下面的程序段执行后,输出的结果是以下哪个选项?StringBufferbuf=newStringBuffer("Beijing2008");buf.insert(7,"@");System.out.println(buf.toString());
A.Beijing@2008
B.@Beijing2008
C.Beijing2008@
D.Beijing#2008
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正确答案: A 答案分析:无
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