CoinPurse.java

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

public class CoinPurse {

    private double amount;
    public void addTo(Coin c){
	amount = amount + c.getValue();
    }
    public void removeFrom(Coin c){
	amount = amount - c.getValue(); 
    }
    public double getAmount(){
	return amount;
    }
}