How to learn java at an advanced level?

Question

Java

Things are like this: I was given the task of studying the topics as best as possible, with as many subtleties of java as possible, according to the content of the book. I read, I try to learn and memorize. But how do I know what they want me to know? For example, take the head of the Line. What can be an in-depth level in them?

Answer 1

1. Read the primer and practice with its examples;
   In paragraphs 1 and 2, the examples should not just be reprinted from the book, you should try to change them, experiment until you fully understand how it works.
   Of course, you can proceed to point 5 only when points 3 and 4 are successful and you have 2-5 softins that bring at least some benefit.

Answer 2

Once we touched on strings:
- how they are stored in jvm
- where they are stored in jvm
- why they did it
- what is the difference between creating a string through String str = "stroka" from String str= new String("stroka")
- many many of the same features about which you need to know.
Regarding strings in general, it is very strictly necessary to understand how they work. you will often have to work with them, in addition, ignorance of how they work extremely affects the performance of the program.

Answer 3

Recommend Book for Exam Level 1 Java
Oracle Certified Associate Java SE 8 Programmer
Authors: Jeanne Boyarsky & Scott Selikoff
There are also books for the next levels of the exam.
These books show the nuances of Java in a very accessible language.