多項(xiàng)選擇題

下面哪段語法執(zhí)行正確()

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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