StringBuffer A = new StringBuffer("Hello,Java");
String B = "Come On Baby!"
A.append(B,1,3);

以上语句为什么报如下错
cannot resolve symbol
symbol  : method append  (java.lang.String,int,int)
location: class java.lang.StringBuffer
        A.append(B,1,3);
         ^
append()三个参数的方法是怎么用的？


　
　　　　　　

append() contain following usage：
１．append(boolean b)
２．append(char c)
３．append(char[] str)
４．append(char[] str, int offset, int len)
５．append(double d)
６．append(float f)
７．append(int i)
８．append(long l)
９．append(Object obj)
１０．append(String str)
１１．append(StringBuffer sb)

NO.4 is you need,following is usage:
Appends the string representation of a subarray of the char array argument to this string buffer

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