import java.util.*; 
import java.io.*; 
import java.math.*;

public class CheckbookBalance extends Checkbook {

    void balanceCheckbook(Transactions trans) throws Exception {

        // Get the current balance of the checkbook 
        BigDecimal balance = this.getBalance();

        // Get the list of transactions from the Trans object 
        List tEntries = trans.getEntries();

        // Initialize a BigDecimal to track the amount of each transaction BigDecimal amt;

        // Iterate through the transaction list, recalculate the balance, 
        // and add the transaction to the checkbook 
        for (ListIterator i = tEntries.listIterator(); i.hasNext(); ) { 
            Entry entry = (Entry)i.next(); 
            amt = entry.getAmount(); 
            if (entry instanceof Deposit){ 
                balance = balance.add(amt); 
            } 
            else { 
               balance = balance.subtract(amt); 
            } 
            this.getTransactions().getEntries().add(entry); 
        }

        // Check if the balance is negative. 
        if(balance.compareTo(new BigDecimal(0.00)) == -1){ 
            System.out.println("You are overdrawn."); 
        }

        // Output the new balance 
        System.out.println("Your balance is: "+balance);
        
        // Update the balance in the checkbook. 
        this.setBalance(balance);
    } 
}