不知道哪里错了。要求读入个数不确定的数字判断有多少分数大于等于平均数，多少小于平均数，输入负数表示结束

import java.util.Scanner;
public class ha {
public static void main(String[] args) {
System.out.print("Enter a new score:");
Scanner input=new Scanner(System.in);
int[]arr=new int[1];
System.out.println("Enter scores:");
double average=0;double sum=0;int count=0;int m=0;int n=0;
for(int i=1;; i++)
{
arr[i]=input.nextInt();
sum+=arr[i];
average=sum/i;
if(arr[i]<0)
break;
count=i;
}
System.out.print("count is"+count);
System.out.println();
System.out.print("Average is"+average);
for(int i=1;; i++)
{
if(arr[i]>=average)
m++;
else
n++;
}
System.out.print("Number of scores above or equal to the average:"+m);
System.out.println();
System.out.print("Number of scores below the average:"+n);
}
}

你的第二个for循环没有结束条件，成了一个死循环了

 public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        //存放分数
        List<Double> scoreList = new ArrayList<>();
        //累计分数
        Double totalScore = 0.0;
        //循环标记，当输入负数时将tag赋值false
        boolean tag = true;
        while (tag) {
            System.out.println("请输入成绩");
            if( scanner.hasNextLine()) {
                Double s = scanner.nextDouble();
                if( s.compareTo(new Double("0")) < 1) {
                    tag = false;
                }else {
                    scoreList.add(s);
                    totalScore += s;
                }
            }
        }
        //计算
        Double avgScore = totalScore / scoreList.size();
        //高于平均分的人数统计
        int g = 0;
        //低于平均分的人数统计
        int l = 0;
        for( Double score :scoreList) {
            if( score.compareTo( avgScore) >= 0) {
                g++;
            }else {
                l++;
            }
        }
        System.out.println("总分为：" + totalScore + " 平均分为：" + avgScore + " 高于平均分人数：" + g + " 低于平均分人数：" + l);
    }

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