(mis)using modern Java
Modern Java is really awesome when it comes to “Hello, World!” demos. It’s also cool for a sophisticated systems and algorithms, provided their authors write code which obeys a few fairly simple contracts and avoids obvious traps.
There are a few mantras regarding recent features of modern Java, such as:
records can replace JavaBeans everywhere you never need to write hashCode() for records pattern matching with instanceof is the best tool for equals() just ignore --illegal-access and set it to permit synchronize (new Long(42)) is the best for monitoring and so on.