### Question:
ParseDouble implements IsParser<Double> { @Override public Double parse(Object o, Field field) { return isValid(o) ? Double.valueOf(o.toString()) : null; }  @Override Double parse(Object o, Field field); @Override void setCell(Double o, Cell cell, Field field);  }### Answer:
@Test public void parse() throws Exception { Double actual = parseDouble.parse(null, null); assertEquals(null, actual); actual = parseDouble.parse("123.12", null); assertEquals(expected, actual); }