这个代码怎么写，求帮助

public class IntArrayUtil {

    public static int getSum(int[] arr) {
        int sum = 0;
        for(int i = 0; i < arr.length; i++){
            sum += arr[i];
        }

        return sum;
    }

    public static int getMax(int[] arr) {
        int Max = arr[0];
        for(int i = 0; i < arr.length; i++) {
            if(Max < arr[i]){
                Max = arr[i];
            }
        }
        return Max;
    }

    public static double getAverage(int[] arr){
        int average = 0;
        for(int i = 0; i < arr.length; i++){
            average += arr[i];
        }

        return (average / arr.length);
    }

    public static void main(String[] args) {
        int[] arr = {1, 2, 3, 5, 6, 7, 8};
        System.out.println("sum= " + getSum(arr));
        System.out.println("max= " + getMax(arr));
        System.out.println("average= " + getAverage(arr));
    }
}