initial

src/main/java/bank/Transaction.java

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+package bank;
+
+import bank.exceptions.TransactionAttributeException;
+import com.google.gson.*;
+
+public abstract class Transaction implements CalculateBill{
+    /**
+     * protected vars, which must be available throughout the whole package
+     */
+    protected String date;
+    protected double amount;
+    protected String description;
+
+    /**
+     * Sets the amount of the payment.
+     *
+     * @param newAmount The new amount for the payment.
+     */
+    public void setAmount(double newAmount) throws TransactionAttributeException {
+        this.amount = newAmount;
+    }
+
+    /**
+     * Gets the amount of the payment.
+     *
+     * @return The amount of the payment.
+     */
+    public double getAmount() {
+        return amount;
+    }
+
+    /**
+     * Sets the description of the payment.
+     *
+     * @param newDescription The new description for the payment.
+     */
+    public void setDescription(String newDescription) {
+        this.description = newDescription;
+    }
+
+    /**
+     * Gets the description of the payment.
+     *
+     * @return The description of the payment.
+     */
+    public String getDescription() {
+        return description;
+    }
+
+    /**
+     * Sets the date of the payment.
+     *
+     * @param newDate The new date for the payment.
+     */
+    public void setDate(String newDate) {
+        this.date = newDate;
+    }
+
+    /**
+     * Gets the date of the payment.
+     *
+     * @return The date of the payment.
+     */
+    public String getDate() {
+        return date;
+    }
+
+    /**
+     * Constructor for creating a transaction with date, amount, and description
+     *
+     * @param newDate        The date of the transfer.
+     * @param newAmount      The amount of the transfer.
+     * @param newDescription The description of the transfer.
+     */
+    public Transaction(String newDate, double newAmount, String newDescription) throws TransactionAttributeException {
+        this.setAmount(newAmount);
+        this.setDescription(newDescription);
+        this.setDate(newDate);
+    }
+
+    /**
+     * Prints the transaction details to the console.
+     * Amount is printed in the extended class, because of
+     * different conditions to be checked
+     */
+    @Override
+    public String toString() {
+        return ("\n       Date: " + this.getDate() +
+                "\nDescription: " + this.getDescription() +
+                "\n     Amount: " + this.calculate()
+        );
+    }
+
+    /**
+     * Compares obj with current transaction
+     *
+     * @param obj The object to compare with
+     * @return Result of the comparison
+     */
+    @Override
+    public boolean equals(Object obj) {
+        if (obj instanceof Transaction) {
+            Transaction other = (Transaction) obj;
+            return (
+                this.getDate().equals(other.getDate()) &&
+                this.getAmount() == other.getAmount() &&
+                this.getDescription().equals(other.getDescription())
+            );
+        }
+        return false;
+    }
+
+
+}