Java Coding Problems

232. Consuming a present Optional class

Sometimes, all we want is to consume a present Optional class. If Optional is not present then nothing needs to be done. An unskillful solution will rely on the isPresent()-get() pair, as follows:

// Avoidpublic void displayStatus() {  Optional<String> status = ...; // this is prone to be empty  if (status.isPresent()) {    System.out.println(status.get());  }}

A better solution relies on ifPresent(), which takes Consumer as an argument. This is an alternative to the isPresent()-get() pair when we just need to consume the present value. The code can be rewritten as follows:

// Preferpublic void displayStatus() {  Optional<String> status = ...; // this is prone to be empty status.ifPresent(System.out::println); ...