One piece of programming advice is that one shouldn't use numbers in code unless they're stored in a variable or constant. Using a number as a bare value – often called a "magic number" – gives no context as to why that number is being used.
totalWidth = getSize() + 272;
272? Why not
113? Instead, one is encouraged to use constants.
final int WINDOW_PADDING = 272; totalWidth = getSize() + WINDOW_PADDING;
This is better, because it prevents typos. But simply using a constant doesn't ensure readability. In string variables, there's an antipattern I'm calling magic strings .
final String USE_FOOBAR_SYSTEM = "use_foobar_system";
While the value is stored in a variable, the variable name merely repeats this value. The name doesn't help the reader understand what it's there for. These variables are no better than a numeric constant like:
final int THREE_HUNDRED_SEVENTY_TWO = 372;
The code does use a constant, but its name doesn't explain why the constant is there. Better to give it a name that explains what it's used for.
final String FOOBAR_SYSTEM_FEATURE_FLAG_NAME = "use_foobar_system";
This way, the name alone clearly indicates what it's used for. And clarity is a great goal to have in programming. As Harold Abelson and Gerald Jay Sussman have said,
…programs must be written for people to read, and only incidentally for machines to execute.