public static void plusMinus(List<Integer> arr) {
    int quantityPositive = 0;
    int quantityNegative = 0;
    int quantityZero = 0;
    BigDecimal resultPositive = BigDecimal.valueOf(0);
    BigDecimal resultNegative = BigDecimal.valueOf(0);
    BigDecimal resultZero = BigDecimal.valueOf(0);

    for(int i = 0; i < arr.size(); i++ ){
        if(arr.get(i) > 0){
            quantityPositive++;
            resultPositive = BigDecimal.valueOf(quantityPositive).divide(BigDecimal.valueOf(arr.size()), 6, RoundingMode.HALF_UP);
        }else if(arr.get(i) < 0){
            quantityNegative++;
            resultNegative = BigDecimal.valueOf(quantityNegative).divide(BigDecimal.valueOf(arr.size()), 6, RoundingMode.HALF_UP);
        }else{
            quantityZero++;
            resultZero = BigDecimal.valueOf(quantityZero).divide(BigDecimal.valueOf(arr.size()), 6, RoundingMode.HALF_UP);
        }


    }

        System.out.println(resultPositive);
        System.out.println(resultNegative);
        System.out.println(resultZero);
}