The Java Shell makes it easy to practice with variable declaration and initialization, as you can see in the examples below (note that semicolon terminators aren’t required).

Java SE 10 (March 2018) introduced type inference for local variables. Java Language Architect Brian Goetz explains the feature.

Give variables and methods logical names Another best practice on how to write clean code in Java is to assign logical, human-readable names to methods, variables, functions and other objects within ...

The method I presented here might not work well in multithreaded code. There's a high chance not all threads will see the variable change immediately so that it might cause some additional problems.