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Catalog Preface: Text: What is BeanFactory? What is FactoryBean? Use of FactoryBean Underlying Source Code Interpretation of FactoryBean The difference between with and without an identifier Summary: Preface: Now it's also a good time for Gold, Silver and Silver to jump around. When asked about the Spring Framework during an intervie ...

preface Recently, when learning AOP of Spring framework, I want to know about dynamic proxy first. Other blogs say that the idea of dynamic proxy is related to Java reflection mechanism. Based on the principle of finding other blogs to save time, I am more and more confused, because Java reflection mechanism is very important and urgent ...

1. Java development process Load driver (only need to load once)Establish a database Connection (database Connection pool plays a role in this step)Execute sql StatementResultSet receive result set (query)Disconnect and free up resources Question: The database connection object is obtained through DriverManager. Every time you obtain it, ...

Map interface description (double column set) JavaApi gives a partial overview of the Map interface An object that maps keys to values. A mapping cannot contain duplicate keys; Each key can be mapped to at most one value. The Map interface provides three collection views that allow you to view the contents of a Map in the form of key ...

catalogue I Overview of generics II Define and use classes with generics III Define and use methods with generics IV Define and use interfaces with generics V Generic wildcard I Overview of generics When we learned about the collection, we all know that any Object can be stored in the collection. As long as the objects are stored in t ...

The implementation of Lifecycle is similar to ViewModel, which uses fragment to realize its functions. By adding a fragment to the activity, the fragment can receive various life cycle callbacks. The following source code uses version 2.2.0 Introduction to using method I'm not going to talk too much about the usage of lifecycle here. Un ...

1. Demand Recent development reaction: Monkey / Auto traverses the FC, ANR and other problems during the test. It is impossible to accurately locate the cause and recurrence path of the problem through the log. It is hoped that the recording screen can be added during the test to facilitate the location of the path and cause of the problem rec ...

Connect video MySQL installation configuration Installation and configuration of MySQL database mysql5.5 mysql5.6 mysql5.7(stable) mysql8 Later version Software download Mysql5.7 address: https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.19-winx64.zip Special note If installed Mysql Think again, or in the process of making a ...

1, Environmental description CentOS7；RocketMQ4.5.2；The firewall is closed; Virtual machine address:192.168.0.40，192.168.0.41，192.168.0.42，192.168.0.75； Because other things have been built on the virtual machine before, the alias will be specified this time, which can be accessed directly through ip and port; 2, Software descripti ...

1. Introduction to micrometer Micrometer provides a general API for performance data collection on the Java platform. Applications only need to use the general API of micrometer to collect performance indicators. Micrometer will be responsible for completing the adaptation with different monitoring systems. This makes it easy to switch the mon ...