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                            ### [`CharSequence`](https://lingcoder.gitee.io/onjava8/#/book/18-Strings?id=charsequence)

接口`CharSequence`從`CharBuffer`、`String`、`StringBuffer`、`StringBuilder`類中抽象出了字符序列的一般化定義：

~~~
interface CharSequence {   
    char charAt(int i);   
    int length();
    CharSequence subSequence(int start, int end);
    String toString(); 
}
~~~

因此，這些類都實現了該接口。多數正則表達式操作都接受`CharSequence`類型參數。

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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