Joiner.on和stream().map联合使用技巧

List<String> test=new ArrayList<>();
test.add("我");
test.add("你");
String result = Joiner.on("&").join(test);
List<String> collect = test.stream().map(item -> "\"" + item + "\"").collect(Collectors.toList());
String join = Joiner.on("&").join(collect);