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Stream overview What is flow Stream is not a collection element. It is not a data structure and does not save data. It is about algorithms and calculations. It is more like an advanced version of Iterator. In the original version of Iterator, users can only explicitly traverse elements one by one and perform some operations on them; In th ...

summary The previous article explained the knowledge points related to window and decorview. Interested readers can see the following: Android Window series (I) - window and decorview This article will continue to explore the relationship between window and view, mainly focusing on "how to add view to window". How to add View in w ...

preface In the first section, we mentioned that on the kafka server side, we can create producers and send messages through commands. However, in the actual development, we all create producers and send messages in the project in the form of java. In this section, we will explain kafka producer based on JAVA API. 1, Introduction to JAVA API c ...

🧭 Implementation class of Map interface HashMap 🚀HashMap HashMap is an implementation class of Map interface, which is displayed in blog Java Map interface We have used HashMap to summarize the commonly used methods. HashMap is the most frequently used implementation class of Map interface.HashMap stores data in the form of key value ...

1, Function description When using the mobile music player, you will see the buttons of "previous", "pause / play", "restart" and "next". It can be seen that the song name and singer name are displayed at the top of the screen, and four buttons are placed at the bottom to operate "previous&quot ...

Feign introduction A central concept supported by feign of pring Cloud is named client Feign client uses @ feign client to register and assemble components and call remote server on demand Spring Cloud uses FeignClientsConfiguration to create a new collection as the ApplicationContext (application context) of each named client, including feign ...

1. Install Docker Official Web https://docs.docker.com/engine/install/centos/ # 1. Uninstall the old version yum remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-engine # 2. Installation packages required yum install ...

JavaScript this keyword In object-oriented languages, this represents a reference to the current object. But in JavaScript, this is not fixed. It will change with the change of execution environment. In a method, this represents the object to which the method belongs.If used alone, this represents a global object.In the function, this repres ...

Lambda expressions, also known as closures, are the most important new feature that drives the release of Java 8. Lambda allows functions to be used as parameters of a method (functions are passed into the method as parameters). Using Lambda expressions can make the code more concise and compact. grammar The syntax format of lambda expressi ...

File summary: If you want to realize IO stream operation, you must know the representation of files on the hard disk Java provides a class that allows us to manipulate files on the hard disk: file. File is the representation of a file File: abstract representation of file and directory (folder) pathnames. Construction method of File class ...