java逗号拼接字符串并且截断最后一个逗号(StrBuilder和substring)
List<String> strings = new ArrayList<>();
strings.add("aa");
strings.add("bb");
strings.add("cc");
StrBuilder strBuilder = new StrBuilder();
for (String s : strings) {
strBuilder.append((s)).append(",");
}
//转换string
String name = strBuilder.toString();
System.out.println(name);//a,b,c,
//截断最后一个字符
String substring = name.substring(0, name.length() - 1);
System.out.println(substring);//a,b,c