String Concatenation - JEP Café #7

This #JEPCafe discusses JEP 280: Indify String Concatenation, released with JDK 9. We talk about string concatenation and formatting, both from the pattern and the performance point of view, and the performance gains you may expect. In a nutshell: this JEP gives you performance benefits by just moving from JDK 8 to JDK 17, without modifying your code!

⎯⎯⎯⎯⎯⎯ Chapters ⎯⎯⎯⎯⎯⎯
0:00 Intro
0:50 What does Indify mean?
1:42 Optimizing String Concatenation with Invokedynamic
2:44 Using a StringBuilder for concatenation
4:55 Delegating concatenation to some other code
6:09 Measuring performances with JMH
7:46 Analyzing the results given by JMH
10:08 When to use a StringBuilder
11:35 Converting numbers to strings
15:30 String formatting
17:00 Outro

⎯⎯⎯⎯⎯⎯ Resources ⎯⎯⎯⎯⎯⎯

Categories: #Java #OpenJDK #JDK #JDK17

[dreamerLevel]

Not only JDK is move fast. But you guys are spreading the knowledge and explaining the use of the new features and its performance benefits. That's really great !!
I am a beginner and I am getting ton of high quality knowledge from these videos and the articles which u write. Thanks for all this . ❤️

[joshaustintech]

I didn't realize how naïvely the StringBuilder is handled in certain scenarios. 🤯 Very useful information here!

[PabloSagoz]

Perfect content for coffee mornings, thanks a bunch!

[MakeItStik]

Very nice video. Its sad that we will have to wait for next month. Please also include concurrency topics in these JEP videos.

[gabosol]

Great stuff covering fundamental concepts about daily work as it is string concatenation!

[kookoon]

Awesome stuff, love to "unlearn" things like always favoring string concatenation with StringBuilder over plain strings

[lukmanmudi]

In-depth explanation as always. In case anyone is interested in going further with JMH; here are two courses on Pluralsight I would recommend. 1. "Micro-experimentation Tools in Java 9" and 2. "What's new in Java 12". Thanks once again José.

[Hakky]

Amazed to see that the coffee is still warm after 17 minutes, must be a good glass! Where can we get these? :D Well explained video by the way regarding the jdk improvements

within 1 standard deviation is 68%
within 2 standard deviations is 95 %
within 3 standard deviations is 99.7%

[askarkalykov]

Can you please crank up the volume in jep cafe videos? Find myself not being able to hear anything while in transport - happens always only with these videos.

[james]

I'm pretty sure that at least the JDK 8 compiler could optimize simple loops and replace the string concatenations inside with one StringBuilder instance and an append call inside the loop. 🤔

[boegi]

Great video! You mention JMH as the one and only framework for Performance measurements. I'am curious how would you test the performance of a Controller. Startup a for instance a Spring test context, autowire a controller instance?

[DavidDLee]

What's with the low volume? Can you make it louder?

[jeancarloabreu]

more volume to the voice, less to the music please ...not easy with accent

[navyasm]

That’s how a Java programmer looks like

[raulbache]

The fake drinking at each cut must stop. Cringetopia