【转】将List集合用字符串，逗号隔开进行拼接
转自：https://blog.csdn.net/albb_/article/details/83012139
先上效果：
就当是做笔记，以后可以自己查看，也可以再用到的时候随时拿来用。
直接上代码：
public class ArraySplicing {
private static String[] array = {"张三", "李四", "王五", "撒娇", "九点十几分", "没事", "圣诞节"};
private static String str;
public static void main(String[] args) {
List<String> list = new ArrayList<>();
for (int i = 0; i < array.length; i++) {
list.add(array[i]);
}
/**
*
* 将集合用字符串，逗号隔开拼接
* */
//第一种方法(灵活，可以用逗号隔开，用|线隔开)
str = StringUtils.join(list, ",");
System.out.println("第一种方法" + str);
//第二种方法
str = listToString1(list);
System.out.println("第二种方法" + str);
//第三种方法(灵活，可以用逗号隔开，用|线隔开)
str = listToString2(list, ',');
System.out.println("第三种方法" + str);
//第四种方法
str = listToString3(list, ",");
System.out.println("第四种方法" + str);
Separator separator=new Separator(",");
//第五种方法
str = listToString4(list, separator );
System.out.println("第五种方法"+str);
}
public static String listToString1(List<String> list) {
StringBuilder sb = new StringBuilder();
if (list != null && list.size() > 0) {
for (int i = 0; i < list.size(); i++) {
if (i < list.size() - 1) {
sb.append(list.get(i) + ",");
} else {
sb.append(list.get(i));
}
}
}
return sb.toString();
}
public static String listToString2(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);
}
public static String listToString3(List list, String 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();
}
public static 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 static 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();
}
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