### 数组转换成以逗号分隔开的字符串 ``` java String[] strArray = {"aaa","bbb","ccc"}； String str= StringUtils.join(strArry,","); System.out.println(str); ``` ### 以逗号分隔开的字符串转换成数组 ```java String str = "aaa,bbb,ccc"; String[] strArray = str.split(","); for(String s : strArray){ System.out.println(s); } ```