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  1. import com.google.common.collect.*;
  2. import java.util.*;
  3.  
  4. public class Main {
  5.  
  6.     public static class Transaction {
  7.         public final double amount;
  8.         public final String transactionType;
  9.         public final String date;
  10.  
  11.         public Transaction(double amount, String transactionType, String date) {
  12.             this.amount = amount;
  13.             this.transactionType = transactionType;
  14.             this.date = date;
  15.         }
  16.     }
  17.  
  18.     public static void processTransactions(List<Transaction> transactions) {
  19.         // Filter by Credit Transactions
  20.         ImmutableList<Transaction> creditTransactions = FluentIterable.from(transactions)
  21.                 .filter(t -> t.transactionType.equals("Credit"))
  22.                 .toList();
  23.  
  24.         // Group by Date
  25.         ImmutableListMultimap<String, Transaction> transactionsByDate = Multimaps.index(creditTransactions, t -> t.date);
  26.  
  27.         // Calculate and print the average for each date
  28.         for (String date : transactionsByDate.keySet()) {
  29.             Collection<Transaction> dateTransactions = transactionsByDate.get(date);
  30.             double averageAmount = dateTransactions.stream()
  31.                     .mapToDouble(t -> t.amount)
  32.                     .average()
  33.                     .orElse(0.0);
  34.             System.out.printf("%s - %.2f$\n", date, averageAmount);
  35.         }
  36.     }
  37.  
  38.     public static void main(String[] args) {
  39.         List<Transaction> transactions = Arrays.asList(
  40.             new Transaction(500, "Credit", "2023-05-27"),
  41.             new Transaction(1500, "Debit", "2023-04-06"),
  42.             new Transaction(1800, "Credit", "2023-08-06"),
  43.             new Transaction(250, "Credit", "2023-05-27"),
  44.             new Transaction(500, "Debit", "2023-05-27")
  45.         );
  46.  
  47.         processTransactions(transactions);
  48.     }
  49. }
  50.  
Success #stdin #stdout 0.19s 58060KB
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2023-05-27 - 375.00$
2023-08-06 - 1800.00$
https://ideone.com/D7yr9c
language:
Java (HotSpot 12)
created:
36 days ago
visibility:
public

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