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Re:Java Turns 25 – Whats Next? [pdf] by ptx on Sunday September 20, 2020 @01:26PM (#24535477)
At least two significant things happened:

1) It finally got anonymous functions in Java 8, so you no longer have to use anonymous classes and complicated design patterns as substitutes.

2) The distribution model changed from targeting a preinstalled JRE to bundling your own runtime with jlink and jpackage (i.e. the same as native applications and .NET Core).

Re:Java Turns 25 – Whats Next? [pdf] by chrisseaton on Sunday September 20, 2020 @01:33PM (#24535562)
Right, these are both one-day study exercises I think to come up to speed. Java's designed like this - almost everything is additive and builds on the same principles.
Re:Java Turns 25 – Whats Next? [pdf] by saagarjha on Sunday September 20, 2020 @08:16PM (#24538549)
I think it might take a little more than one day to fully understand Java 8's new features around lambdas and streams.