CalcData

public class CalcData {
public static void main(String args) {
double data;
data = new double[6];
data[0] = 3.1;
data[1] = 4.1;
data[2] = 5.9;
data[3] = 2.6;
data[4] = 5.3;
data[5] = 9.7;
double sum = 0.0;

// i<=data.length としないこと！
// data.lengthは6だから、data[6]なんてない！
for (int i = 0; i < data.length; i++) {
sum += data[i];
}
System.out.println("sum = " + sum);
}
}