Lottery. Generate 6 random numbers untill they match your guess. Do this until you hit jackpot. Once you hit jackpot , repeat that 25 times.

scratch.java

import java.lang.Math;
import java.util.Random;
import java.util.Arrays;
public class scratch
{

    public static void main ( String [] args )
    {
        int lottoNums[] =  new int [6];
        int myNums[] = {1,13,15,22,41,36};
        int countMatched = 0;

        /*	for (int i = 0; i < 6; i++)
                {
                        lottoNums[i] = getRandomInt(1,41);
                }

        	System.out.println(lottoNums.length);

        	for (int i = 0; i < 6; i++)
                {
                        System.out.print(lottoNums[i] + "#");
                }

          */
        for (int x = 1; x<= 25; x++)
            {

                System.out.println("Game #" + x);
                while (true)
                    {
//System.out.println("generating numbers");
                        for (int i = 0; i < 6; i++)
                            {
                                lottoNums[i] = getRandomInt(1,41);
                            }
                        if (hasDuplicates(lottoNums))
                            {
//System.out.println("Duplicates found");
                                continue;
                            }

                        /*
                        	     Arrays.sort(lottoNums);

                        for(int i = 1; i < numbers.length; i++) {
                            if(numbers[i] == numbers[i - 1]) {
                                continue;
                            }
                        }
                        */
///////////////////////////////////////////


                        /*                for (int i = 0; i < 6; i++)
                                            {
                                                System.out.print(lottoNums[i] + "#");
                                            }
                                        System.out.printf ("\n");
                        */


                        //compare myNums to lottoNums
                        // count matched numbers
                        //System.out.println("Comparing");
                        for (int i = 0; i < 6; i++)
                            {
                                for (int j = 0 ; j < 6; j++)
                                    {
                                        if (lottoNums[j] == myNums[i])
                                            countMatched++;
                                    }
                            }
                        // if we matched 6 numbers, we've got a jackpot
                        if ( countMatched == 6 )
                            {
                                System.out.println("Jackpot");
                                break;
                            }
                        /*else if (countMatched == 3)
                        { System.out.println("Matched 3");} */
                        //we didn't match 6, so reset the counter
                        countMatched = 0;

                    }
            }
    }

    public static int getRandomInt (int low, int high)
    {
        int out;
//out = low + (int)(Math.random()*((high-low) + 1 ));
        Random rand = new Random();
        out = rand.nextInt((high - low) + 1) + low;
//        if (out == 0 || out == 42)
//            System.out.print("ERROR" + out);
        return out;
//System.out.print(out + "\n");
    }



    public static boolean hasDuplicates (int[] a)
    {
        boolean result = false;
        Arrays.sort(a);

        for(int i = 1; i < a.length; i++)
            {
                if(a[i] == a[i - 1])
                    {
                        result = true;
                    }
            }
        return result;

    }
}

Optimizations:

• int getRandomInt(int low, int high): Make the Random object static and don't create a new instance of it every time!
• Don't use the hasDuplicates function. Use a LinkedHashSet instead of an array to store the numbers. That will not store duplicate items. Just keep filling numbers into it until its size is big enough.
• This is probably not faster but better style: Don't compare every lotto number with every guessed number, I would sort both lists instead e.g. with Arrays.sort(int[] a) and compare each corresponding item only.

• Class names starts with an uppercase character Scratch instead of scratch
• import java.lang.Math; is never used
• Change the visibility (private) for getRandomInt and hasDuplicates. No need for public