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已知如下定义:String s = "story"; 下面哪个语句不是合法的( )(本题2.0分)
A. s += "books";
B. s = s + 100;
C. int len = s.length;
D. String t = s + “abc”;
A. s += "books";
B. s = s + 100;
C. int len = s.length;
D. String t = s + “abc”;
参考答案
