下面的哪些程序片段可能导致错误()。
- 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”;
正确答案:B,D
答案解析:有
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