invoiceId = optionalInvoiceIDInfo.isPresent() ? optionalInvoiceIDInfo.get().getInvoiceID() : null; code example

Example 1: check if optional is empty java

@Test
public void givenNull_whenCreatesNullable_thenCorrect() {
    String name = null;
    Optional<String> opt = Optional.ofNullable(name);
    assertFalse(opt.isPresent());
}

Example 2: check if optional is empty java

String o = getOptional().orElse(null);
if (o == null) {
    return;
}