不可变集合,为什么使用它呢?线程安全更有效的利用内存可作为常量
ImmutableMap.<String, Object> builder().put("yananList", yananList).build();
//buider.build返回ImmutableMap
Guava集合和不可变对应关系@参考文章
| 可变集合类型 | 可变集合源：JDK or Guava? | Guava不可变集合 |
| Collection | JDK | ImmutableCollection |
| List | JDK | ImmutableList |
| Set | JDK | ImmutableSet |
| SortedSet/NavigableSet | JDK | ImmutableSortedSet |
| Map | JDK | ImmutableMap |
| SortedMap | JDK | ImmutableSortedMap |
| Multiset | Guava | ImmutableMultiset |
| SortedMultiset | Guava | ImmutableSortedMultiset |
| Multimap | Guava | ImmutableMultimap |
| ListMultimap | Guava | ImmutableListMultimap |
| SetMultimap | Guava | ImmutableSetMultimap |
| BiMap | Guava | ImmutableBiMap |
| ClassToInstanceMap | Guava | ImmutableClassToInstanceMap |
| Table | Guava | ImmutableTable |