Explore the allowed method return types to see where the code succeeds… or fails.
Test your knowledge of Java’s primitive operators.
Here’s what happens when good code meets bad people.
You now need only pass a single exam to become a certified Java SE 11 Developer.
Test your knowledge of static fields in Java.
Test your knowledge of abstract classes and their methods.
Test your knowledge of the java.io.Serializable interface.
Test your knowledge of a key object-oriented programming concept.
Test your knowledge of the java.nio.file.Files class.
Test your knowledge of what happens when you use the ExecutorService.
Test your knowledge of Java classes, such as their valid names, the use of variables inside a method, and the number of import statements.
Work with lists while avoiding unpleasant UnsupportedOperationException errors.
Streams are complicated. With the right approach, they can be very efficient too.
Know which command-line utilities are mandatory for distributing applications with a custom JRE.
Do you know how to use Optional? Find out in the latest by Simon and Mikalai.
PreparedStatement sends SQL to a database. Let’s see how it works.
This intermediate-level Java SE 11 certification quiz tests your ability to declare modules and enable access between modules.
This Java certification quiz investigates the meaning of default accessibility and how it influences classes in different packages.
Understanding the checked exception mechanism requires that you understand how to declare a method that throws a checked exception, and how that differs from a method that either does not throw any exceptions or throws only unchecked ones.
See if you know how to improve code by refactoring.