October 2018
Intermediate to advanced
982 pages
23h 29m
English
book
Developing Java Applications with Spring and Spring Boot
by Claudio Eduardo de Oliveira, Greg L. Turnquist, Alex Antonov
Content preview from Developing Java Applications with Spring and Spring Boot
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Safe calls
The safe call can be written using the .?. It can be called when the reference holds a non-null value when the value holds a null reference then the null value will be returned:
val hash:TrackedHashTag? = TrackedHashTag(hashTag="java",queue="java")val queueString = hash?.queue
When the hash? holds null, the null value will be assigned to a queueString attribute. If the hash? has a valid reference, the queue attribute will be assigned to a queueString attribute.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.