public static int[] unique(int[] arr) {
    int temp[] = new int[arr.length];
    boolean[] check = new boolean[arr.length];
    int index = 0;
    for (int i = 0; i < arr.length; i++) {
        if (check[i] != true)
            temp[index++] = arr[i];
        else
            continue;

        int
        var = arr[i];
        for (int j = i + 1; j < arr.length; j++) {
            if (var == arr[j])
                check[j] = true;
        }
    }
    int returnArray[] = new int[index];

    for (int i = 0; i < returnArray.length; i++)
        returnArray[i] = temp[i];

    return returnArray;
}