Mode

public class Mode {

    public static void main(String []args) {
        int[] arr = new int[] {1,2,2,3,3,4};

        System.out.println(calcMode(arr));

    }

    private static String calcMode(int[] array)
    {
        int[] counts = new int[array.length];
        for (int i = 0; i < array.length; i++) {
            counts[array[i]]++;
        }
        int max = counts[0];
        for (int counter = 1; counter < counts.length; counter++) {
            if (counts[counter] > max) {
                max = counts[counter];
            }
        }

        int[] modes = new int[array.length];

        int j = 0;
        for (int i = 0; i < counts.length; i++) {
            if (counts[i] == max)
                modes[j++] = array[i];
        }

        toString(modes);
        return "";
    }

    public static void toString(int[] array)
    {
        System.out.print("{");
        for(int element: array)
        {
            if(element > 0)
                System.out.print(element + " ");
        }
        System.out.print("}");
    }
}