A .JDK
(1) read the JAVA source code it
(2) Map and delete elements List what will happen
II. Database
(1) Limit When the paging data level reaches 500w
(2) the underlying data structure of the database
III. Framework
Advantages and disadvantages of (1) SpringBoot of
(2) SpringBoot and Spring Comparison
(3) What are the message queue, kafka know and compare activemq