Programmer Think

1, Built in data type Four valued logic typeBinary logic typelogic integer reg net-typebyte int longint shortint bit Signed typeUnsigned typebyte integer int longint shortintlogic bit reg net-type Tips: (1) The default value returned by four value status is x, and the default value returned by two value status is 0. (2) logic type can onl ...

Iterator Pattern It's Java and Net programming environment. This pattern is used to access the elements of the collection object sequentially without knowing the underlying representation of the collection object. Iterator patterns are behavioral patterns. If our collection elements are implemented in different ways, including arrays, java ...

Express - based on node JS platform web application development framework - Express Chinese document | express Chinese networkhttps://www.expressjs.com.cn/ Express is based on Node The web development framework developed by JS is a Node JS module; Since it is based on Node JS, the premise of using express is that the computer must have installe ...

Share: In python, there are two types of data. Built in and custom. Built in data types include numbers, strings, Booleans, lists, tuples, dictionaries, Bytes, collections, and some less commonly used data types. Customized data types are generally in the form of classes, and the above built-in types are combined as required to become unique ...

When a List deletes an element, the first reaction is often a for loop, which calls List based on the if condition Remove (I) or List Remove (object) to remove the elements on the collection. public static void main(String[] args) { List<String> list = new ArrayList(2) { { add("a"); add("b"); } ...

The previous article explained the use and source code of zookeeper, so this time we continue to understand the relevant contents of dubbo, the golden partner of zookeeper. Of course, dubbo is also a typical rpc framework, so we analyze it one by one from the client and server, and there are a series of subsequent articles. Take your time. SP ...

prefaceThrough the previous study, we have a certain understanding of the relevant concepts and knowledge points of custom components. Today, let's learn several methods to set styles for custom elements and their sub elements.Add styles directly to custom labelsindex.html: <style> my-card{ display: block; margin: 20px ...

Pre knowledge: the concept of tree and vector In order to ensure the learning effect, please ensure that you have mastered the pre knowledge before learning this chapter! Learning objectives Understand the idea, implementation, advantages and disadvantages of several storage methods of treeMaster the code implementation of the storage met ...

Violence laws are often inefficient and waste time on many unnecessary calculations. Pruning is a metaphor: to "cut off" branches that will not produce an answer or are unnecessary. The key to pruning lies in the judgment of pruning: what to cut and where to cut. Pruning is a common optimization method in search, which can often op ...

catalogue preface 1, Pure annotation development 2, Operation steps 1. Import dependency 2. Create the target interface, define the abstract method, implement the implementation class of the target interface, and rewrite the method (target method) 3. Create a notification class and define notification methods 4. Create Spring core config ...