here is a solutions with java

int zeros = 0; int positives = 0; int negatives = 0;

for(int numbers : arr){
    if(numbers == 0){
        positives ++;
    }else if(numbers < 0){
        negatives ++;
    }else{
        zeros++;
    }
}
int total = arr.size();

double proportionPositives = (double) positives / total;
double proportionNegatives = (double) negatives/ total;
double proportionzeros = (double) zeros / total;

System.out.printf("%.6f\n", proportionzeros);
System.out.printf("%.6f\n", proportionNegatives);
System.out.printf("%.6f\n", proportionPositives);