java 将list转换成string

可以使用Java中的join()方法将List转化为String。例如：

List<String> list = Arrays.asList("apple", "banana", "orange");
String result = String.join(",", list);
System.out.println(result); // "apple,banana,orange"

也可以使用StringBuilder类进行拼接，例如：

List<String> list = Arrays.asList("apple", "banana", "orange");
StringBuilder sb = new StringBuilder();
for(String s: list) {
    sb.append(s);
    sb.append(",");
}
String result = sb.toString();
System.out.println(result); // "apple,banana,orange,"

或者使用Java 8 的 Stream API

List<String> list = Arrays.asList("apple", "banana", "orange");
String result = list.stream().map(Object::toString).collect(Collectors.joining(","));
System.out.println(result); // "apple,banana,orange"

可以根据需要来选择使用哪种方法。