Overloaded methods must be valid, and all ambiguities must be resolved.

Java control statements can be confusing to learn and use correctly.

Parentheses make a real difference in the results of an evaluation.

You’re tasked with moving an application to JPMS. What’s the command line?

The consumer interface can be confusing, even for advanced coders.

Predicate interfaces can be complicated, so be careful when working out the results.

Can a lambda return a lambda?

Define and implement functional interfaces that work as expected.

The subtleties of using var in lambda expressions

Using var with two-dimensional arrays requires careful attention.

The subtleties of using enums in a switch statement

The effects of declaring a class final

What fields can you access from default methods in interfaces?

When two object references point to the same StringBuilder instance, how are changes propagated?

Nuances of variable scope in for-loops

Java’s mechanisms and syntax for defining classes inside other classes

The subtleties of string concatenation

The scope rules of Java variables and an examination of shadowing

The subtleties of using a constructor to create an array

When exactly do you need to declare an exception?