StringBuffer s = newStringBuffer("happynewyear");s1 = s.substring(5,8);System.out.println(s1);程序输出结果为（） A: ynew B: new C: ewy D: happy
StringBuffer s = newStringBuffer("happynewyear");s1 = s.substring(5,8);System.out.println(s1);程序输出结果为（） A: ynew B: new C: ewy D: happy
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