java平均值

⑴ JAVA求数组平均值

这样应该行
public class Test20
{

public static double[] a1(double[]...a)
{
double[] suma=new double[a.length];
for(int i=0;i<a.length;i++){
double sum=0;
for(int j=0;j<a[i].length;j++){
sum+=a[i][j];
if(j==(a[i].length-1)){
suma[i]=sum/a[i].length;
}
}
}
return suma;
}
public static void main(String[] args) {
// TODO Auto-generated method stub
double a2;
double b2;
double c2;
double d2;

double a[]={90,85,66,51,69,78,88,94};
double b[]={68,88,81,90,65,74,64,46};
double c[]={68,90,85,88,68,70};
double d[]={60};

double[] avg=a1(a,b,c,d);
a2=avg[0];
b2=avg[1];
c2=avg[2];
d2=avg[3];
System.out.println(a2+","+b2+","+c2+","+d2);
}
}