class heikin {
public static void main(String args[]) {
int kokugo[] = {85, 55, 92};
int suugaku[] = {64, 77, 80};
int rika[] = {98, 69, 88};
int syakai[] = {70, 60, 95};
int eigo[] = {72, 52, 85};
int sum[] = new int[5];
doubule avg[] = new double[5];

for (int i = 0; i < 3; i++) {
sum[0] = sum[0] + kokugo[i];
sum[1] = sum[1] + suugaku[i];
sum[2] = sum[2] + rika[i];
sum[3] = sum[3] + syakai[i];
sum[4] = sum[4] + kokugo[i];
}
System.out.println(sum[0]);
System.out.println(sum[1]);
System.out.println(sum[2]);
System.out.println(sum[3]);
System.out.println(sum[4]);
}
}

これ短くするのって2次元配列とかいうの使わないと駄目なの？