1、使用谷歌（Google Guava）的Joiner

需要引入Maven:

<groupId>com.google.guava</groupId>

<artifactId>guava</artifactId>

</dependency>

方法很简单，代码也很短

1 2	List<String> list = new ArrayList<>(); String str = Joiner.on(",").join(list);

2、使用collect转换（Java8以上版本才可以）

1 2	List<String> list = new ArrayList<>(); String str = list.stream().map(String::valueOf).collect(Collectors.joining(","))

public class Main {

public static void main(String[] args) {

String[] names = {"Bob", "Alice", "Grace"};

var sj = new StringJoiner(", ");

for (String name : names) {

sj.add(name);

}

System.out.println(sj.toString());

}

1 2	String[] names = {"Bob", "Alice", "Grace"}; var s = String.join(", ", names);