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Java object oriented inheritance Inheritance describes the ability to use all the functions of an existing class and extend the functions without rewriting the original class. To use inheritance, the is-a principle (code reuse) must be met. The defined syntax is: subclass extends parent class. Subclass: also known as a derived c ...

catalogue Basic idea: 5.1 break up video into pictures 5.2 comparing image similarity 5.2.1 compare image similarity based on equality 5.2.2 calculate whether the pictures are equal based on numpy 5.2.3 hash based (taking mean hash algorithm as an example) 5.3 video capture: ffmpeg 5.4 comprehensive application Basic idea: 1. Break ...

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1. Deadlock Scenario: when thread a owns the lock of object a, it wants to obtain the lock of object B; Thread B owns the lock of object B and wants to own the lock of object A. when two threads acquire the lock, they will not release the lock already held. Therefore, deadlock is caused. Example code: @Slf4j public class ThreadTest { pri ...

Common operations of all files in PHP File operation Write string to file $str = "abed, I see a silver light, It's suspected to be frost on the ground. look at the bright moon, Bow your head and think of your hometown."; # It must be enclosed in double quotation marks. Only in this way \ r\n can it be parsed file_put_contents('./test. ...

Routine: realize slow character output public class ThreadDemo1 { public static void main(String[] args) throws InterruptedException { String content = "Others say you can't because he can't do it himself. You should try your best to protect your dreams. Those who laugh at you will fail," + "They want to make you li ...

Before, many friends asked me what my open source project documentation website was built with. In fact, it is built with Docsify. For details, please refer to How to write elegant open source project documents . Docsify is basically enough to build a systematic document website, but sometimes we have both systematic and fragmented articles. I ...

Let's first look at the main categories of IO streams     Very many (numb. jpg) catalogue A node flow and a processing flow 1.1 concept 1.2 character stream 1.2.1   BufferedReader 1.2.2 BufferedWriter 1.2.3 Buffered copy 1.3 byte stream 1.3.1BufferedInputStream  1.3.2 BufferedOutputStream  1.3.3   Byte stream copy ...

preface In learning data structures, we often come into contact with the term sorting, but when we learn, we may be at a loss when facing the code directly. Why do the interface use these parameters and why do we exchange them back and forth... We don't know what the authors think when implementing these interfaces, In this blog, I wil ...

CentOS 7 RPM installs Elasticsearch 7.14.1 and common plug-ins Installing JDK 1.8 Install jdk: Open the official website to download: https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.htmlDownload the Linux x64 RPM Package: jdk-8u301-linux-x64.rpmInput password, 2696671285@qq.com /Oracle123 (if it fails, you can search th ...