eclispe运行结果正确，这里运行报错

package array_average;

public class AverageDemo {

float sum;

public float average(float [] arr) {

for (int i = 0; i < arr.length; i++) {

sum=sum+arr[i];

}

float aver;

aver=sum/arr.length;

return aver;

}

public static void main(String[] args) {

// TODO Auto-generated method stub

AverageDemo ArrayNew = new AverageDemo();

float [] arr =new float[] {(float) 78.5,(float) 98.5,(float) 65.5,(float) 32.5,(float) 75.5};

System.out.println("数组的平均值为："+ArrayNew.average(arr));

}

}