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import java.util.List;

public class AverageArrary {
        public static double useArray(List list)
        {
                double sum=0;
                double average=0;
                int m = list.size();
                for (int i = 0; i < m; i++) {
                        sum +=  Double.parseDouble(list.get(i).toString()) ;// ÿ¸öÔªËØÖµÀÛ¼Ó
                        average = sum/m;
        }
                return average;

    }
        public static void main(String[] args) throws ClassNotFoundException

        {
                List lista=QueryDesc.showUser();
                double result=useArray(lista);
                System.out.println(result);
        }
}

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Exception in thread "main" java.lang.NumberFormatException: For input string: "Water.UserVo@16fa474"
        at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
        at java.lang.Double.parseDouble(Unknown Source)
        at Water.AverageArrary.useArray(AverageArrary.java:12)
        at Water.AverageArrary.main(AverageArrary.java:22)
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4Â¥: Originally posted by rbs at 2014-05-09 08:19:45
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