计算int数组中的最大，最小，平均值

public static void testNumber(int[] arr) {      
    int max = arr[0];
    int min = arr[0];
    int avg = 0;
    int sum = 0;
    for (int i = 0; i < arr.length; i++) {
        if (arr[i] > max) {
            max = arr[i];
        }
        if (arr[i] < min) {
            min = arr[i];
        }
        sum += arr[i];
    }
    avg = sum / arr.length;
    network.append("最大：" + max + "ms\n");
    network.append("最小：" + min+ "ms\n");
    network.append("平均：" + avg+ "ms\n");