I interviewed a 985 graduate, and I will never forget the expression when answering the "performance tuning" question

Yesterday morning, a 33-year-old 985-year-old big brother came to apply for the job. When I just got my resume, I thought about going through the motions and finally throwing it to the director for decision-making (education and work experience are OK)

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Originally, everything was as I guessed, and everything was good. I asked what I asked, and the answer was very good. However, when I asked about the project, there was a problem. The general introduction can be answered. When asked about performance tuningThe question of the aspect is directly overwhelmed... I can't answer it, alas!

These questions are very simple, and they are not fresh graduates, coming out for interviews and looking for jobs. How can they not be?

Java performance tuning For every technical person who is fighting on the front line of development, with the increase of system access and bloated code, various performance problems will emerge one after another.The increasingly complex systems and intricate performance tuning have put forward higher requirements for the technical breadth and technical depth of Java engineers.Performance tuning is essential

if it is not a fresh graduate who wants to get a high salary

Today, I will share with fans a working note of "Alibaba Java Performance Tuning" on this issue. This note starts from actual combat, selects high-frequency performance problems, and extracts optimization ideas and methods through the underlying Java source code.The implementation principle behind it finally forms a set of "tuning methodology that can be used after learning".

Due to the length of the article, I will show you the core summary in the form of screenshots

With interview mindMap (for reference only)

List of Contents

How can I do performance tuning?

Overview

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Java programming performance tuning

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Multi-threaded performance tuning

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JVM performance monitoring and tuning

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Design Pattern Tuning

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Database performance tuning

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Practical training ground

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The above is all the content shared today, I wish you all to receive your favorite Offer as soon as possible~