update

Checkbook/.idea/workspace.xml

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Checkbook/src/main/java/Checkbook.java

+import java.time.LocalDate;
 import java.util.*;
 
 public class Checkbook<T extends Transaction> implements Collection<T> {
         transactions.clear();
     }
 
+    public double checkbookValue(){
+        double sum = 0.0;
+        for (Transaction t : transactions) {
+            if (t.getType().equals(TransactionType.CREDIT)) {
+                sum += t.getAmount();
+            } else {
+                sum -= t.getAmount();
+            }
+        }
+        return sum;
+    }
+
+    public Transaction[] getTransactionsForDate(LocalDate aDate) {
+        ArrayList<Transaction> dateList = new ArrayList<>();
+        for (Transaction t : transactions) {
+            if (t.getDate().equals(aDate)) {
+                dateList.add(t);
+            }
+        }
+        return dateList.toArray(new Transaction[0]);
+    }
+
+    Transaction[] getAllTransactionsForPayee(Payee payee) {
+        ArrayList<Transaction> payeeList = new ArrayList<>();
+        for (Transaction t : transactions) {
+            if (t.getPayee().equals(payee)) {
+                payeeList.add(t);
+            }
+        }
+        return payeeList.toArray(new Transaction[0]);
+    }
+
+    Transaction[] getAllDebitTransactions() {
+        ArrayList<Transaction> debitList = new ArrayList<>();
+        for (Transaction t : transactions) {
+            if (t.getType().equals(TransactionType.DEBIT)) {
+                debitList.add(t);
+            }
+        }
+        return debitList.toArray(new Transaction[0]);
+    }
+
+    Transaction[] getAllCreditTransactions() {
+        ArrayList<Transaction> creditList = new ArrayList<>();
+        for (Transaction t : transactions) {
+            if (t.getType().equals(TransactionType.CREDIT)) {
+                creditList.add(t);
+            }
+        }
+        return creditList.toArray(new Transaction[0]);
+    }
+
     //blind us with your Java eloquence....
 
 }