题目内容

Assuming that str is declared as follows, (假设str声明如下）String str = "RSTUVWXYZ";What value will be returned from str.charAt(5)? （将从str.charAt(5)返回什么值？）

A. U
B. V
C. W
D. X

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What will be the value of matches after the following code is executed? (执行以下代码后，匹配的值是多少？）boolean matches;String[] productCodes = {"456HI345", "3456hj"}; matches = productCodes[0].regionMatches(true, 1,productCodes[1], 2, 3);

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