单项选择题
class Top {
static int x = 1;
public Top(int y) { x *= 3; }
}
class Middle extends Top {
public Middle() { x += 1; }
public static void main(String [] args) {
Middle m = new Middle();
System.out.println(x);
}
}
结果为:()
A.1
B.2
C.3
D.编译失败
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