Classes related to input and output are present in the JavaTM language package java.io . Java technology uses "streams" as a general mechanism of handling data. Input streams act as a source of data.

In addition, the Write Once Run Anywhere feature of Java that was of benefit in so many cases was a disadvantage when it came to platform-specific functionality, including file input/output and ...

Java 16 introduced basic pattern matching with the finalized instanceof method. For more advanced features, like pattern matching in switch, record patterns, and guarded cases, you need Java 21+.