List<String> 字符串规则拼接

// ‘, ‘ 分隔， ‘ 开始  ‘ 结束
String ids = "";
List<String> list = new ArrayList();
list.add("12345");
list.add("12345");
list.add("12345");
ids = list.stream().map(n -> String.valueOf(n)).collect(Collectors.joining("‘, ‘", "‘", "‘"));
System.out.println(ids);