Matching a number to an element of an integer array.

Dear Gurus,
I am new to Java and trying to write a code where need to match a number 'y' from an array list x[].
If teh number matches, it should give the index value else return the value '-1'
I have written the code and it works...except that when the value doesn't match, it returns '-1' multiple times.
Is there a way that it returns '-1' only once.? Thankyou !

import java.io.*;
public class findLast {
    public static void main(String[] args) {
        try {
            boolean matchFound = false;
            int[] x = {7, 8, 9, 10, 11, 12};
            int y = 4;

            for (int i = x.length - 1; i >= 0 && matchFound == false; i--) {
                if (x[i] == y) {
                    System.out.println("Index is " + i);
                    matchFound = true;
                }
                else if (matchFound == false){
                    System.out.println(-1);
                }
            }

        }
        catch (NullPointerException e) {
            System.out.print("NullPointerException Caught");
        }
    }
}

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Output:

C:\MS\src>java findLast
-1
-1
-1
-1
-1
-1