Getting Numeric Values:获得一个数值
Identifying and Comparing Strings:识别和比较字符串
Replacing Substrings:替换子串
Finding Characters and Substrings:查找字符和子串
Dividing Strings:分割字符串
Combining Strings:拼接字符串
Getting C Strings:得到c语言的字符串
Getting Characters and Bytes:获取字符或字节
Getting a String’s Length:得到字符串的长度
Writing to a File or URL:把内容写到一个文件或者URL里
Creating and Initializing a String from a File:从文件里创建并初始化一个字符串
Deprecated:弃用
Creating and Initializing Strings:创建初始化字符串
tasks:功能
Adopted Protocols:采用的/服从的协议