SetGenerators.java 文件源码

@Override
protected List<String> create(String[] elements) {
  Comparator<String> comparator = createExplicitComparator(elements);
  ImmutableSortedSet.Builder<String> builder = ImmutableSortedSet.orderedBy(comparator);
  builder.add(BEFORE_FIRST);
  builder.add(BEFORE_FIRST_2);
  builder.add(elements);
  builder.add(AFTER_LAST);
  builder.add(AFTER_LAST_2);
  return builder
      .build()
      .subSet(BEFORE_FIRST_2, AFTER_LAST_2)
      .asList()
      .subList(1, elements.length + 1);
}