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  1. import com.google.common.collect.*;
  2. import java.util.*;
  3. import java.time.*;
  4.  
  5. class Transaction {
  6.     double amount;
  7.     String transactionType;
  8.     LocalDate date;
  9.  
  10.     Transaction(double amount, String transactionType, String date) {
  11.         this.amount = amount;
  12.         this.transactionType = transactionType;
  13.         this.date = LocalDate.parse(date);
  14.     }
  15.  
  16.     public double getAmount() {
  17.         return amount;
  18.     }
  19.  
  20.     public String getTransactionType() {
  21.         return transactionType;
  22.     }
  23.  
  24.     public LocalDate getDate() {
  25.         return date;
  26.     }
  27. }
  28.  
  29. public class Main {
  30.     public static void processTransactions(List<Transaction> transactions) {
  31.         // Filter by "Credit" and group by date
  32.         ImmutableListMultimap<LocalDate, Transaction> transactionsByDate = Multimaps.index(
  33.                 FluentIterable.from(transactions)
  34.                         .filter(t -> "Credit".equals(t.getTransactionType())),
  35.                 Transaction::getDate);
  36.  
  37.         // Calculate and print average amount for each date
  38.         for (LocalDate date : transactionsByDate.keySet()) {
  39.             Collection<Transaction> dateTransactions = transactionsByDate.get(date);
  40.             double average = dateTransactions.stream()
  41.                     .mapToDouble(Transaction::getAmount)
  42.                     .average()
  43.                     .orElse(0.0);
  44.             System.out.println(date + " - " + String.format("%.2f$", average));
  45.         }
  46.     }
  47.  
  48.     public static void main(String[] args) {
  49.         List<Transaction> transactions = Arrays.asList(
  50.                 new Transaction(500, "Credit", "2023-05-27"),
  51.                 new Transaction(1500, "Debit", "2023-04-06"),
  52.                 new Transaction(1800, "Credit", "2023-08-06"),
  53.                 new Transaction(250, "Credit", "2023-05-27"),
  54.                 new Transaction(500, "Debit", "2023-05-27")
  55.         );
  56.  
  57.         processTransactions(transactions);
  58.     }
  59. }
  60.  
Success #stdin #stdout 0.25s 60648KB
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2023-05-27 - 375.00$
2023-08-06 - 1800.00$
https://ideone.com/tCsCMZ
language:
Java (HotSpot 12)
created:
36 days ago
visibility:
public

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