How to find the biggest, second biggest and third biggest number in an array, then display their sequence location?

How to find the biggest, second biggest and third biggest number in an
array, then display their sequence location?

I have this so far:
public static void highV()
{
KeyboardReader reader = new KeyboardReader();
int numVal = 0;
while (numVal < 3) // Makes sure 3 or more numbers are entered
{
numVal = reader.readInt("How many values would you like to enter
(3 or more): ");
if (numVal < 3)
{
System.out.println("Invalid Entry");
}
}
int[] dval = new int[numVal];
int i;
int j;
int k;
int a;
int high = 0;
int sec = 0;
int thr = 0;
System.out.println();
for (i = 0; i < dval.length; i++) // Reads in numbers and stores them
in an array
{
dval[i] = reader.readInt("Enter value number " + (i + 1) + ". ");
}
System.out.println();
System.out.print("List of values: ");
for (j = 0; j < dval.length; j++)// Prints out a list of values
{
if (j == (dval.length)-1)
{
System.out.println(dval[j]);
}
else
{
System.out.print(dval[j] + ", ");
}
}
System.out.println();
System.out.println("There was a total of " + dval.length + " numbers
entered.");
System.out.println();
for (k = 0; k < dval.length; k++) // Determines the highest second
highest and third highest numbers
{
if (dval[k] > high)
{
int oldSec = sec;
sec = high;
thr = oldSec;
high = dval[k];
}
else if (dval[k] > sec)
{
thr = sec;
sec = dval[k];
}
else if (dval[k] > thr)
{
thr = dval[k];
}
}
for (a = 0; a < dval.length; a++) // Determines sequence location of
first second and third highest numbers
{
if (dval[a] == high)
{
high = a+1;
}
if (dval[a] == sec)
{
sec = a+1;
}
if (dval[a] == thr)
{
thr = a+1;
}
}
System.out.println("The highest number was in sequence #: " + high);
System.out.println("The second highest number was in sequence #: " +
sec);
System.out.println("The third highest number was in sequence #: " + thr);
System.out.println();
}
This works for almost everything, except when the numbers entered are all
descending. Example: If you enter 5,4,3,2,1 you get 5,4,3 as answers when
you should get 1,2,3.
If you enter 2,18,5,3,1,0,9,100 however you get the correct answer of 8,2,7
Any ideas?