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  1. import java.util.HashMap;
  2.  
  3. class Problem {
  4.     private int count;
  5.     private final HashMap<String, Integer> counts;
  6.  
  7.     public Problem() {
  8.         this.counts = new HashMap<>();
  9.     }
  10.  
  11.     public void addName(String name) {
  12. 	    counts.put(name, counts.getOrDefault(name, 0) + 1);
  13. 	    count++;
  14. 	}
  15.  
  16.     public double nameProportion(String name) {
  17.         return counts.get(name) / (double) count;
  18.     }
  19.  
  20.     public static void main(String[] args) {
  21.         Problem namesCount = new Problem();
  22.  
  23.         namesCount.addName("James");
  24.         namesCount.addName("John");
  25.         namesCount.addName("Mary");
  26.         namesCount.addName("Mary");
  27.  
  28.         System.out.println("Fraction of Johns: " + namesCount.nameProportion("John"));
  29.         System.out.println("Fraction of Marys: " + namesCount.nameProportion("Mary"));
  30.     }
  31. }
Success #stdin #stdout 0.1s 36412KB
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Standard input is empty
stdout
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Fraction of Johns: 0.25
Fraction of Marys: 0.5
https://ideone.com/9cjq1m
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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