Judging from the current environment, the difficulty of successful job-hopping is much higher than in previous years. An obvious feeling: This year's interview, both on one side and on the other, tested the technical skills of Java programmers.

Recently I have compiled a review of interview questions and high-frequency interview questions and technical points into a "Java Engineer High-frequency Interview System.pdf" and a "Java Core Knowledge System Document.pdf" collected online ( In fact, it took a lot more energy than expected), including collections, JVM, concurrent programming, Spring, MyBatis, microservices, Redis, Dubbo, design patterns, data structures, distributed, etc.! Due to the limited space, for the convenience of everyone watching , Here is a picture of each part of the catalog and answer screenshots!

This Java interview system document is very suitable for:

Java programmers who want to change jobs in the near future and need to be interviewed should check for omissions and make up for shortcomings as soon as possible;
Want to understand the latest technical requirements of "first-tier Internet companies", compare and find out their strengths and weaknesses, and evaluate their competitiveness in the existing market;
I have been doing Java development for several years, but have not yet formed a systematic Java knowledge system, and lack a clear improvement direction and learning path programmers.

I believe it will bring you a lot of gains.

Java engineer high-frequency interview system

Java collection