Blank lines

Blank lines can improve readability by grouping sections of the code that are logically related. A blank line should also be used in the following places:

1. After the copyright block comment, package declaration, and import section.
2. Between class declarations.
3. Between method declarations.
4. Between the last field declaration and the first method declaration in a class
5. Before a block or single-line comment, unless it is the first line in a block.

Don't use more than one single blank line to separate grouped sections.