在Java中,’静态方法’看起来像这样：
class MyUtils {
. . .
public static double mean(int[] p) {
int sum = 0; // sum of all the elements
for (int i=0; i<p.length; i++) {
sum += p[i];
}
return ((double)sum) / p.length;
}
. . .
}
// Called from outside the MyUtils class.
double meanAttendance = MyUtils.mean(attendance);
编写“静态方法”的等效“Ruby方式”是什么？