// Java Program to Illustrate Factory Pattern

// Dependent class

public class ExpenseTracker {

    // Getting instance of ExpenseCalculator class

    // using Factory class method

    private ExpenseCalculator expenseCal

        = ExpenseCalculatorFactory.getInstance();

    // Method

    public void add(Transaction transaction)

    {

        // Returns the expense amount

        // of ExpenseCalculator class

        int expense

            = expenseCal.getTransactionAmount(transaction);

        add(expense);

    }

}