Just some minor modification to your code will do (with some var renaming for clarity) :

​

double sum = 0; //average will have decimal point

​

for(int i=0; i < args.length; i++){

   //parse string to double, note that this might fail if you encounter a non-numeric string

   //Note that we could also do Integer.valueOf( args[i] ) but this is more flexible

   sum += Double.valueOf( args[i] ); 

}

​

double average = sum/args.length;

​

System.out.println(average );

/**

 * Java Program - Average of Numbers

 */

public class Average {

    public static void main(String[] args) {

        //numbers

        int[] nums = {1, 2, 3, 4, 5, 6};

        float sum = 0;

        //compute sum

        int i=0;

        while(i < nums.length) {

            sum += nums[i];

            i++;

        }

        //compute average

        float average = (sum / nums.length); 

        System.out.println("Average : "+average);

    }

}