本文仅做为我的平常记录,若有错误以及不当,敬请指出。java
JDK1.8中 String新增 join 方法,省去了之前拼接字符串还要去掉最后一个逗号的操做。数组
使用方法:code
//1.String数组 String [] arr = {"a","b","c"}; String str1 = String.join(",", arr); System.out.println(str1); //输出结果:a,b,c //2.list List strList = new ArrayList(); strList.add("a"); strList.add("b"); strList.add("c"); String str2 = String.join(",", strList); System.out.println(str2); //输出结果:a,b,c //3.StringJoiner 对一组数据中的属性进行拼接 StringJoiner joiner = new StringJoiner(","); String [] arr1 = {"a","b","c"}; for (String string : arr1) { joiner.add(string); } System.out.println(joiner); //输出结果:a,b,c