使用 Java 8，您无需任何第三方库即可完成此操作.

With Java 8 you can do this without any third party library.

如果您想加入一个字符串集合，您可以使用新的 String.join() 方法:

If you want to join a Collection of Strings you can use the new String.join() method:

List<String> list = Arrays.asList("foo", "bar", "baz");
String joined = String.join(" and ", list); // "foo and bar and baz"

如果您的集合类型不是字符串，您可以使用带有 加入收藏家:

If you have a Collection with another type than String you can use the Stream API with the joining Collector:

List<Person> list = Arrays.asList(
  new Person("John", "Smith"),
  new Person("Anna", "Martinez"),
  new Person("Paul", "Watson ")
);

String joinedFirstNames = list.stream()
  .map(Person::getFirstName)
  .collect(Collectors.joining(", ")); // "John, Anna, Paul"

StringJoiner 类可以也很有用.

The StringJoiner class may also be useful.