Timing a bubble sort execution

Question

I want to be able to see how long it took for a bubble sort to sort all the element in the array. How do I measure the time?

public class Bubble {
    static int[] nums = {5, 4, 3, 2, 1}; 

    public static void main(String[] args) {
        bubble(nums);
        for(int i=0; i<nums.length; i++){
            System.out.print(nums[i] + " ");
        }
    }

    // bubble sort
    public static void bubble(int[] unsorted){
        int temp;
        boolean sorted = false;
        int length = unsorted.length;

        while(!sorted){
            sorted = true;

            for(int i=0; i<length-1; i++){
                if(unsorted[i] > unsorted[i+1]){
                    temp = unsorted[i];
                    unsorted[i] = unsorted[i+1];
                    unsorted[i+1] = temp;
                    sorted = false;
                }
            }
        }
    }
}

Answer 1

From Diastrophism's answer to how do I time a methods excecution in java:

There is always the old-fashioned way:

long startTime = System.nanoTime();
methodToTime();
long endTime = System.nanoTime();

long duration = endTime - startTime;