Programmer Group

IDO-EVB6Y09 is a multi interface internet of things gateway device equipped with NXP imx6uliec processor, with a maximum dominant frequency of 800MHz. It has three functions: 4G industrial router, 4GDTU and industrial HMI. It supports the wireless communication mode of WIFI Bluetooth module and 4G all Netcom module, and provides multiple functi ...

BeanDefinition Definition of Bean. In Spring, how can we define a Bean? @Bean@Component(@Service,@Controller) Also, you can use BeanDefinition For example, we can define a Bean by defining a BeanDefinition object: // A BeanDefinition is defined AbstractBeanDefinition beanDefinition = BeanDefinitionBuilder.genericBeanDefinition().getBeanDe ...

Complete leetcode's intensive lecture on algorithm interview in Dachang 24. Other types of questionsVideo Explanation (efficient learning): Click to learncatalog:1. Introduction2. Time and space complexity3. Dynamic planning4. Greed5. Binary search6. Depth first & breadth first7. Double pointer8. Sliding window9. Bit operation10. Recursion ...

JDBCTemplate JDBC template (concept and preparation) What is a JdbcTemplate The Spring framework encapsulates JDBC and uses JdbcTemplate to facilitate database operation preparation Introduce related jar packages [the external chain image transfer fails. The source station may have an anti-theft chain mechanism. It is recommended to ...

Spring transaction management 1. Business What is a transaction A set of operations either succeeded or failed Characteristics of transactions ACID Atomicity, a group of operations is a whole, either all successful or all failed, and cannot be separatedConsistency: the data is consistent before and after the transactionIsolation: multipl ...

reference resources: https://tech.meituan.com/2018/11/15/java-lock.html https://www.cnblogs.com/jyroy/p/11365935.html Exclusive lock and shared lock are the same concept. Let's first introduce the specific concepts, and then introduce the exclusive lock and shared lock through the source code of ReentrantLock and ReentrantReadWriteLock. Exclu ...

Why do I need a bloom filter Imagine how you would handle the following scenario: Whether the mobile phone number is registered repeatedly Has the user participated in a second kill activity Forge requests for a large number of id query records that do not exist. At this time, the cache misses. How to avoid cache penetration To solv ...

Convolutional neural networkGrasp its core idea, that is, reduce the content of the image through convolution operation, and focus the model's attention on the specific and obvious features of the image.max pooling - enhance features and reduce datarealizationIn the following code, the accuracy of the model on the training data may rise to abou ...

Before going into Dubbo, you must understand the SPI mechanism in Dubbo. 1, Background 1. Source Dubbo's extension point loading is enhanced from the SPI (Service Provider Interface) extension point discovery mechanism of JDK standard. However, it is different. It improves the following problems of SPI of JDK standard: The SPI of the JDK stan ...

The so-called digital thousandth form, that is, from the single digit, add a comma between every three digits. For example, "10000". To meet this requirement, I initially wrote such a function: Method 1 The code is as follows: // Method 1 function toThousands(num) { var result = [ ], counter = 0; num = (num || 0).toString() ...