list转String的几种方法

list转String


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 sb.toString().substring(0,sb.toString().length()-1);}
 
方法二：
public String listToString(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 listToString(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 listToString(List 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();
}