One Method to Rule Them All: Map.merge()
It is a rare case to read an article explaining a single method in JDK, but this one does it pretty well, it’s about Map.merge(). This is probably the most versatile operation in the key-value universe. But it's also rather obscure and rarely used.
#java #junior #middle
https://dzone.com/articles/one-method-to-rule-them-all-mapmerge
It is a rare case to read an article explaining a single method in JDK, but this one does it pretty well, it’s about Map.merge(). This is probably the most versatile operation in the key-value universe. But it's also rather obscure and rarely used.
#java #junior #middle
https://dzone.com/articles/one-method-to-rule-them-all-mapmerge
dzone.com
One Method to Rule Them All: Map.merge() - DZone Java
In this post, we take a closer look at one important method that is rather obscure and rarely used — map.merge() and how to implement it in your projects.
Scrum - The Most Popular Agile Methodology (Refcard)
Scrum is a framework that allows people to productively and creatively deliver products of the highest possible value. This refcard explores the details of Scrum, including theory, values, roles, and events. It also includes a sample of a popular approach to deliver Integrated Increments in a scaled environment.
#management #scrum #junior #middle #senior
https://dzone.com/refcardz/scrum
Scrum is a framework that allows people to productively and creatively deliver products of the highest possible value. This refcard explores the details of Scrum, including theory, values, roles, and events. It also includes a sample of a popular approach to deliver Integrated Increments in a scaled environment.
#management #scrum #junior #middle #senior
https://dzone.com/refcardz/scrum
dzone.com
Scrum - DZone Refcards
Scrum is an iterative, incremental software development framework commonly used with Agile software development. It uses one or more cross-functional, self-organizing teams of about seven people each. Scrum teams use fixed length iterations (called Sprints)…
Beware of Computation in static {} Initializer
It’s a quite common practice to prepare immutable data during class initialization and save the results in static final fields. In fact, this is exactly what static initializers are designed for.
However you should be careful using it as it can cause significant performance degradation in new JDK versions as shown in this article.
#java #bug #performance #middle #senior
https://pangin.pro/posts/computation-in-static-initializer
It’s a quite common practice to prepare immutable data during class initialization and save the results in static final fields. In fact, this is exactly what static initializers are designed for.
However you should be careful using it as it can cause significant performance degradation in new JDK versions as shown in this article.
#java #bug #performance #middle #senior
https://pangin.pro/posts/computation-in-static-initializer
pangin.pro
Beware of computation in static initializer
Even though it's a common practice to prepare data in static initializers in Java, this can have a dramatic performance impact.
Immutable Data Structures in Java
As part of some coding interviews, the topic of immutability sometimes comes up. There seems to be a bit of a misunderstanding on the concept of immutability, where developers often believe that having a ‘final’ reference is enough to make an object immutable. This blogpost dives a bit deeper in immutable references and immutable data structures. Take a look!
#java #immutability #kotlin #scala #junior #middle
https://www.jworks.io/immutable-data-structures-in-java/
As part of some coding interviews, the topic of immutability sometimes comes up. There seems to be a bit of a misunderstanding on the concept of immutability, where developers often believe that having a ‘final’ reference is enough to make an object immutable. This blogpost dives a bit deeper in immutable references and immutable data structures. Take a look!
#java #immutability #kotlin #scala #junior #middle
https://www.jworks.io/immutable-data-structures-in-java/
Memory Footprint of the JVM
The JVM can be a complex beast. Thankfully, much of that complexity is under the hood, and we as application developers and deployers often don’t have to worry about it too much. With the rise of container-based deployment strategies, one area of complexity that needs some attention is the JVM’s memory footprint. In this post you can see the two kinds of memory, the differences between them, native memory areas, JVM sizing and what does this all mean for Spring, so be sure to check it out!
#jvm #performance #memory #spring #middle #senior
https://spring.io/blog/2019/03/11/memory-footprint-of-the-jvm
The JVM can be a complex beast. Thankfully, much of that complexity is under the hood, and we as application developers and deployers often don’t have to worry about it too much. With the rise of container-based deployment strategies, one area of complexity that needs some attention is the JVM’s memory footprint. In this post you can see the two kinds of memory, the differences between them, native memory areas, JVM sizing and what does this all mean for Spring, so be sure to check it out!
#jvm #performance #memory #spring #middle #senior
https://spring.io/blog/2019/03/11/memory-footprint-of-the-jvm
Memory footprint of the JVM
Level up your Java code and explore what Spring can do for you.
The Open-Closed Principle at an Architectural Level
If you are familiar with the SOLID principles for class design in OOP and if you have ever wondered if you can use them, for example the Open-Closed Principle, when designing the architecture of a system. The Open-Closed Principle, with microservices? Madness! Well, maybe not. Let's dive into it and check it out.
#architecture #middle #senior
https://dzone.com/articles/the-open-closed-principle-at-an-architectural-leve
If you are familiar with the SOLID principles for class design in OOP and if you have ever wondered if you can use them, for example the Open-Closed Principle, when designing the architecture of a system. The Open-Closed Principle, with microservices? Madness! Well, maybe not. Let's dive into it and check it out.
#architecture #middle #senior
https://dzone.com/articles/the-open-closed-principle-at-an-architectural-leve
DZone
The Open-Closed Principle at an Architectural Level
An architect gives a tutorial on how devs and architects can work with the Open-Closed Principle when designing the architecture of microservices-based system.
An Illustrated Guide to Kubernetes Networking
You’ve been running a bunch of services on a Kubernetes cluster and reaping the benefits. Or at least, you’re planning to. Even though there are a bunch of tools available to setup and manage a cluster, you’ve still wondered how it all works under the hood. And where do you look if it breaks? There are a lot of moving parts, and knowing how they all fit in and work together is a must, if you want to be ready for failures read this article!
#kubernetes #containers #middle #senior
https://morioh.com/p/ecb38c8342ba/an-illustrated-guide-to-kubernetes-networking
You’ve been running a bunch of services on a Kubernetes cluster and reaping the benefits. Or at least, you’re planning to. Even though there are a bunch of tools available to setup and manage a cluster, you’ve still wondered how it all works under the hood. And where do you look if it breaks? There are a lot of moving parts, and knowing how they all fit in and work together is a must, if you want to be ready for failures read this article!
#kubernetes #containers #middle #senior
https://morioh.com/p/ecb38c8342ba/an-illustrated-guide-to-kubernetes-networking
Morioh
Everything You Need to Know About Kubernetes Networking
Kubernetes networking allows Kubernetes components to communicate with each other and with other applications. Networking with Kubernetes allows administrators to move workloads across private, public, and hybrid cloud infrastructures. Kubernetes (sometimes…
Var and Language Design in Java
Another great article by our colleague Peter Verhas.
The var predefined type introduced in Java 10 lets you declare local variables without specifying the variable type when you assign a value to it. In the following article, you will learn everything you need to know about var in Java as well as what to expect in the future.
#java #middle
https://dzone.com/articles/var-and-language-design-in-java
Another great article by our colleague Peter Verhas.
The var predefined type introduced in Java 10 lets you declare local variables without specifying the variable type when you assign a value to it. In the following article, you will learn everything you need to know about var in Java as well as what to expect in the future.
#java #middle
https://dzone.com/articles/var-and-language-design-in-java
dzone.com
Var and Language Design in Java - DZone Java
This article takes a closer look at the var predefined type in Java, what it is, what it does, and what one dev predicts it will look like in the future.
A Beginner’s Guide to Java Programming Nightmares
New developers make beginner’s mistakes. A way out of these technological nightmares depends on how well you can follow your own coding processes. Here are explored some of the most common Java mistakes and their solutions with a tour of the horrors of the author’s own early code.
#java #junior #middle
https://jaxenter.com/java-programming-nightmares-156749.html
New developers make beginner’s mistakes. A way out of these technological nightmares depends on how well you can follow your own coding processes. Here are explored some of the most common Java mistakes and their solutions with a tour of the horrors of the author’s own early code.
#java #junior #middle
https://jaxenter.com/java-programming-nightmares-156749.html
JAXenter
A beginner’s guide to Java programming nightmares - JAXenter
Georgi Minkov explores some of the more common Java mistakes and their solutions with a tour of the horrors of his own early code.
Definitive Guide To Java 12
Java 12 will be released in a few days and here’s everything you need to know about it. Be it switch expressions, the teeing collector, improved start time thanks to the default CDS archive, or better memory usage due to garbage collection improvements – you will see each feature presented as well as migration options.
#java #java12 #middle #senior
https://blog.codefx.org/java/java-12-guide/
Java 12 will be released in a few days and here’s everything you need to know about it. Be it switch expressions, the teeing collector, improved start time thanks to the default CDS archive, or better memory usage due to garbage collection improvements – you will see each feature presented as well as migration options.
#java #java12 #middle #senior
https://blog.codefx.org/java/java-12-guide/
blog@CodeFX
Definitive Guide To Java 12 - blog@CodeFX
Detailed Java 12 guide: migration, versions; switch expressions, teeing collectors, indenting/transforming Strings (and more); default CDS, Shenandoah, G1.
Java 12: Mapping with Switch Expressions
Java 12 comes with “preview” support for “Switch Expressions”. In this article, you will be looking at the new feature and how it can be used in conjunction with some common Stream operations. Jump in to learn how you can make your code even better with Streams and Switch Expressions!
https://www.javacodegeeks.com/2019/03/java-12-mapping-with-switch-expressions.html
#java #java12 #middle #senior
Java 12 comes with “preview” support for “Switch Expressions”. In this article, you will be looking at the new feature and how it can be used in conjunction with some common Stream operations. Jump in to learn how you can make your code even better with Streams and Switch Expressions!
https://www.javacodegeeks.com/2019/03/java-12-mapping-with-switch-expressions.html
#java #java12 #middle #senior
Java Code Geeks
Java 12: Mapping with Switch Expressions - Java Code Geeks - 2023
Interested to learn about Switch Expressions? Check our article looking at the new Java 12 feature “Switch Expressions” ..
20 Examples of Using Java’s CompletableFuture
Java 8's CompletableFuture is a versatile tool to have. Here are 20 examples of how you can use it in your code for the best effect. Be sure to check them out!
#java #java8 #middle #senior
https://dzone.com/articles/20-examples-of-using-javas-completablefuture
Java 8's CompletableFuture is a versatile tool to have. Here are 20 examples of how you can use it in your code for the best effect. Be sure to check them out!
#java #java8 #middle #senior
https://dzone.com/articles/20-examples-of-using-javas-completablefuture
DZone
20 Examples of Using Java’s CompletableFuture
For a better understanding of the CompletionStage API, let's look at 20 examples of CompletableFuture in action, both synchronously and asynchronously.
Continuous Profiling in Production: What, Why and How
Richard Warburton and Sadiq Jaffer talk about the ins and outs of profiling in a production system, the different techniques and approaches that help understand what’s really happening with a system. This helps solve new performance problems, regressions and undertake capacity planning exercises.
#tools #profiling #middle #senior
https://www.infoq.com/presentations/cotinuous-profiling-production
Richard Warburton and Sadiq Jaffer talk about the ins and outs of profiling in a production system, the different techniques and approaches that help understand what’s really happening with a system. This helps solve new performance problems, regressions and undertake capacity planning exercises.
#tools #profiling #middle #senior
https://www.infoq.com/presentations/cotinuous-profiling-production
InfoQ
Continuous Profiling in Production: What, Why and How
Richard Warburton and Sadiq Jaffer talk about the ins and outs of profiling in a production system, the different techniques and approaches that help understand what’s really happening with a system. This helps solve new performance problems, regressions…
Explore the New Java Garbage Collectors
The GC topic is still trendy especially considering the variety of Java application workloads and can have significant impact on performance.
The last two releases of Java introduced three new GCs. We'll take a look at each of them and what they add to the ecosystem.
#java #gc #middle #senior
https://dzone.com/articles/java-garbage-collection-3
The GC topic is still trendy especially considering the variety of Java application workloads and can have significant impact on performance.
The last two releases of Java introduced three new GCs. We'll take a look at each of them and what they add to the ecosystem.
#java #gc #middle #senior
https://dzone.com/articles/java-garbage-collection-3
DZone
Java Garbage Collection
Learn everything you need to know about the newest garbage collectors to the JVM, including the Epsilon GC, ZGC, and Shenandoah.
Box Old Objects to Be Autoclosable
Since Java 7 we can use try-with-resources and have any object automatically closed that implements the Autocloseable interface. But some of the classes need some wrap-up but are not Autocloseable. In this article Peter Verhas is sharing a nice tip how we can close such resources in very simple way! Check it out!
#java #junior #middle
https://javax0.wordpress.com/2019/05/22/box-old-objects-to-be-autoclosable/
Since Java 7 we can use try-with-resources and have any object automatically closed that implements the Autocloseable interface. But some of the classes need some wrap-up but are not Autocloseable. In this article Peter Verhas is sharing a nice tip how we can close such resources in very simple way! Check it out!
#java #junior #middle
https://javax0.wordpress.com/2019/05/22/box-old-objects-to-be-autoclosable/
Java Deep
Box old objects to be autoclosable
Since Java 7 we can use try-with-resources and have any object automatically closed that implements the Autocloseable interface. If the resource is Autocloseable. Some of the classes need some wrap…
Excursions into Deduplication
For many workloads strings can be the most significant contributor to memory footprint.
When are Strings deduplicated? How can you find out whether they are of any benefit in your application? How much does it cost in terms of CPU?
This article will guide you how to easily find the answers to the questions above.
#java #jvm #middle #senior
https://www.javaspecialists.eu/archive/Issue270.html
For many workloads strings can be the most significant contributor to memory footprint.
When are Strings deduplicated? How can you find out whether they are of any benefit in your application? How much does it cost in terms of CPU?
This article will guide you how to easily find the answers to the questions above.
#java #jvm #middle #senior
https://www.javaspecialists.eu/archive/Issue270.html
www.javaspecialists.eu
[JavaSpecialists 270] - Excursions into Deduplication
When are Strings deduplicated? How can we find out whether they are of any benefit in our application? How much does it cost in terms of CPU? We try to show you how we can get this from the deduplication statistics provided by the JVM.
Concurrent programming: Two techniques to avoid shared state
Most certainly the more you learn about multi-threaded programming, the harder it gets. Coordinating multiple threads modifying the same data is complicated. In the following article, you are going to explore two techniques that can help you: Copy before modification and Asynchronous modification using a single thread.
#java #concurrency #middle
http://vmlens.com/articles/cp/2_techniques_to_avoid_shared_state/
Most certainly the more you learn about multi-threaded programming, the harder it gets. Coordinating multiple threads modifying the same data is complicated. In the following article, you are going to explore two techniques that can help you: Copy before modification and Asynchronous modification using a single thread.
#java #concurrency #middle
http://vmlens.com/articles/cp/2_techniques_to_avoid_shared_state/
Immutable Collections In Java – Not Now, Not Ever
In JDK terminology, immutable and unmodifiable have shifted over the last few years. At first, the term immutable was used for the collections returned by Java 9’s collection factory methods. But will a method that prints all elements in an immutable collection always have the same output? Yes? No? What’s An Immutable Collection? Is immutability a feature? Can Unmodifiable And Immutable Collections Be Retrofitted? Find out now!
#java #jvm #jdk #architecture #middle
https://blog.codefx.org/java/immutable-collections-in-java/
In JDK terminology, immutable and unmodifiable have shifted over the last few years. At first, the term immutable was used for the collections returned by Java 9’s collection factory methods. But will a method that prints all elements in an immutable collection always have the same output? Yes? No? What’s An Immutable Collection? Is immutability a feature? Can Unmodifiable And Immutable Collections Be Retrofitted? Find out now!
#java #jvm #jdk #architecture #middle
https://blog.codefx.org/java/immutable-collections-in-java/
nipafx // You. Me. Java.
Immutable Collections In Java - Not Now, Not Ever // nipafx
The JDK contains immutable collections, but no type ImmutableCollection. Here's why that's so and why it won't change.
Nice overview of modern GCs
https://blogs.oracle.com/javamagazine/understanding-the-jdks-new-superfast-garbage-collectors
#java #gc #performance #middle #senior
https://blogs.oracle.com/javamagazine/understanding-the-jdks-new-superfast-garbage-collectors
#java #gc #performance #middle #senior
Oracle
Understanding the JDK’s New Superfast Garbage Collectors
ZGC, Shenandoah, and improvements to G1 get developers closer than ever to pauseless Java.