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# Untitled

a guest Sep 19th, 2019 96 Never
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1. package com.company;
2. import java.io.FileNotFoundException;
3. import java.util.*;
4. import java.io.File;
5.
6.
7. public class Main {
8.
9.     public static void main(String[] args) {
10.         String fileName = "Property_Assessment_data_2019.csv";
11.         // We are going to read from a .csv file, Comma Separated Value File
12.         Integer[] assessedValues = getAssessedValues(fileName);
13.         //Now we sort the array
14.         Arrays.sort(assessedValues);
15.         System.out.println("Descriptive statistics of " + fileName);
16.         System.out.println("n = "+ getN(assessedValues));
17.         System.out.println("min = " + getMin(assessedValues));
18.         System.out.println("max = " + getMax(assessedValues));
19.         System.out.println("range = " + getRange(assessedValues));
20.         System.out.println("mean = " + getMean(assessedValues));
21.         System.out.println("sd = " + getsd(assessedValues));
22.         System.out.println("Median = " + getMedian(assessedValues));
23.
24.
25.
26.     }
27.     private static double getMedian(Integer[] args){
28.         double Median = 0;
29.         int totalElements= args.length;
30.         if (totalElements % 2 == 0){
31.             int sumMiddle = args[totalElements/2] + args[totalElements/2 -1];
32.             //now get average of the middle elements
33.             Median = (double) sumMiddle /2;
34.         }
35.         else{
36.             Median = (double) args[totalElements/2];
37.         }
38.         return  Median;
39.     }
40.     private static double getsd(Integer[] args){
41.         double sd = 0;
42.         double average = getMean(args);
43.         for (int i=0; i<args.length;i++){
44.             sd = sd + Math.pow(args[i] - average, 2);
45.
46.         }
47.         return sd;
48.     }
49.     private static double getMean(Integer[] args){
50.         double sum = 0;
51.         double sd = 0;
52.         for (int i = 0; i< args.length; i++){
53.             sum += args[i];
54.         }
55.         return sum / args.length;
56.     }
57.     private static Integer getRange(Integer[] args){
58.         int max = getMax(args);
59.         int min = getMin(args);
60.         return max-min;
61.     }
62.     private static Integer getMax(Integer[] args){
63.         int last = args.length -1;
64.         return args[last];
65.     }
66.     private static Integer getMin(Integer[] args){
67.         return args[0];
68.     }
69.     private static Integer getN(Integer[] args){
70.         int length = args.length;
71.         return length;
72.     }
73.     //This method opens the file, and gets all the assessed values from the csv file, then stores them inside of an Integer array.
74.     public static Integer[] getAssessedValues(String args){
75.         ArrayList<Integer> assessedValues = new ArrayList<Integer>();
76.         String fileName = "Property_Assessment_Data_2019.csv";
77.         File file = new File(fileName);
78.         try{
79.             Scanner inputStream = new Scanner(file);
80.             inputStream.nextLine(); //We ignore first line.
81.             while (inputStream.hasNext()){
82.                 String data = inputStream.nextLine();
83.                 String[] values = data.split(",");
84.                 //Here we need to parse int, as it is a string, so we store each asssessed value as an int.
85.                 int parsed = Integer.parseInt(values[4]);
86.                 //Here we add the parsed integer to our array list
88.             }
89.             //Here we convert the array list to an object array.
90.             inputStream.close();
91.
92.         } catch (FileNotFoundException e){
93.             e.printStackTrace();
94.         }
95.         //Here we return the assessedValues with toArray, converting it into a new Integer array.(IDE did this)
96.         return assessedValues.toArray(new Integer[0]);
97.     }
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