num cannot be resolved to a variable in java - arrays

Question

I am creating program to sort the total number of hours employees work in a week in descending order. I am only having one compilation error when I try to execute my code. It says that "num" cannot be resolved to a variable...
The error occurs at following line:
sortHours(num); //Error occurs here
Where am I going wrong?
public class WorkerHours {
public static void main(String[] args) {
int[][] hours = {
{2, 4, 3, 4, 5, 8, 8},
{7, 3, 4, 3, 3, 4, 4},
{3, 3, 4, 3, 3, 2, 2},
{9, 3, 4, 7, 3, 4, 1},
{3, 5, 4, 3, 6, 3, 8},
{3, 4, 4, 6, 3, 4, 4},
{3, 7, 4, 8, 3, 8, 4},
{6, 3, 5, 9, 2, 7, 9}};
int[] weeklyHours = totalHours(hours);
sortHours(num); //Error occurs here
displayDescSort(weeklyHours);
}
public static int[] totalHours(int[][] hours){
int[] result1 = new int[8];
for (int i = 0; i < hours.length; i++){
int sum = 0;
for (int j = 0; j < hours[i].length; j++){
sum += hours[i][j];
}
result1[i] = sum;
}
return result1;
}
public static void sortHours(int[] num){
for (int i = 0; i < num.length - 1; i++){
int currentMax = num[i];
int currentMaxIndex = i;
for (int j = i + 1; j < num.length; j++){
if (currentMax < num[j]){
currentMax = num[j];
currentMaxIndex = j;
}
}
if (currentMaxIndex != i){
num[currentMaxIndex] = num[i];
num[i] = currentMax;
}
}
}
public static void displayDescSort(int[] weeklyHours){
for (int i = weeklyHours.length-1; i >= 0; i--){
System.out.println("Employee" + i + ": " + weeklyHours[i] + " hours");
}
}
}