checking if there are equal numbers

[nalinda]

how do i find out if there are equal numbers in an array of random numbers(i.e. how do i knowhow many people share birthdays in an array of random birthdays?)

public static void main (String[] args){ // main method

String groups;
String people;
int b;
int n;
int random;

people = JOptionPane.showInputDialog(" How many people do u want in a group?");
groups = JOptionPane.showInputDialog(" How many groups do u want to simulate?");
b = Integer.parseInt(people);
n = Integer.parseInt(groups);


for (int count = 0; count < n; count++){

int[] array = new int[b];


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

random = (int)(Math.random () * 365) + 1;
array[i] = random;

//System.out.println(array[i]);


}



}


}


}

[hardwired]

Code:

public class CallingFromMain {
    public static void main(String[] args) {
        int[] array = randomArray(50);
        System.out.println("------- array --------");
        print(array);
        int[] uniqueVals = getUniqueValues(array);
        int[] counter = new int[uniqueVals.length];
        for(int j = 0; j < array.length; j++) {
            int index = findIndexIn(uniqueVals, array[j]);
            counter[index]++;
        }
        System.out.println("------- counter --------");
        print(counter);
        System.out.println("-------- results -------");
        System.out.printf("all values in array = %d  unique values = %d%n",
                           array.length, uniqueVals.length);
        int count = 0;
        for(int j = 0; j < counter.length; j++) {
            if(counter[j] > 1)
                count += counter[j]-1;
        }
        System.out.println("Number of duplicate entries = " + count);
    }

    public static int[] randomArray (int num) {
        int[] array = new int[num];
        for (int i = 0; i < array.length; i++) {
            array[i] = (int)(Math.random() * 100) + 1;
        }
        return array;
    }

    private static int[] getUniqueValues(int[] array) {
        int[] uniqueValues = new int[array.length];
        java.util.Arrays.fill(uniqueValues, -1);
        int count = 0;
        for(int j = 0; j < array.length; j++) {
            if(!contains(uniqueValues, array[j]))
                uniqueValues[count++] = array[j];
        }
        int[] retVal = new int[count];
        System.arraycopy(uniqueValues, 0, retVal, 0, count);
        return retVal;
    }

    private static boolean contains(int[] array, int target) {
        for(int j = 0; j < array.length; j++) {
            if(array[j] == target)
                return true;
        }
        return false;
    }

    private static int findIndexIn(int[] array, int target) {
        for(int j = 0; j < array.length; j++) {
            if(array[j] == target)
                return j;
        }
        return -1;
    }

    private static void print(int[] array) {
        for(int j = 0; j < array.length; j++) {
            System.out.print(array[j]);
            if(j < array.length-1)
                System.out.print(", ");
            else
                System.out.println();
        }
    }
}