### Question:
StringField implements FieldType<String> { public long getLength() { return length; } StringField(final Types type);  StringField(final String defaultValue, final Types type);  StringField(final Types type, final String length);  StringField(final Types type, final String length, final String defaultValue); @Override Types getType(); long getLength(); @Override String getDefaultValue(); @Override boolean hasDefaultValue(); @Override String convert(Object objValue); @Override JSONObject toJson();  }### Answer:
@Test public void testGetLength() throws OperationException { System.out.println("getLength"); StringField instance = new StringField(Types.STRING); assert (instance.getLength() < 0); instance = new StringField(Types.STRING, "10"); assertEquals(10, instance.getLength()); instance = new StringField(Types.STRING, "10K"); assertEquals(10 * 1024, instance.getLength()); instance = new StringField(Types.STRING, "20M"); assertEquals(20 * 1024 * 1024, instance.getLength()); instance = new StringField(Types.STRING, "30G"); assertEquals(30 * 1024 * 1024 * 1024, instance.getLength()); }