Question

Suppose you have a set of data as shown below:

{3, 25, 33, 21, 55, 43, 78, 31, 33, 75, 43, 11, 36, 4, 10, 99, A, B, C}

Write a Java class called "DataAnalysis" that has the following methods:

• Data_NaN: this method filters nonnumerical data, for example, A, B, and C will be filtered out by this method;
• Data_min: this method computes and returns the minimum of the numerical data;

Answer 1

Program:
  
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:

Set: [78, A, B, C, 55, 04, 36, 33, 25, 11, 03, 21, 10, 43, 31, 99, 75]
After filtering nonnumerical data- Set: [, 78, 55, 04, 36, 33, 25, 11, 03, 21, 10, 43, 31, 99, 75]
Minimum number from set is= 03