### Question:
CollectionField implements FieldType { @Override public Object getDefaultValue() { return null; } CollectionField(final Types type, final Types subType); @Override Types getType(); Types getSubType(); @Override Object getDefaultValue(); @Override boolean hasDefaultValue(); @Override Object convert(Object objValue); @Override JSONObject toJson();  }### Answer:
@Test public void testGetDefaultValue() throws OperationException { System.out.println("getDefaultValue"); CollectionField instance = null; instance = new CollectionField(Types.ARRAY, Types.STRING); assertNull(instance.getDefaultValue()); instance = new CollectionField(Types.MULTISET, Types.STRING); assertNull(instance.getDefaultValue()); }