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    for java 8+

    List<Integer> arrp=arrz,arrn=arrz;
            int size=arrz.size();
            double n=arrn.stream().filter((i)->i<0).count(),
            z=arrz.stream().filter((i)->i==0).count(),
            p=arrp.stream().filter((i)->i>0).count();
            DecimalFormat df = new DecimalFormat("0.000000");
            System.out.println(df.format(p/size));
            System.out.println(df.format(n/size));
            System.out.println(df.format(z/size));``