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  1. import com.google.common.collect.ArrayListMultimap;
  2. import com.google.common.collect.Multimap;
  3. import java.time.LocalDate;
  4. import java.time.format.DateTimeFormatter;
  5. import java.util.Arrays;
  6. import java.util.List;
  7. import java.util.Map;
  8.  
  9. public class Main {
  10.  
  11.     static class Transaction {
  12.         int amount;
  13.         String transactionType;
  14.         LocalDate date;
  15.  
  16.         Transaction(int amount, String transactionType, String dateString) {
  17.             this.amount = amount;
  18.             this.transactionType = transactionType;
  19.             this.date = LocalDate.parse(dateString, DateTimeFormatter.ISO_LOCAL_DATE);
  20.         }
  21.  
  22.         public int getAmount() {
  23.             return amount;
  24.         }
  25.  
  26.         public String getTransactionType() {
  27.             return transactionType;
  28.         }
  29.  
  30.         public LocalDate getDate() {
  31.             return date;
  32.         }
  33.     }
  34.  
  35.     public static void main(String[] args) {
  36.         List<Transaction> transactions = Arrays.asList(
  37.                 new Transaction(500, "Credit", "2023-05-27"),
  38.                 new Transaction(1500, "Debit", "2023-04-06"),
  39.                 new Transaction(1800, "Credit", "2023-08-06"),
  40.                 new Transaction(250, "Credit", "2023-05-08"),
  41.                 new Transaction(500, "Debit", "2023-05-05")
  42.         );
  43.  
  44.         processTransactions(transactions);
  45.     }
  46.  
  47.     private static void processTransactions(List<Transaction> transactions) {
  48.         Multimap<String, Transaction> transactionsByMonth = ArrayListMultimap.create();
  49.  
  50.         transactions.stream()
  51.                 .filter(t -> "Credit".equals(t.getTransactionType()))
  52.                 .forEach(t -> transactionsByMonth.put(t.getDate().getMonth().toString(), t));
  53.  
  54.         for (String month : transactionsByMonth.keySet()) {
  55.             double average = transactionsByMonth.get(month).stream()
  56.                     .mapToInt(Transaction::getAmount)
  57.                     .average()
  58.                     .orElse(0);
  59.  
  60.             System.out.println("\"" + month + "\", " + (int) average);
  61.         }
  62.     }
  63. }
  64.  
Success #stdin #stdout 0.2s 59976KB
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"MAY", 375
"AUGUST", 1800
https://ideone.com/9KE58b
language:
Java (HotSpot 12)
created:
36 days ago
visibility:
public

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