What method signature will work with this code? boolean healthyOrNot = isHealthy("avocado");

Which are valid keywords in a Java module descriptor (module-info.java)?

Which type of variable keeps a constant value once it is assigned?

How does the keyword volatile affect how a variable is handled?

You get a NullPointerException. What is the most likely cause?

If you encounter UnsupportedClassVersionError it means the code was ___ on a newer version of Java than the JRE ___ it.

What is the keyword to forbid the serialization of an instance field?

Which method is used to sort a Collection by natural order of its elements?

In Math and other java.lang Classes, generally all methods are declared _.

What is an abstract class?

Any source code valid for one version of Java is also valid for all previous versions of Java.