Christa  Stehr

Christa Stehr

1602320363

How the HotSpot and Graal JVMs execute Java Code

Summary

James Gough explores the subsystems that are involved in interpreting, compiling and executing a Hello World Application. He dives into JIT compilation and the arrival of the JVM Compiler Interface to explore how optimizations are applied to boost the performance. He discusses HotSpot, explores Graal and the JVM ecosystem to discover performance benefits of a platform 25 years in the making.

Bio

James Gough is an executive director and developer at Morgan Stanley, where he’s focused on building customer-facing technology. A Java developer and author, he first became interested in Java during his degree program; after graduating, he became a member of the London Java Community. He is a regular conference speaker and spent four years teaching Java and C++ around the world.

#qcon london 2020 #compilers #graalvm #java #transcripts #jvm #performance #development #presentation

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How the HotSpot and Graal JVMs execute Java Code
Samanta  Moore

Samanta Moore

1621137960

Guidelines for Java Code Reviews

Get a jump-start on your next code review session with this list.

Having another pair of eyes scan your code is always useful and helps you spot mistakes before you break production. You need not be an expert to review someone’s code. Some experience with the programming language and a review checklist should help you get started. We’ve put together a list of things you should keep in mind when you’re reviewing Java code. Read on!

1. Follow Java Code Conventions

2. Replace Imperative Code With Lambdas and Streams

3. Beware of the NullPointerException

4. Directly Assigning References From Client Code to a Field

5. Handle Exceptions With Care

#java #code quality #java tutorial #code analysis #code reviews #code review tips #code analysis tools #java tutorial for beginners #java code review

Tyrique  Littel

Tyrique Littel

1600135200

How to Install OpenJDK 11 on CentOS 8

What is OpenJDK?

OpenJDk or Open Java Development Kit is a free, open-source framework of the Java Platform, Standard Edition (or Java SE). It contains the virtual machine, the Java Class Library, and the Java compiler. The difference between the Oracle OpenJDK and Oracle JDK is that OpenJDK is a source code reference point for the open-source model. Simultaneously, the Oracle JDK is a continuation or advanced model of the OpenJDK, which is not open source and requires a license to use.

In this article, we will be installing OpenJDK on Centos 8.

#tutorials #alternatives #centos #centos 8 #configuration #dnf #frameworks #java #java development kit #java ee #java environment variables #java framework #java jdk #java jre #java platform #java sdk #java se #jdk #jre #open java development kit #open source #openjdk #openjdk 11 #openjdk 8 #openjdk runtime environment

Samanta  Moore

Samanta Moore

1624955940

12 Common Java Mistakes Made by Newcomers

Everyone makes mistakes, not just beginners, but even professionals. This article goes over a dozen common mistakes that Java newbies and newcomers make and how to avoid them. Have you or your colleagues made any of these common Java mistakes early in your career?

Everyone makes mistakes, not only learners or beginners but professionals. As a programming course, the CodeGym team often collects mistakes of newbies to improve our auto validator. This time we decided to interview experienced programmers about mistakes in Java they made closer to their careers start or noticed them among their young colleagues.

We collected their answers and compiled this list of dozen popular mistakes Java beginners make. The order of errors is random and does not carry any special meaning.

#java #learn-java #java-programming #beginners #beginners-to-coding #learning-to-code #learn-to-code #learn-to-code-java

Samanta  Moore

Samanta Moore

1620458875

Going Beyond Java 8: Local Variable Type Inference (var) - DZone Java

According to some surveys, such as JetBrains’s great survey, Java 8 is currently the most used version of Java, despite being a 2014 release.

What you are reading is one in a series of articles titled ‘Going beyond Java 8,’ inspired by the contents of my book, Java for Aliens. These articles will guide you step-by-step through the most important features introduced to the language, starting from version 9. The aim is to make you aware of how important it is to move forward from Java 8, explaining the enormous advantages that the latest versions of the language offer.

In this article, we will talk about the most important new feature introduced with Java 10. Officially called local variable type inference, this feature is better known as the **introduction of the word **var. Despite the complicated name, it is actually quite a simple feature to use. However, some observations need to be made before we can see the impact that the introduction of the word var has on other pre-existing characteristics.

#java #java 11 #java 10 #java 12 #var #java 14 #java 13 #java 15 #verbosity

Were  Joyce

Were Joyce

1623424560

Measuring Java Code Execution Time with Spring's StopWatch

Introduction

Measuring code execution time is a vital step in trying to write efficient applications. Temporal awareness of your code on a machine that might be serving a great deal of users lets you plan further, accounting for the execution time.

In multi-threaded systems, it’s also useful to measure the execution time of individual Threads or asynchronous tasks.

Since there’s no built-in, convenient way to measure code execution in Java - for Spring-based solutions, we’ve been introduced to the StopWatch tool.

In this tutorial, we’ll take a look at _how to measure code execution time in Java with Spring’s __StopWatch_.

#java #spring boot #spring #measuring java code execution time with spring's stopwatch #measure java code execution time #stopwatch