Chinese boat letter side summary (2020 move -Java spring back-end development)

  1. CLASSIFICATION?
  2. Which collection is thread safe? How to achieve?
  3. HashMap and CurrentHashMap what improvements in JDK1.8 there?
  4. Synchronized and volatile principle and the principle difference?
  5. Thread-safe singleton pattern implementation?
  6. https encryption algorithm?
  7. Fast sorting time complexity?
  8. How to determine the list have ring and the ring point?
  9. Notes automatically submit the transaction in Spring?
  10. @Tractional source read it? How to achieve?
  11. Spring transaction propagation mechanism, the isolation level?
  12. Mysql create index statement?
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Origin blog.csdn.net/qq_44837912/article/details/104695540