Programmer Think

problem You have a piece of code that accesses elements in lists or tuples through subscripts, but this sometimes makes your code difficult to read, so you want to access elements by name. Solution ​ collection. The namedtuple () function helps you solve this problem by using an ordinary tuple object. This function is actually a factory meth ...

Three features of Java (encapsulation / Inheritance / polymorphism) 1. Encapsulation Benefits of encapsulation: Hide information (permissions) and provide specific method accessEasy to add control statementsConvenient modification and Implementation Specific performance of packaging: Attributes are decorated with private The method is mo ...

follow [front end Xiaoao] , read more original technical articles create object Create a single Object: Object constructor and Object literalDisadvantages: using one interface to create many objects produces a lot of duplicate code Relevant code → Factory mode Create a specific interface according to a specific object creation proce ...

Then declare that in the following packaging process, the scope always uses the default scope <!-- Used to compile JSP -- > <dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-jasper</artifactId> <!--<scope>runtime</scope& ...

problem Let's talk about three questions first and look at the source code with questions: How does the thread pool keep the core thread from dying?If the number of core threads is 0, will new tasks be queued first or run directly? Will the process pool eventually die out?Allow the core thread to timeout. Where is the impact point Examples ...

1.this is flag Idea: the title description is flag 2.pdf Attachment: link: https://pan.baidu.com/s/1nyajq1Bjql-scT2FxicOGg Extraction code: 5zzi Idea: open the attachment and find a pdf file with a picture In the title description, "there is nothing below the picture", it is speculated that it is multi-layer or picture occ ...

1, JSON development ideas Recently, there is a project that uses JSON data to communicate with the host computer. I will share the development process with you. At first, I wanted to use the JSON library provided by MDK, and there was no problem in compiling, but finally I found that the library had requirements for the compiler, which was not ...

consumer.registerMessageListener(new MessageListenerOrderly() { @Override public ConsumeOrderlyStatus consumeMessage(List<MessageExt> msgs, ConsumeOrderlyContext context) { for (MessageExt msg : msgs) { System.out.println(new String(msg.getBody())+" Thread:"+Thread.currentThread( ...

For image download, domain name resolution and time synchronization, please click Alibaba open source mirror station 1, maven uninstall maven only configures the environment variable and local warehouse when it is used. We only need to delete the local warehouse and remove maven's environment variable from the environment variable. 1. Delete ...

This blog is designed for self-learning. If you have any questions, please contact the blogger in time1.WHY?#When you use git add Have you ever added files you don't want to submit to the cache? For example, if you upload the local configuration information of the project to git, it will conflict with the local configuration when others pull it ...