Question

import java.util.*;
  
public class DataAnalysis{

   static Set<String> Data_NaN(Set<String> set){
       Set<String> set2 = new HashSet<String>();
   for (String temp : set) {
       temp = temp.replaceAll(
       "[^0-9]", "");
         
       if(!(set.isEmpty())){
           set2.add(temp);
       }

   }
   return set2;
          
   }
public static void main(String args[])
{
// create empty set
Set<String> set = new HashSet<String>();
// {3, 25, 33, 21, 55, 43, 78, 31, 33, 75, 43, 11, 36, 4, 10, 99, A, B, C}
// add values one by one in set
set.add("03");
set.add("25");
set.add("33");
set.add("21");
set.add("55");
set.add("43");
set.add("78");
set.add("31");
set.add("33");
set.add("75");
set.add("43");
set.add("11");
set.add("36");
set.add("04");
set.add("10");
set.add("99");
set.add("A"); set.add("B"); set.add("C");
// print input set
System.out.println("Set: " + set);
// call funtion Data_NaN to filter out non-numerical data
System.out.println("After filtering nonnumerical data- Set: "+Data_NaN(set));
// call funtion Data_Min to calculate min value
System.out.println("Minimum number from set is= "+Data_Min(set));
  
}
   static String Data_Min(Set<String> set) {
       String obj = Collections.min(set);  
       return obj;
   }
}

output: After filtering nonnumerical data: [33, 55, 11, 99, , 78, 25, 36, 3, 4, 31, 75, 21, 43, 10]
Minimum value After filtering nonnumerical data:

Question:. this is a dataset given{3, 25, 33, 21, 55, 43, 78, 31, 33, 75, 43, 11, 36, 4, 10, 99, A, B, C} why Data min method does not print any thing? I need to find maximum value, average value, median, mode, order it small to large using numerical data of given dataset in separate methods.

Answer 1

import java.util.*;

public class DataAnalysis {

        static Set<String> Data_NaN(Set<String> set) {
                Set<String> set2 = new HashSet<String>();
                for (String temp : set) {
                        temp = temp.replaceAll("[^0-9]", "");

                        if (!(set.isEmpty())) {
                                set2.add(temp);
                        }

                }
                return set2;

        }

        public static void main(String args[]) {
// create empty set
                Set<String> set = new HashSet<String>();
// {3, 25, 33, 21, 55, 43, 78, 31, 33, 75, 43, 11, 36, 4, 10, 99, A, B, C}
// add values one by one in set
                set.add("03"); 
                set.add("25");
                set.add("33");
                set.add("21");
                set.add("55");
                set.add("43");
                set.add("78");
                set.add("31");
                set.add("33");
                set.add("75");
                set.add("43");
                set.add("11");
                set.add("36");
                set.add("04"); 
                set.add("10");
                set.add("99");
                set.add("A");
                set.add("B");
// print input set
                System.out.println("Set: " + set);
// call funtion Data_NaN to filter out non-numerical data
                System.out.println("After filtering nonnumerical data- Set: " + Data_NaN(set));
// call funtion Data_Min to calculate min value
                System.out.println("Minimum number from set is= " + Data_Min(Data_NaN(set)));

        }

        static String Data_Min(Set<String> set) {
                // here it will compare the numbers as strings so we will not get the correct
                // so we should convert it as int and find min
                int min = Integer.MAX_VALUE;
                for (String s : set) {
                        if (s.trim().length() != 0) {
                                int i = Integer.parseInt(s);
                                if (i < min)
                                        min = i;
                        }
                }
                return Integer.toString(min);
        }
}

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