### Question:
NumberFormatAtomicSignID implements SignIDProvider { @Override public String get() { int maxSignId = provider.get(); return String.format("%03d", maxSignId); } NumberFormatAtomicSignID();  NumberFormatAtomicSignID(String maxSignID); @Override void setCurrentMaxSignId(String maxSignId); @Override String incrementAndGet(); @Override String get(); @Override int parse(String id);  }### Answer:
@Test void get() { NumberFormatAtomicSignID val = new NumberFormatAtomicSignID(); String actual = val.get(); assertEquals("000", actual); }