Reference Standard

Google Java style

https://google.github.io/styleguide/javaguide.html

Source files are encoded in UTF-8.
Tab characters are not used for indentation; use two spaces
A source file consists of, in order:
License or copyright information, if present
Package statement
Import statements

no wildcard imports

Exactly one top-level class

never split overloads classes
always use braces for if,else,for,do and while
style of braces

return () -> {
  while (condition()) {
    method();
  }
};

return new MyClass() {
  @Override public void method() {
    if (condition()) {
      try {
        something();
      } catch (ProblemException e) {
        recover();
      }
    } else if (otherCondition()) {
      somethingElse();
    } else {
      lastThing();
    }
  }
};

line-wrapping normally at 100, but there are exceptions; wrapped lines indent 4+ spaces

Exactly one blank line separates each section that is present