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Why use log4j instead of system out. println?
This is the back-end small class of the monastery. Each article is shared from [background introduction] [knowledge an…… -
Why is the capacity of HashMap power of 2 and what is the load factor
Transferred from: When I was preparing for a job interview, I often had such an interview question in my face: "why i…… -
How to view the version information of a development project framework
1. To view the spring version in a project: First, find the import location of the jar package in the project, and put…… -
What are filters and interceptors, what are their differences, and what is the relationship with AOP?
This is the back-end small class of the monastery. Each article is shared from [background introduction] [knowledge an…… -
Exception: Android os. NetworkOnMainThreadException
Scenario: During Android development, the main thread accesses the network to solve the following problems: The code t…… -
Whether to log the results returned by the service, what kind of log should be logged, and why?
This is the back-end small class of the monastery. Each article is shared from [background introduction] [knowledge an…… -
Interface and entity class
This is the back-end small class of the monastery. Each article is shared from [background introduction] [knowledge an…… -
Listiterator interface source code analysis – java8
1. ListIterator VS Iterator: package sourcecode. analysis; -
Java standard I / O stream programming record (Part 2)
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How to make a monthly salary of 20000 for java development in Beijing, and what level of technology is required?
Java programmers with a monthly salary of 20000 are intermediate programmers. The technology is a little better, but i…… -
Integer. Decode() and intger valueof()
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Comparison between Java local inner class and anonymous inner class
< span style="color:#808080;"> Local inner class and anonymous inner class have the same capabilities and functi…… -
How to generate code using mybatis generator?
This is the back-end small class of the monastery. Each article is shared from [background introduction] [knowledge an…… -
Summary of important concepts of common Java classes
Is to automatically convert the basic data type to the wrapper type; (1)Integer it = 200; Actually: integer it3…… -
ArrayList source code analysis – java8
< H4 id = "1 Summary of features" > 1 Summary of features: < H4 id = "3 source code analysis" > 3 Source c…… -
Function interface biconsumer
package sourcecode.analysis; /** @Author: cxh @CreateTime: 18/3/8 15:54 …… -
Summary of design patterns involved in JDK
All design patterns have found an implementation in JDK (not all are listed, because there are too many reasons, and t…… -
What is restful? What are the rest methods? What’s the difference?
This is the back-end small class of the monastery. Each article is shared from [background introduction] [knowledge an…… -
Introduction to Shiro framework
This is the back-end small class of the monastery. Each article is shared from [background introduction] [knowledge an…… -
Brief introduction to RMI
This is the back-end small class of the monastery. Each article is shared from [background introduction] [knowledge an…… -
What is dirty data? Is it possible to generate dirty data in the cache? What should I do if dirty data occurs?
This is the back-end small class of the monastery. Each article is shared from [background introduction] [knowledge an…… -
Treemap source code analysis – java8
< H4 id = "1" feature analysis "> 1 feature analysis Briefly introduce package sourcecode analysis; -
Java controls the reference type of classes and makes rational use of memory
Java provides Java Lang.ref package. The classes under this package are related to the garbage collection mechanism Fi…… -
Variables that final can modify in Java
Here we only discuss the variables that final can modify, not methods and classes. 1. Final can modify variables: clas…… -
How to randomly access any service in the web when two services are deployed
This is the back-end small class of the monastery. Each article is shared from [background introduction] [knowledge an…… -
Java download EXECL table
Java uses POI to write data to the EXECL table and download it in two ways 1. Use the API of pool to create a table, d…… -
Simple use of RMI?
This is the back-end small class of the monastery. Each article is shared from [background introduction] [knowledge an…… -
Brief introduction to RMI
This is the back-end small class of the monastery. Each article is shared from [background introduction] [knowledge an…… -
Validation parameter verification
This is the back-end small class of the monastery. Each article is shared from [background introduction] [knowledge an…… -
Java interface
The concept of interface in Java, an interface is a collection of all abstract methods. An interface needs to be defin……