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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.         Integer nameCount = counts.get(name);
  13.         if (nameCount == null) {
  14.             nameCount = 1;
  15.             counts.put(name, nameCount);
  16.         } else {
  17.             counts.put(name, nameCount + 1);
  18.         }
  19.         count++;
  20.     }
  21.  
  22.     public double nameProportion(String name) {
  23.         return counts.get(name) / (double) count;
  24.     }
  25.  
  26.     public static void main(String[] args) {
  27.         Problem namesCount = new Problem();
  28.  
  29.         namesCount.addName("James");
  30.         namesCount.addName("John");
  31.         namesCount.addName("Mary");
  32.         namesCount.addName("Mary");
  33.  
  34.         System.out.println("Fraction of Johns: " + namesCount.nameProportion("John"));
  35.         System.out.println("Fraction of Marys: " + namesCount.nameProportion("Mary"));
  36.     }
  37. }
Success #stdin #stdout 0.12s 36280KB
comments (?)
stdin 
Standard input is empty
stdout 
Fraction of Johns: 0.25
Fraction of Marys: 0.5
https://ideone.com/AHBjAW
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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