cdm/src/main/java/ucar/ma2/ArrayObject.java
static ArrayObject factory(DataType dtype, Class elemType, boolean isVlen, Index index) {
    return ArrayObject.factory(dtype, elemType, isVlen, index, null);
  }
static ArrayObject factory(DataType dtype, Class elemType, boolean isVlen, Index index) {
    return ArrayObject.factory(dtype, elemType, isVlen, index, null);
  }
package private. use Array.factory()