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Rafael del Nero
12.8K posts
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Rafael del Nero
@RafaDelNero
๐Ÿš€ Mentoring #Java developers to work with cutting-edge technologies, earning top salaries ๐Ÿ… @Java_Champions | Speaker | Book Author ๐ŸŽฏ ยฎ@JavaChallengers
Dublin City, Ireland
javachallengers.com
Joined January 2010
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  • Pinned
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    Rafael del Nero
    @RafaDelNero
    Aug 6, 2025
    ๐Ÿš€ Fantastic news! I've published a FREE book with 50+ real-world #Java interview questions for mid/senior developers aiming for international jobs & top salaries. ๐ŸŒ๐Ÿ’ผ ๐Ÿ’ป Download now & start growing your career: #JavaChallengers #JavaCareer
    Real World Java Interview Questions Book | Java Challengers
    From javachallengers.com
    3.9K
  • user avatar
    Rafael del Nero
    @RafaDelNero
    Aug 28, 2023
    To be an incredible #Java developer, we must go beyond #Java. We need to know how to build scalable systems. In this New Article, learn the fundamentals of #cache! Also, we need to pass the #SystemsDesignInterview. ๐Ÿคฃ Learn more about #cache here: bit.ly/45tfqCm
    37K
  • user avatar
    Rafael del Nero
    @RafaDelNero
    Aug 29, 2022
    A must-follow list for @Java developers: @errcraft @GeertjanW @BrianGoetz @venkat_s @brjavaman @adambien @javinpaul @baeldung @arungupta @brunoborges @myfear @joshbloch @starbuxman @jessitron @mariofusco @mreinhold @unclebobmartin @KentBeck @javarevisited
  • user avatar
    Rafael del Nero
    @RafaDelNero
    Dec 14, 2019
    What are the 11 Mistakes @Java Developers make when Using Exceptions? #JavaChallengers Avoid them by reading this article: bit.ly/2qyXAQn
  • user avatar
    Rafael del Nero
    @RafaDelNero
    Apr 29, 2021
    I am very excited to announce that the first #JavaChallengers book version is released! There are more than 70 Java Code Challenges to help improve your #Java skills! #JavaChallengers You can get the book right away: leanpub.com/javachallengers
    Java Challengers
    From leanpub.com
  • user avatar
    Rafael del Nero
    @RafaDelNero
    Apr 26, 2019
    Improve your @Java skills by watching the new #JavaChallenge of this week about #Streams! #JavaChallengesVideos Do you know the output from this challenge? youtube.com/watch?v=UhuwlEโ€ฆ
  • user avatar
    Rafael del Nero
    @RafaDelNero
    Oct 6, 2023
    Quick #Java tip: Mocking several chained objects on #Junit is a pain. We can mock everything at once as the following: Service service = Mockito.mock(Service.class, Mockito.RETURNS_DEEP_STUBS); when(service.getSomething().getSomethingElse()).thenReturn(mock(AnyClass.class));
    30K
  • user avatar
    Rafael del Nero
    @RafaDelNero
    Oct 24, 2023
    For Java developers, mastering streams is essential. Don't miss out on the importance of functions like max and min! Explore the depths of this Java code challenge and level up your skills. bitly.ws/PzNH #Java #JavaProgramming #CodeChallenge #Streams #TechInsights
    16K
  • user avatar
    Rafael del Nero
    @RafaDelNero
    Aug 14, 2023
    To become a fantastic #Java developer, we must go beyond Java. We need to master what makes a great software design. Also, we need to pass on Systems Design interviews ๐Ÿ˜‚ . Therefore, master what is Latency and Throughput: javachallengers.com/latency-and-thโ€ฆ
    Latency and Throughput for Systems Design Interview
    From javachallengers.com
    24K
  • user avatar
    Rafael del Nero
    @RafaDelNero
    Nov 8, 2023
    Whenever I see a #Java developer working very hard and earning too little, I realize they don't know how to be visible in the market and grow their careers strategically. Become a high-paid #Java developer and take your career to the next level! #java #javacareer #coding
    00:00
    21K
  • user avatar
    Rafael del Nero
    @RafaDelNero
    May 7, 2019
    The only way to be really good in any skill is by practicing it and understanding deep concepts! #JavaChallengesVideos Watch the new @Java challenge video: youtube.com/watch?v=zX7Mduโ€ฆ
  • user avatar
    Rafael del Nero
    @RafaDelNero
    Jun 3, 2019
    Hello @java developers! Improve your @java skills and get prepared for @java certifications! #JavaChallengesVideos Watch the video and improve your @java skills: youtu.be/0aDjhPatzk4
  • user avatar
    Rafael del Nero
    @RafaDelNero
    Feb 18, 2022
    Hey #Java developers! What concurrent class do you use the most in your day-to-day work project? Have you ever used Thread, ForkJoinPool, CyclicBarrier, locks, volatile or CompletableFuture? What is the concurrent class you use the most in your day-to-day work?
  • user avatar
    Rafael del Nero
    @RafaDelNero
    Jan 22, 2020
    What are the 11 Mistakes Java Developers make when Using Exceptions? #JavaChallengers Check out this article and find out if you making one of those mistakes: javachallengers.com/11-mistakes-jaโ€ฆ