题目内容

What will be printed after the following code is executed?（下列代码执行后打印的结果是？）String str = "abc456"; int m = 0;while ( m < 6 ){if (Character.isLetter(str.charAt(m))) System.out.print(Character.toUpperCase(str.charAt(m)));m++;}

A. abc456
B. ABC456
C. ABC
D. 456

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