### Question:
Dimensions { public static String makeDimensionsString(List<Dimension> dimensions) { if (dimensions == null) return ""; Formatter buf = new Formatter(); for (int i = 0; i < dimensions.size(); i++) { Dimension myd = dimensions.get(i); String dimName = myd.getShortName(); if (i != 0) buf.format(" "); if (myd.isVariableLength()) { buf.format("*"); } else if (myd.isShared()) { buf.format("%s", dimName); } else { buf.format("%d", myd.getLength()); } } return buf.toString(); } private  Dimensions(); static ucar.ma2.Section.Builder makeSectionFromDimensions(Iterable<Dimension> dimensions); static long getSize(Iterable<Dimension> dimensions); static int[] makeShapeAll(Variable v); static int[] makeShape(Iterable<Dimension> dimensions); static String makeDimensionsString(List<Dimension> dimensions); static ImmutableList<Dimension> makeDimensionsList(FindDimensionByName finder, String dimString); static ImmutableList<Dimension> makeDimensionsAnon(int[] shape); static ImmutableList<Dimension> makeDimensionsAll(Variable v);  }### Answer:
@Test public void testMakeDimensionString() { Dimension dim = new Dimension("dimname", 5); Dimension anon = Dimension.builder().setLength(5).setIsShared(false).build(); assertThat(Dimensions.makeDimensionsString(ImmutableList.of(dim, anon))).isEqualTo("dimname 5"); assertThat(Dimensions.makeDimensionsString(null)).isEqualTo(""); }