1. string API

Integer i = list.size(); — List的size方法可以得到List的长度

Integer i = array.length; — 数组的length属性可以得到数组的长度

Integer i = string.length(); — String的length方法可以得到String的长度
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1.1 Charset

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1.2 StringToArray

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1.3 string 转为list

  1. ** 先转为数组,再转为list**<br />![image.png](https://cdn.nlark.com/yuque/0/2022/png/22435741/1648049222042-24823a58-432c-460d-bc3d-7fc3fbed7a83.png#clientId=u7183b9f0-ff34-4&crop=0&crop=0&crop=1&crop=1&from=paste&height=302&id=u2a0b6072&margin=%5Bobject%20Object%5D&name=image.png&originHeight=302&originWidth=1277&originalType=binary&ratio=1&rotation=0&showTitle=false&size=34381&status=done&style=none&taskId=ubc8b71f4-9c6b-49bd-973a-be53d8803fd&title=&width=1277)