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int indexOf(char ch)或indexOf(String str)
int indexOf(char ch, int fromIndex) 或 indexOf(String str, int fromIndex)
int lastIndexOf(char ch) 或 lastIndexOf(String str)
int lastIndexOf(char ch, int fromIndex) 或 lastIndexOf(String str, int fromIndex)
String[] split(String regex)
String substring(int beginIndex)
String substring(int beginIndex, int endIndex)
String replace(char oldChar, char newChar)
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