// 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);
	}