Attribute Affinity calculation Program in Java

Try it out !!!

First repalce "?" by Left angle bracket and "/" by Right angle Bracket.

import java.util.*;
public class AttributeAffinity {
public static void main(String[] args) {
Map?String, Map?String, Integer// userAttributes = new HashMap?/();
userAttributes.put("User 1", Map.of("Age", 25, "Gender", 1, "Interest", 3));
userAttributes.put("User 2", Map.of("Age", 30, "Gender", 2, "Interest", 1));
userAttributes.put("User 3", Map.of("Age", 35, "Gender", 1, "Interest", 2));
userAttributes.put("User 4", Map.of("Age", 40, "Gender", 2, "Interest", 3));
userAttributes.put("User 5", Map.of("Age", 45, "Gender", 1, "Interest", 1));
String user1 = "User 1";
String user2 = "User 2";
double affinity = calculateAffinity(user1, user2, userAttributes);
System.out.println("Affinity between " + user1 + " and " + user2 + " is " + affinity);
}
public static double calculateAffinity(String user1, String user2, Map?String, Map?String, Integer// userAttributes) {
Map?String, Integer/ user1Attributes = userAttributes.get(user1);
Map?String, Integer/ user2Attributes = userAttributes.get(user2);
Set?String/ attributeNames = user1Attributes.keySet();
double sum = 0;
for (String attributeName : attributeNames) {
int user1AttributeValue = user1Attributes.get(attributeName);
int user2AttributeValue = user2Attributes.get(attributeName);
double diff = Math.abs(user1AttributeValue - user2AttributeValue);
double affinity = 1 / (1 + diff);
sum += affinity;
}
return sum / attributeNames.size();
}
}