Java 8 will include many new features including lambdas, default methods on interfaces, and a date/time API. Lambdas allow implementing functional interfaces with expression syntax rather than anonymous classes, and method references allow referring to methods without invoking them. Default methods allow adding new functionality to interfaces without breaking existing implementations. The new date/time API in JSR-310 provides improved date/time handling functionality.
Java is Object Oriented Programming. Java 8 is the latest version of the Java which is used by many companies for the development in many areas. Mobile, Web, Standalone applications.
Presentation on the new features introduced in JDK 8, presented on the 26.02.2013 in Sofia University in front of students and members of the Bulgarian java user group.
Java is Object Oriented Programming. Java 8 is the latest version of the Java which is used by many companies for the development in many areas. Mobile, Web, Standalone applications.
Presentation on the new features introduced in JDK 8, presented on the 26.02.2013 in Sofia University in front of students and members of the Bulgarian java user group.
Presentation provides introduction and detailed explanation of the Java 8 Lambda and Streams. Lambda covers with Method references, default methods and Streams covers with stream operations,types of streams, collectors. Also streams are elaborated with parallel streams and benchmarking comparison of sequential and parallel streams.
Additional slides are covered with Optional, Splitators, certain projects based on lambda and streams
Modern Programming in Java 8 - Lambdas, Streams and Date Time APIGanesh Samarthyam
This presentation provides a comprehensive overview of modern programming in Java. It focuses only on Java 8 features: Lambdas, Streams and Date Time API. It also briefly covers refactoring legacy Java code to Java 8.
Start programming in a more functional style in Java. This is the second in a two part series on lambdas and streams in Java 8 presented at the JoziJug.
Historically concept of Actors has been derived from Erlang and is being used as a Threading model in Scala and AKka.
We can think Actors like two persons who do not talk to each other but communicate via a mailbox
Java 8 is one of the largest upgrades to the popular language and framework in over a decade. This talk will detail several new key features of Java 8 that can help make programs easier to read, write, and maintain. Java 8 comes with many features, especially related to collection libraries. We will cover such new features as Lambda Expressions, the Stream API, enhanced interfaces, and more.
www.denizoguz.com-For an in company JDK 7 orientation I have prepared a presentation which summaries new features of JDK 7. I would like to make it public for everyone who needs it.
Slides from my JAX London 2016 talk, discussing how the new features affect library design. Follows on from the Java SE 8 Best Practices talk - http://www.slideshare.net/scolebourne/java-se-8-best-practices-53975908
Presentation provides introduction and detailed explanation of the Java 8 Lambda and Streams. Lambda covers with Method references, default methods and Streams covers with stream operations,types of streams, collectors. Also streams are elaborated with parallel streams and benchmarking comparison of sequential and parallel streams.
Additional slides are covered with Optional, Splitators, certain projects based on lambda and streams
Modern Programming in Java 8 - Lambdas, Streams and Date Time APIGanesh Samarthyam
This presentation provides a comprehensive overview of modern programming in Java. It focuses only on Java 8 features: Lambdas, Streams and Date Time API. It also briefly covers refactoring legacy Java code to Java 8.
Start programming in a more functional style in Java. This is the second in a two part series on lambdas and streams in Java 8 presented at the JoziJug.
Historically concept of Actors has been derived from Erlang and is being used as a Threading model in Scala and AKka.
We can think Actors like two persons who do not talk to each other but communicate via a mailbox
Java 8 is one of the largest upgrades to the popular language and framework in over a decade. This talk will detail several new key features of Java 8 that can help make programs easier to read, write, and maintain. Java 8 comes with many features, especially related to collection libraries. We will cover such new features as Lambda Expressions, the Stream API, enhanced interfaces, and more.
www.denizoguz.com-For an in company JDK 7 orientation I have prepared a presentation which summaries new features of JDK 7. I would like to make it public for everyone who needs it.
Slides from my JAX London 2016 talk, discussing how the new features affect library design. Follows on from the Java SE 8 Best Practices talk - http://www.slideshare.net/scolebourne/java-se-8-best-practices-53975908
This presentaion provides and overview of the new features of Java 8, namely default methods, functional interfaces, lambdas, method references, streams and Optional vs NullPointerException.
This presentation by Arkadii Tetelman (Lead Software Engineer, GlobalLogic) was delivered at Java.io 3.0 conference in Kharkiv on March 22, 2016.
Automatic Migration of Legacy Java Method Implementations to InterfacesRaffi Khatchadourian
Java 8 is one of the largest upgrades to the popular language and framework in over a decade. In this talk, I will first overview several new, key features of Java 8 that can help make programs easier to read, write, and maintain, especially in regards to collections. These features include Lambda Expressions, the Stream API, and enhanced interfaces, many of which help bridge the gap between functional and imperative programming paradigms and allow for succinct concurrency implementations. Next, I will discuss several open issues related to automatically migrating (refactoring) legacy Java software to use such features correctly, efficiently, and as completely as possible. Solving these problems will help developers to maximally understand and adopt these new features thus improving their software.
Lambda Chops - Recipes for Simpler, More Expressive CodeIan Robertson
While the new Streams API has been a great showcase for lambda methods, there are many other ways this new language feature can be used to make friendlier APIs and more expressive code. Lambdas can be used for a number of tasks which historically required significant boilerplate, type-unsafe constructs, or both. From new ways to express metedata, to emulating Groovy's null-safe navigation operator, we'll take a look at a myriad of ways, big and small, that you can use lambdas to improve APIs and streamline your code. We'll also look at some of the limitations of lambdas, and some techniques for overcoming them.
A session for .Net Conf TLV 30.10.2019 (Tel-Aviv, Israel).
The session describes most of the new features that were added to C# 8.0 and .Net Core 3.
Sample Code can be found here: https://github.com/MoaidHathot/.NET-Conf-TLV-2019
In Java 8, the java.util.function has numerous built-in interfaces. Other packages in the Java library (notably java.util.stream package) make use of the interfaces defined in this package. Java 8 developers should be familiar with using key interfaces provided in this package. This presentation provides an overview of four key functional interfaces (Consumer, Supplier, Function, and Predicate) provided in this package.
Presentation from Riga Dev Day talking about Lambda expressions and the Stream API in JDK8. This session, as the title suggests, goes beyond the basics and discusses some of the different ways you need to think to use a functional style of programming in Java.
Explores and discusses benefits of functional programming in Java and how to program in a functional style. Watch Venkat Subramaniam's talk at https://youtu.be/Ee5t_EGjv0A if you would like to learn more.
Recognize, assess, reduce, and manage technical debtJim Bethancourt
Presents strategies for identifying, assessing, reducing, and managing technical debt at a structural level. Provides both technical and strategic business solutions.
Overview of Bamboo's Continuous Integration and Continuous Delivery features, including branch-per-issue unified development workflow. Also includes supported Operating Systems, Databases, and User Authentication mechanisms.
Presentation at the Houston Java Users Group on cutting edge / state of the art tools that help detect and discover refactoring opportunities and suggest how to fix the problems that are fount.
TROUBLESHOOTING 9 TYPES OF OUTOFMEMORYERRORTier1 app
Even though at surface level ‘java.lang.OutOfMemoryError’ appears as one single error; underlyingly there are 9 types of OutOfMemoryError. Each type of OutOfMemoryError has different causes, diagnosis approaches and solutions. This session equips you with the knowledge, tools, and techniques needed to troubleshoot and conquer OutOfMemoryError in all its forms, ensuring smoother, more efficient Java applications.
Exploring Innovations in Data Repository Solutions - Insights from the U.S. G...Globus
The U.S. Geological Survey (USGS) has made substantial investments in meeting evolving scientific, technical, and policy driven demands on storing, managing, and delivering data. As these demands continue to grow in complexity and scale, the USGS must continue to explore innovative solutions to improve its management, curation, sharing, delivering, and preservation approaches for large-scale research data. Supporting these needs, the USGS has partnered with the University of Chicago-Globus to research and develop advanced repository components and workflows leveraging its current investment in Globus. The primary outcome of this partnership includes the development of a prototype enterprise repository, driven by USGS Data Release requirements, through exploration and implementation of the entire suite of the Globus platform offerings, including Globus Flow, Globus Auth, Globus Transfer, and Globus Search. This presentation will provide insights into this research partnership, introduce the unique requirements and challenges being addressed and provide relevant project progress.
Climate Science Flows: Enabling Petabyte-Scale Climate Analysis with the Eart...Globus
The Earth System Grid Federation (ESGF) is a global network of data servers that archives and distributes the planet’s largest collection of Earth system model output for thousands of climate and environmental scientists worldwide. Many of these petabyte-scale data archives are located in proximity to large high-performance computing (HPC) or cloud computing resources, but the primary workflow for data users consists of transferring data, and applying computations on a different system. As a part of the ESGF 2.0 US project (funded by the United States Department of Energy Office of Science), we developed pre-defined data workflows, which can be run on-demand, capable of applying many data reduction and data analysis to the large ESGF data archives, transferring only the resultant analysis (ex. visualizations, smaller data files). In this talk, we will showcase a few of these workflows, highlighting how Globus Flows can be used for petabyte-scale climate analysis.
Listen to the keynote address and hear about the latest developments from Rachana Ananthakrishnan and Ian Foster who review the updates to the Globus Platform and Service, and the relevance of Globus to the scientific community as an automation platform to accelerate scientific discovery.
Enhancing Research Orchestration Capabilities at ORNL.pdfGlobus
Cross-facility research orchestration comes with ever-changing constraints regarding the availability and suitability of various compute and data resources. In short, a flexible data and processing fabric is needed to enable the dynamic redirection of data and compute tasks throughout the lifecycle of an experiment. In this talk, we illustrate how we easily leveraged Globus services to instrument the ACE research testbed at the Oak Ridge Leadership Computing Facility with flexible data and task orchestration capabilities.
We describe the deployment and use of Globus Compute for remote computation. This content is aimed at researchers who wish to compute on remote resources using a unified programming interface, as well as system administrators who will deploy and operate Globus Compute services on their research computing infrastructure.
In software engineering, the right architecture is essential for robust, scalable platforms. Wix has undergone a pivotal shift from event sourcing to a CRUD-based model for its microservices. This talk will chart the course of this pivotal journey.
Event sourcing, which records state changes as immutable events, provided robust auditing and "time travel" debugging for Wix Stores' microservices. Despite its benefits, the complexity it introduced in state management slowed development. Wix responded by adopting a simpler, unified CRUD model. This talk will explore the challenges of event sourcing and the advantages of Wix's new "CRUD on steroids" approach, which streamlines API integration and domain event management while preserving data integrity and system resilience.
Participants will gain valuable insights into Wix's strategies for ensuring atomicity in database updates and event production, as well as caching, materialization, and performance optimization techniques within a distributed system.
Join us to discover how Wix has mastered the art of balancing simplicity and extensibility, and learn how the re-adoption of the modest CRUD has turbocharged their development velocity, resilience, and scalability in a high-growth environment.
Developing Distributed High-performance Computing Capabilities of an Open Sci...Globus
COVID-19 had an unprecedented impact on scientific collaboration. The pandemic and its broad response from the scientific community has forged new relationships among public health practitioners, mathematical modelers, and scientific computing specialists, while revealing critical gaps in exploiting advanced computing systems to support urgent decision making. Informed by our team’s work in applying high-performance computing in support of public health decision makers during the COVID-19 pandemic, we present how Globus technologies are enabling the development of an open science platform for robust epidemic analysis, with the goal of collaborative, secure, distributed, on-demand, and fast time-to-solution analyses to support public health.
Experience our free, in-depth three-part Tendenci Platform Corporate Membership Management workshop series! In Session 1 on May 14th, 2024, we began with an Introduction and Setup, mastering the configuration of your Corporate Membership Module settings to establish membership types, applications, and more. Then, on May 16th, 2024, in Session 2, we focused on binding individual members to a Corporate Membership and Corporate Reps, teaching you how to add individual members and assign Corporate Representatives to manage dues, renewals, and associated members. Finally, on May 28th, 2024, in Session 3, we covered questions and concerns, addressing any queries or issues you may have.
For more Tendenci AMS events, check out www.tendenci.com/events
Large Language Models and the End of ProgrammingMatt Welsh
Talk by Matt Welsh at Craft Conference 2024 on the impact that Large Language Models will have on the future of software development. In this talk, I discuss the ways in which LLMs will impact the software industry, from replacing human software developers with AI, to replacing conventional software with models that perform reasoning, computation, and problem-solving.
May Marketo Masterclass, London MUG May 22 2024.pdfAdele Miller
Can't make Adobe Summit in Vegas? No sweat because the EMEA Marketo Engage Champions are coming to London to share their Summit sessions, insights and more!
This is a MUG with a twist you don't want to miss.
A Comprehensive Look at Generative AI in Retail App Testing.pdfkalichargn70th171
Traditional software testing methods are being challenged in retail, where customer expectations and technological advancements continually shape the landscape. Enter generative AI—a transformative subset of artificial intelligence technologies poised to revolutionize software testing.
Understanding Globus Data Transfers with NetSageGlobus
NetSage is an open privacy-aware network measurement, analysis, and visualization service designed to help end-users visualize and reason about large data transfers. NetSage traditionally has used a combination of passive measurements, including SNMP and flow data, as well as active measurements, mainly perfSONAR, to provide longitudinal network performance data visualization. It has been deployed by dozens of networks world wide, and is supported domestically by the Engagement and Performance Operations Center (EPOC), NSF #2328479. We have recently expanded the NetSage data sources to include logs for Globus data transfers, following the same privacy-preserving approach as for Flow data. Using the logs for the Texas Advanced Computing Center (TACC) as an example, this talk will walk through several different example use cases that NetSage can answer, including: Who is using Globus to share data with my institution, and what kind of performance are they able to achieve? How many transfers has Globus supported for us? Which sites are we sharing the most data with, and how is that changing over time? How is my site using Globus to move data internally, and what kind of performance do we see for those transfers? What percentage of data transfers at my institution used Globus, and how did the overall data transfer performance compare to the Globus users?
Providing Globus Services to Users of JASMIN for Environmental Data AnalysisGlobus
JASMIN is the UK’s high-performance data analysis platform for environmental science, operated by STFC on behalf of the UK Natural Environment Research Council (NERC). In addition to its role in hosting the CEDA Archive (NERC’s long-term repository for climate, atmospheric science & Earth observation data in the UK), JASMIN provides a collaborative platform to a community of around 2,000 scientists in the UK and beyond, providing nearly 400 environmental science projects with working space, compute resources and tools to facilitate their work. High-performance data transfer into and out of JASMIN has always been a key feature, with many scientists bringing model outputs from supercomputers elsewhere in the UK, to analyse against observational or other model data in the CEDA Archive. A growing number of JASMIN users are now realising the benefits of using the Globus service to provide reliable and efficient data movement and other tasks in this and other contexts. Further use cases involve long-distance (intercontinental) transfers to and from JASMIN, and collecting results from a mobile atmospheric radar system, pushing data to JASMIN via a lightweight Globus deployment. We provide details of how Globus fits into our current infrastructure, our experience of the recent migration to GCSv5.4, and of our interest in developing use of the wider ecosystem of Globus services for the benefit of our user community.
Field Employee Tracking System| MiTrack App| Best Employee Tracking Solution|...informapgpstrackings
Keep tabs on your field staff effortlessly with Informap Technology Centre LLC. Real-time tracking, task assignment, and smart features for efficient management. Request a live demo today!
For more details, visit us : https://informapuae.com/field-staff-tracking/
Code reviews are vital for ensuring good code quality. They serve as one of our last lines of defense against bugs and subpar code reaching production.
Yet, they often turn into annoying tasks riddled with frustration, hostility, unclear feedback and lack of standards. How can we improve this crucial process?
In this session we will cover:
- The Art of Effective Code Reviews
- Streamlining the Review Process
- Elevating Reviews with Automated Tools
By the end of this presentation, you'll have the knowledge on how to organize and improve your code review proces
9. Nashorn
• Replacement for Rhino JavaScript Engine
• Collaboration between Oracle, IBM, and RedHat
• Makes extensive use of invokedynamic
• 20x faster than Rhino
• Much smaller - can run on embedded devices
• Open Sourced
• Project Page:
http://openjdk.java.net/projects/nashorn/
10. Metaspace
• Bye bye PermGen
• Holds class metadata
• Introduced for convergence with JRockit
• MetaSpace OoMEs can happen (when capped)
• Initial size limited by amt of native memory
• May want to update tuning flags
11. JSR 310 – java.time
• All the Java Time classes are immutable and
thread-safe.
• Based on the ISO 8601 calendar system, the de
facto world calendar following the proleptic
Gregorian Rules.
• Support for other calendar systems provided
in java.time.calendar and java.time.temporal
packages.
• Besides classes for dates and times, the API also
has classes for clocks, periods and durations, and
enums for month and day-of-week.
13. Lambdas
• A lambda expression is like a method: it
provides a list of formal parameters and a
body—an expression or block—expressed in
terms of those parameters.
• Expressions:
s -> s.length()
(int x, int y) -> x+y
() -> 42
14. Lambdas
• Blocks:
(x, y, z) -> {
if (true) return x;
else {
int result = y;
for (int i = 1; i < z; i++)
result *= i;
return result;
}
}
15. Typical Use Cases
• Anonymous classes (GUI listeners)
• Runnables / Callables
• Comparator
• Apply operation to a collection via foreach
method
16. SAM Type / Functional Interface
• Single Abstract Method
• A functional interface is an interface that has just
one abstract method, and thus represents a
single function contract. (Can have other
methods with bodies)
• Abstract classes may be considered in the future
• The @FunctionalInterface annotation helps
ensure the Functional Interface contract is
honored
• What happens when you have more than one
abstract method & use @FunctionalInterface?
17.
18. Effectively Final
• For both lambda bodies and inner classes,
local variables in the enclosing context can
only be referenced if they
are final or effectively final.
• A variable is effectively final if its value is not
reassigned after its initialization.
• No longer need to litter code with final
keyword
19.
20. Convert Anonymous Class to Lambdafrom http://learnjavafx.typepad.com/weblog/2013/02/mary-had-a-little-%CE%BB.html
// Anonymous inner class for event handling
.onAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent e) {
anim.playFromStart();
}
})
21. Convert Anonymous Class to Lambda
.onAction((ActionEvent) -> {
anim.playFromStart();
}
})
• The lambda type is inferred by the compiler
as EventHandler<ActionEvent> because
the onAction() method takes an object of
type EventHandler<ActionEvent>.
22. Convert Anonymous Class to Lambda
.onAction((e) -> {
anim.playFromStart();
})
• The parameter in this lambda expression must
be an ActionEvent, because that is the type
specified by the handle() method of
the EventHandler interface.
23. Convert Anonymous Class to Lambda
.onAction(e -> {
anim.playFromStart();
} )
• When a lambda expression has a single
parameter and its type is inferred, the
parentheses are not required
24. Convert Anonymous Class to Lambda
.onAction(e -> anim.playFromStart())
• Because the block of code in our lambda
expression contains only one statement, we
can simplify it even further
25.
26. forEach
• forEach method available on Iterator & Map
interfaces and their implementations
• Allows for internal control of iteration of
elements for possible parallel operation
List<String> names =
Arrays.asList("Alice", "Bob", "Charlie");
names.forEach(e -> { System.out.println(e); });
27. java.util.stream
Classes to support functional-style operations on streams of values
• Stream<T> - A sequence of elements supporting
sequential and parallel bulk ops
• Stream opened by calling
– Collection.stream()
– Collection.parallelStream()
List<String> names =
Arrays.asList("Bob", "Alice", "Charlie");
out(names.stream().filter(e -> e.length() > 4 )
.findFirst().get());
Returns “Alice”
28. java.util.stream
• All other interfaces in stream package
accessible through Stream interface
• Collector<T,R> - A (possibly parallel) reduction
operation that folds input elements into a
mutable result container.
• FlatMapper<T,U> - An operation that maps an
element of type T to zero or more elements of
type U.
29. java.util.function
Functional interfaces provide target types for lambda expressions and method references.
• Consumer<T> - Action to be performed on an object.
• Function<T,R> - transform a T to an R.
• Supplier<T> - A supplier of objects (e.g. factory).
• Predicate<T> - Determines if the input object matches
some criteria.
• Unary/BinaryOperator<T> - An operation upon a single
/ two operand(s) yielding a result.
• Bi(Consumer/Function/Predicate)<T,U(,R)> - Accepts
two input arguments, yields result if specified
30. java.util
• Spliterator<T> - A provider of element
traversal operations for a possibly-parallel
computation.
• Optional<T> - A container object which may or
may not contain a non-null value
– Returned by Stream’s aggregate methods
find*(), reduce(), min(), max()
– Call get() to get the value it’s holding
31. Method & Constructor References
• A method reference is used to refer to a (static
or instance) method without invoking it
• A constructor reference is similarly used to
refer to a constructor without creating a new
instance of the named class or array type.
• Specified with the :: (double colon) operator
32. Method & Constructor References
• Provide a way to refer to a method / constructor
without invoking it
• Examples:
System::getProperty
"abc"::length
String::length
super::toString
ArrayList::new
int[]::new
33.
34. Convert call to Method Reference
public class Test {
static void foo(){}
static {
new Runnable() {
@Override
public void run() {
Test.foo();
}
}.run();
}
}
35. Convert call to Method Reference
public class Test {
static void foo(){}
static {
((Runnable) () -> Test.foo()).run();
}
}
36. Convert call to Method Reference
public class Test {
static void foo(){}
static {
((Runnable) Test::foo()).run();
}
}
37. Use a Method Reference
This
bttnExit.setOnAction(
(actionEvent) -> {
try {
stop();
} catch (Exception e) {
// TODO: add error handling
} });
Can be
bttnExit.setOnAction(this::onExit
ButtonClick);
...
void onExitButtonClick() {
try {
stop();
} catch (Exception e) {
// TODO: add error handling
}
}
38. Use a Constructor Reference
interface Factory<T> { T make(); }
Factory<List<String>> f1 =
ArrayList::<String>new;
• Every time make() is invoked, it will return a
new ArrayList<String>
41. Whatever!
• Method assigned to privileged interface:
public class Main {
public static class NotAutoCloseable {
public void close() throws Exception {
System.out.println("CLOSE");
}
}
public static void main(String... args) throws Exception {
NotAutoCloseable nac = new NotAutoCloseable();
try (AutoCloseable ac = nac::close) {
}
}
}
42. Interface Defender Methods
• Interface methods with bodies
• default keyword
• More graceful API evolution
• Interfaces have no state
• Static methods not inherited
• Can reference abstract method
• Called “Extended Interfaces” if no abstract
methods present
43.
44. Super!
• Extended Interfaces can extend other extended
interfaces
• Methods can be overridden
• Can decorate parent definitions via super
interface I1 { default void method1() {//do stuff}}
interface I2 extends I1{
void default method1() {
super.method1();
//do new stuff
}
}