Converting java.util.UUID values into byte [] Sometimes you may want to convert from java.util.UUID into external serialization: for example, as String s or byte arrays (byte []). Conversion to String ...

I have a project (in develop), and there are a couple of entities with java.util.Map field, that should be mapped to PostgreSQL jsonb column, so we have a pair of custom converters applied to JDBC ...

If you have a Java application and are wondering how you can run it, here's how to compile and run Java from the command prompt in Windows.

Early access builds of JDK 25 can be downloaded from jdk.java.net. The features slated for JDK 25 include an enhancement to the JDK Flight Recorder (JFR) to capture CPU-time profiling information ...

Spring Security太重而且配置繁琐。自己实现所有的点必须又要顾及到，更是麻烦。最近看到一个权限认证框架，真是够简单高效。这里分享一个使用Sa-Token的gateway鉴权demo。

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面试官：说说读写 锁实现 原理？ ReentrantReadWriteLock（读写锁）是Java并发包（java.util.concurrent.locks）中的一个类，它实现了一个可重入的读写锁。 读写锁允许多个线程同时读取共享资源，但在写入共享资源时只允许一个线程进行。

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