1-z0816 prep (Java certification)

There are several topics to study:

1. Java fundamentals
2. Modular migration and services
3. Concurrency
4. I/O & NIO
5. JDBC
6. Annotations
7. Generics & collections
8. Functional interfaces/ Lambda/ Stream
9. Secure coding
10. Localization/ Exception/ Assertion/ Optional

General resources covering all the topics:

Book

https://www.amazon.com/Oracle-Certified-Professional-Programmer-Study/dp/1119617626

https://www.amazon.fr/Oracle-Certified-Professional-Developer-Complete/dp/1119619130

Testing

https://www.whizlabs.com/ocpjd-java-se-11-programmer-ii/ (5 tests)

https://enthuware.com/java-certification-mock-exams/oracle-certified-professional/ocp-java-11-exam-ii-1z0-816 (5 tests)

Other programmers feedbacks

Javin Paul article: 

https://javarevisited.blogspot.com/2019/12/how-to-crack-java-se-11-certification.html 

Karsten Thoms article: 

https://dev.karakun.com/2021/04/29/ocp-java11.html

Here the details of some resources I used for different each topics:

1. Java fundamentals

https://www.w3schools.com/java/

2. Modular migration and services

Book

https://www.manning.com/books/the-java-module-system

Stack

https://stackoverflow.com/questions/45777949/whats-the-purpose-of-uses-directive-in-java-9

Other

https://www.oracle.com/corporate/features/understanding-java-9-modules.html

https://www.logicbig.com/tutorials/core-java-tutorial/modules/services.html

MOOC

https://www.lynda.com/Java-tutorials/Learning-Java-9-Modularity/639067-2.html

Cheatsheet

https://www.jrebel.com/blog/java-9-modules-cheat-sheet

3. Concurrency

Book

https://www.amazon.com/gp/product/0321349601/

Javadoc

https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Executor.html

https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ExecutorService.html

https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/CyclicBarrier.html

Trail

https://docs.oracle.com/javase/tutorial/essential/concurrency/locksync.html

4. I/O & NIO

Trail

https://docs.oracle.com/javase/tutorial/essential/io/pathOps.html

https://docs.oracle.com/javase/tutorial/jndi/objects/serial.html

Javadoc

https://docs.oracle.com/javase/8/docs/api/java/nio/file/Paths.html

https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/nio/file/Files.html

https://docs.oracle.com/javase/7/docs/api/java/nio/file/Path.html

https://docs.oracle.com/javase/7/docs/api/java/io/RandomAccessFile.html

5. JDBC

https://docs.oracle.com/javase/tutorial/jdbc/index.html

https://mkyong.com/jdbc/connect-to-oracle-db-via-jdbc-driver-java/

6. Annotations

My articles

https://www.linkedin.com/pulse/java-annotations-vincent-vauban/

Trail

https://docs.oracle.com/javase/tutorial/java/annotations/predefined.html

7. Generics & collections

Trail

https://docs.oracle.com/javase/tutorial/collections/interfaces/order.html

Stack

https://stackoverflow.com/questions/2266827/when-to-use-comparable-and-comparator/31244596#answer-50461038

Javadoc

https://docs.oracle.com/javase/9/docs/api/java/util/Deque.html

https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/TreeSet.html

8. Functional interfaces/ Lambda/ Stream

My articles

https://www.linkedin.com/pulse/java-10-local-type-inference-guidelines-var-vincent-vauban/

Book

https://www.manning.com/books/modern-java-in-action

MOOC (free)

https://apexapps.oracle.com/pls/apex/f?p=44785:50:116796242411980:::50:P50_COURSE_ID,P50_EVENT_ID:104,5438

Javdoc

https://docs.oracle.com/javase/8/docs/api/java/util/stream/package-summary.html (part on reduction)

9. Secure coding

My articles

https://www.linkedin.com/pulse/java-secure-coding-vincent-vauban/

Official

https://www.oracle.com/java/technologies/javase/seccodeguide.html#1

10. Localization/ Exception/ Assertion/ Optional

My articles

https://www.linkedin.com/pulse/java-localization-vincent-vauban/

https://www.linkedin.com/pulse/java-time-api-vincent-vauban/

https://www.linkedin.com/pulse/java-optionals-vincent-vauban/

https://www.linkedin.com/pulse/java-optional-guidelines-vincent-vauban/

Trail

https://docs.oracle.com/javase/tutorial/i18n/index.html

https://docs.oracle.com/javase/tutorial/essential/exceptions/index.html

https://docs.oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html