Hello guys need help with reverse array

Question

Need help reversing an array, i think my code is correct but it still does not work, so im thinking it might be something else i do not see.
so far the input for the array is
6, 25 , 10 , 5
and output is still the same
6 , 25 , 10 , 5
not sure what is going on.
public class Purse
    // max possible # of coins in a purse
    private static final int MAX = 10;
    private int contents[];
    private int count;      // count # of coins stored in contents[]
     * Constructor for objects of class Purse
    public Purse()
       contents = new int[MAX];
       count = 0;
     * Adds a coin to the end of a purse
     * @param  coinType     type of coin to add
    public void addCoin(int coinType)
        contents[count] = coinType;
        count = count + 1;
     * Generates a String that holds the contents of a purse
     * @return     the contents of the purse, nicely formatted
    public String toString()
        if (count == 0)
            return "()";
        StringBuffer s = new StringBuffer("(");
        int i = 0;
        for (i = 0; i < count - 1; ++i)
            s.append(contents[i] + ", "); // values neatly separated by commas
        s.append(contents[i] + ")");
        return s.toString();
     * Calculates the value of a purse
     * @return     value of the purse in cents
    public int value()
        int sum = 0; // starts sum at zero
        for( int e : contents) // sets all to e
            sum = sum + e; //finds sum of array
        return sum; //retur
     * Reverses the order of coins in a purse and returns it
    public void reverse()
       int countA = 0;
       int x = 0;
       int y = countA - 1;                                          // 5 - 1 = 4
       for (int i = contents.length - 1; i >=0 ; i--)                        // 4, 3 , 2, 1, 0
            countA++;                                             // count = 5
        while ( x < y)
            int temp = contents[x];
            contents[x] = contents [y];
            contents [y] = temp;
            y = y- 1;                                         // 4 , 3 , 2, 1 , 0
            x = x + 1 ;                                             // 0 , 1,  2  , 3 , 4
}

Answer 1

ok so i went ahead and followed what you said
public void reverse()
      int a = 0;
      int b = contents.length - 1;
      while (b > a)
          int temp = contents[a];
          contents[a] = contents;
contents [b] = temp;
a++;
b--;
}and its outputting { 0, 0, 0, 0}
im thinking this is because the main array is has 10 elements with only 4 in use so this is a partial array.
Example
the array is { 6, 25, 10, 5, 0, 0, 0, 0, 0, 0,}
after the swap
{0, 0 , 0 , 0, 0 , 0 , 5 , 10 , 25, 6}
i need it to be just
{ 5, 10, 25, 6}
so it is swapping the begining and end but only with zeroes the thing is i need to reverse the array without the zeroes