public boolean startWith(String start) throws IOException{
        char[] cs = start.toCharArray();
        int i = 0;
        for(;i < cs.length; i ++){
            if(peek(i) != cs[i]){
                return false;
            }
        }
        return true;
    }
public boolean startWith(String start) throws IOException{
        char[] cs = start.toCharArray();
        int i = 0;
        for(;i < cs.length; i ++){
            if(peek(i) != cs[i]){
                return false;
            }
        }
        return true;
    }
public boolean startWith ( String start ) throws IOException { char [ ] cs = start . toCharArray ( ) ; int i = 0 ; for ( ; i < cs . length ; i ++ ) { if ( peek ( i ) != cs [ i ] ) { return false ; } } return true ; }
是否以 start 开始
@param start
@return true, 如果的确以指定字符串开始
@throws IOException
是否以 start 开始