the bank
☑Bank software written in Java
☑Hack into it
☑Analyze the accounts
@jbaruch http://jfrog.com/shownotes @gamussa
41. Given the code above,which statement is wrong:
A. The Set is ordered by hashcode
B. The order is predictable across multiple runs of the JVM on the same machine
C. The order of elements in Set is not predictable
D. Statements A & B are correct
Set<String> accounts= new HashSet<>(Arrays.asList("Gates", "Buffett", "Bezos", "Zuckerberg"));
System.out.println(”accounts= " + accounts);
@jbaruch http://jfrog.com/shownotes @gamussa
42.
43. Given the code above,which statement is wrong:
A. The Set is ordered
B. The order is predictable across multiple runs of the JVM on the same machine
C. The order of elements in Set is not predictable
D. Statements A & B are correct
Set<String> accounts= new HashSet<>(Arrays.asList("Gates", "Buffett", "Bezos", "Zuckerberg"));
System.out.println(”accounts= " + accounts);
@jbaruch http://jfrog.com/shownotes @gamussa
47. Given the code above,which statement is wrong:
A. The Set is ordered
B. The order is predictable across multiple runs of the JVM on the same machine
C. The order of elements in Set is not predictable
D. Statements A & B are correct
Set<String> accounts = Set.of("Gates", "Buffett", "Bezos", "Zuckerberg");
System.out.println(”accounts= " + accounts);
@jbaruch http://jfrog.com/shownotes @gamussa
50. Given the code above,which statement is wrong:
A. The Set is ordered
B. The order is predictable across multiple runs of the JVM on the same machine
C. The order of elements in Set is not predictable
D. Statements A & B are correct
Set<String> accounts = Set.of("Gates", "Buffett", "Bezos", "Zuckerberg");
System.out.println(”accounts= " + accounts);
@jbaruch http://jfrog.com/shownotes @gamussa
51. private int probe(Object pe) {
int idx = Math.floorMod(pe.hashCode() ^ SALT, elements.length);
while (true) {
E ee = elements[idx];
if (ee == null) {
return -idx - 1;
} else if (pe.equals(ee)) {
return idx;
} else if (++idx == elements.length) {
idx = 0;
}
}
}
@jbaruch http://jfrog.com/shownotes @gamussa
53. What’s correct?
A. If you convert your application to module,classpath
dependencies will still be resolved correctly
B. If one of the dependencies was converted to a module,you
have to declare it in module-info in order to use
C. Once you added the module-info to your project you have to
declare the dependencies twice,in classpath and in module-
info
D. None of the above
@jbaruch http://jfrog.com/shownotes @gamussa
54.
55. What’s correct?
A. If you convert your application to module,classpath
dependencies will still be resolved correctly
B. If one of the dependencies was converted to a module,you
have to declare it in module-info in order to use
C. Once you added the module-info to your project you have to
declare the dependencies twice,in classpath and in module-
info
D. None of the above
@jbaruch http://jfrog.com/shownotes @gamussa
58. A. You killed them all
B. You killed only even ones
C. They all survived
D. You killed only odd ones
E. All answers are correct
static void killThemAll(Collection<Hero> expendables) {
Iterator<Hero> heroes = expendables.iterator();
heroes.forEachRemaining(e -> {
if (heroes.hasNext()) {
heroes.next();
heroes.remove();
}
});
System.out.println(expendables);
}
60. A. You killed them all
B. You killed only even ones
C. They all survived
D. You killed only odd ones
E. All answers are correct
static void killThemAll(Collection<Hero> expendables) {
Iterator<Hero> heroes = expendables.iterator();
heroes.forEachRemaining(e -> {
if (heroes.hasNext()) {
heroes.next();
heroes.remove();
}
});
System.out.println(expendables);
}
63. A. Both work just fine
B. Lambda works,method ref fails
C. Method ref works,lambda fails
D. Won’t compile
@FunctionalInterface
public interface OriginalPredicate<T> {
boolean test(T t);
}
OriginalPredicate<Object> lambda = (Object obj) -> ”adidas".equals(obj);
OriginalPredicate<Object> methodRef = ”adidas"::equals;
64.
65. A. Both work just fine
B. Lambda works,method ref fails
C. Method ref works,lambda fails
D. Not a functional interface,will fail on annotation processing
@FunctionalInterface
Public interface CopyCatPredicate {
<T> boolean test(T t);
}
CopyCatPredicate lambda = (Object obj) -> " adadas".equals(obj);
CopyCatPredicate methodRef = " adadas"::equals;
66.
67. A. Both work just fine
B. Lambda works,method ref fails
C. Method ref works,lambda fails
D. Not a functional interface,will fail on annotation processing
@FunctionalInterface
Public interface CopyCatPredicate {
<T> boolean test(T t);
}
CopyCatPredicate lambda = (Object obj) -> " adadas".equals(obj);
CopyCatPredicate methodRef = " adadas"::equals;
76. filter(new TreeSet<>()::add) filter(i -> new TreeSet<>().add(i))!=
New instance is
created every time!
Instance method is
created once!
@jbaruch http://jfrog.com/shownotes @gamussa
80. A. obvious / obvious
B. obvious / NullPointerException
C. NullPointerException / obvious
D. NullPointerException / NullPointerException
Optional.of("obvious").orElseGet(null);
Optional.empty().map(null).orElse("obvious");
Will never happen
Will never happen
@jbaruch http://jfrog.com/shownotes @gamussa
87. A. All
B. 3 and 4
C. Only 3
D. Other
1. Consumer<String> agentA = s -> System.out.println(s);
Consumer<String> agentB = s -> System.out.println(s);
2. Consumer<String> agentA = System.out::println;
Consumer<String> agentB = System.out::println;
3. Supplier<Consumer<String>> supplier = () -> s -> System.out.println(s);
Consumer<String> agentA = supplier.get();
Consumer<String> agentB = supplier.get();
4. Supplier<Consumer<String>> supplier = () -> System.out::println;
Consumer<String> agentA = supplier.get();
Consumer<String> agentB = supplier.get();
When agentA == agentB?
88. Reuse is only possible for pure functions
Consumers accept parameters == have
state
Supplier in 4 has state –the resolved
method reference
@jbaruch http://jfrog.com/shownotes @gamussa