java List转换为字符串并加入分隔符的一些方法总结

// 方法一：public String listToString(List list, char separator) {StringBuilder sb = new StringBuilder();for (int i = 0; i < list.size(); i++) {sb.append(list.get(i)).append(separator);}return list.isEmpty()?"":sb.toString().substring(0, sb.toString().length() - 1);}// 方法二：public String listToString2(List list, char separator) {StringBuilder sb = new StringBuilder();for (int i = 0; i < list.size(); i++) {if (i == list.size() - 1) {sb.append(list.get(i));} else {sb.append(list.get(i));sb.append(separator);}}return sb.toString();}// 方法三：public String listToString3(List list, char separator) {StringBuilder sb = new StringBuilder();for (int i = 0; i < list.size(); i++) {sb.append(list.get(i));if (i < list.size() - 1) {sb.append(separator);}}return sb.toString();}// 方法四：public class Separator {private String next = "";private String separator;public Separator(String separator) {this.separator = separator;}public String get() {String result = next;next = separator;return result;}}public String listToString4(List<String> list, Separator separator) {StringBuilder sb = new StringBuilder();for (String s : list) {if (s != null && !"".equals(s)) {sb.append(separator.get()).append(s);}}return sb.toString();}// 方法五：public String listToString5(List list, char separator) {return org.apache.commons.lang.StringUtils.join(list.toArray(),separator);}

总结：方法五在实际应用中最多，因为它已经被封装好了，速度也很好