Java数组求和，新手求问

Question

public class T12 {
public static double sumArray(double[] array){
static double sum = 0;
int i;
for(i=0;i<array.length;i++)
sum += array[i];
return sum;
}
public static void main(String[] args) {
double[] array = {1,2,3,4,5,6,7,8,9};
double a;
a = T12.sumArray(double[] array);
System.out.println(a);
}
}
上面代码有什么问题吗，为什么不能运行？

Answer 1

 public class T12 {
public static double sumArray(double[] array){
static double sum = 0; //这里改成  double sum = 0;，局部变量不能定义static
int i;
for(i=0;i<array.length;i++)
sum += array[i];
return sum;
}
public static void main(String[] args) {
double[] array = {1,2,3,4,5,6,7,8,9};
double a;
a = T12.sumArray(double[] array);  //去掉double[] ，传参，不需要数组定义
System.out.println(a);
}
}