基于guava转换String，List/Map
Joiner用于List、Map转String
Splitter用于String转List、Map
本文只列出简单用法，Joiner、Splitter中还有很多包括去重复等操作
List–>String

List<String> names = Lists.newArrayList("John", "Jane", "Adam", "Tom");
String result = Joiner.on(",").join(names);

assertEquals(result, "John,Jane,Adam,Tom");

String–>List

String input = "apple - banana - orange";
List<String> result = Splitter.on("-").trimResults().splitToList(input);

Map–>String

      String to List/Map Splitter
      List/Map to String Joiner
      Map<String, Integer> salary = Maps.newHashMap();
            salary.put("John", 1000);
            salary.put("Jane", 1500);
            String result = Joiner.on(" , ").withKeyValueSeparator(" = ")
                                            .join(salary);

String–>Map

      String input = "John=first,Adam=second";
            Map<String, String> result = Splitter.on(",")
                                                 .withKeyValueSeparator("=")
                                                 .split(input);

            assertEquals("first", result.get("John"));
            assertEquals("second", result.get("Adam"));

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