List转换为字符串并添加分隔符

// 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);
}

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