题目内容

若有定义String key ="我是信工学院的学生";则key.length()的值是

A. 0
B. 9
C. 10
D. 18

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执行StringBuffer s = new StringBuffer("abc"); s.insert(1,"Good"); s的正确结果是()

A. s="aGoodbc"
B. s="abcGood"
C. s="Goodabc"
D. s="abGoodc"

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下面哪段语法执行正确? (多选)

A. String s = "Gone with the wind";String t = " good ";String k = s + t;
B. String s = "Gone with the wind";String t;t = s[3] + "one";
C. String s = "Gone with the wind";String standard =s.toUpperCase();
D. String s = "home directory";String t = s - "directory";

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