1491. Average Salary Excluding the Minimum and Maximum Salary 

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class Solution {
    public double average(int[] salary) {
        int sum = 0;
        int max = salary[0], min = salary[0];
        for (int s : salary) {
            sum += s;
            max = Math.max(max, s);
            min = Math.min(min, s);
        }

        return ((double) sum - max - min) / (salary.length - 2);
    }
}

References

1491. Average Salary Excluding the Minimum and Maximum Salary