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Has somebody a tip how to get an better overview of chapter 3/4 OCP Java SE 8 Programmer II?

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Maybe stupid question and I'm not certain if may ask this question but:
- In 2019 I have done the OCA certification for JAVA 8.
- I'm now "In Between Jobs" , and I thought to finish my OCP in... two/three months.
- I have read the book "OCP Oracle Certified Professional Java SE 8 Programmer II" (Jeanne Boyarsky/Scott Selikoff), one time in the past weeks.
- I have made for every chapter the examples, change the examples by myself, in Eclipse. And so far I can follow this, what it is doing.
- I'm now reading the book for the second time and I'm at chapter 5 again.
- BUT chapter 3 (Generics and Collections) and 4 (Functional Programming) are for me very hard. When I made the questions, it's a mess. I can follow the explanation but to reproduce it, it is hard!

For example I do understand what a Functional Interfaces are and what you can do with it, I can follow it. But to apply it  or to reproduce it, certainly when it is mixed up with lambda's, streams, Generics, Lists, method references etc, than I'm getting completey lost! (I'm reading more than once "Ok what was before a function of 4 lines is now achieved the same in one line (lambda)".)

My question is, does someone have an advise or tip, how to get this easier to understand in steadof that just learning a lot of tables from the the top of head and hoping that I remember the righ table(s) from the book? (There are a lot of tables in the book they say mostly "you have to memorize it...",)

Again, maybe stupid question, but maybe is someone saying you are not the first one there is a site... otherwise I have to find out by myself...

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