Consider a parameterless (edit: not necessarily) function that performs a single line of code, and is called only once in the program (though it is not impossible that it'll be needed again in the future).It could perform a query, check some values, do something involving regex... anything obscure or hacky.The rationale behind this would be to avoid hardly-readable evaluations:if (getCondition()) {    // do stuff}where getCondition() is the one-line function.My question is simply: is this a good practice? It seems alright to me but I don't know about the long term...
One-line functions that are called only once
functions
Depends on that one line. If the line is readable and concise by itself, the function may not be needed. Simplistic example:void printNewLine() {  System.out.println();}OTOH, if the function gives a good name to a line of code containing e.g. a complex, hard to read expression, it is perfectly justified (to me). Contrived example (broken into multiple lines for readability here):boolean isTaxPayerEligibleForTaxRefund() {  return taxPayer.isFemale()         && (taxPayer.getNumberOfChildren() > 2         || (taxPayer.getAge() > 50 && taxPayer.getEmployer().isNonProfit()));}