CurrencyImpl.java

package sef.module7.activity;

import java.util.Calendar;

/**
 * Represents an implementation of the Currency interface. The
 * equality test for this currency implementation requires that the
 * value and the name of the denomination must be true in order to
 * be considered equal.
 * 
 * @author John Doe
 * 
 */
public class CurrencyImpl implements Currency {

	private float value;
	private Denomination denomination;
	private final Calendar createDate = Calendar.getInstance();

	/**
	 * Creates an instance of the of the Currency class with the
	 * specified value and denomination
	 * 
	 * @param value
	 *            the value of the currency
	 * @param denomination
	 *            the denomination of the currency
	 */
	public CurrencyImpl(float value, Denomination denomination) {
		this.value = value;
		this.denomination = new DenominationImpl(
				denomination.getName(), 
				denomination.getDescription(),
		        denomination.getSymbol());
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see sef.module6.activity.Currency#getValue()
	 */
	public float getValue() {
		return this.value;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see sef.module6.activity.Currency#getDenomination()
	 */
	public Denomination getDenomination() {
		Denomination d = new DenominationImpl(
				this.denomination.getName(), 
				this.denomination.getDescription(),
		        this.denomination.getSymbol());
		return d;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see sef.module6.activity.Currency#getCreateDate()
	 */
	public Calendar getCreateDate() {
		Calendar cd=Calendar.getInstance();
		cd.setTimeInMillis(createDate.getTimeInMillis());
		return cd;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#toString()
	 */
	public String toString() {
		return Float.valueOf(this.value) + " "
		        + this.denomination.toString();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#equals(java.lang.Object)
	 */
	public boolean equals(Object o) {
		if (o == this) {
			return true;
		}
		if (o == null) {
			return false;
		}
		Currency c;
		try {
			c = (Currency) o;
		} catch (Exception e) {
			return false;
		}
		if (c.getValue() == this.getValue()
		        && c.getDenomination().getName().equals(
		                denomination.getName())) {
			return true;
		} else {
			return false;
		}
	}

}

DenominationImpl.java

package sef.module7.activity;

import com.sun.org.apache.xalan.internal.xsltc.compiler.sym;

/**
 * An implementation of the Denomination interface. The equality
 * test for between instances of this class considers the name and
 * the symbol
 * 
 * @author John Doe
 * 
 */
public class DenominationImpl implements Denomination {

	private String name;
	private String description;
	private String symbol;

	/**
	 * Creates a new instance with the specified parameters
	 * 
	 * @param name
	 *            the name of the denomination
	 * @param description
	 *            a description
	 * @param symbol
	 */
	public DenominationImpl(String name, String description,
	        String symbol) {
		if ((name == null) || (description == null)
		        || (symbol == null)) {
			throw new IllegalArgumentException("Cannot be null!");
		}
		this.name = name;
		this.description = description;
		this.symbol = symbol;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see sef.module6.activity.Denomination#getDescription()
	 */
	public String getDescription() {
		return this.description;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see sef.module6.activity.Denomination#getName()
	 */
	public String getName() {
		return this.name;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see sef.module6.activity.Denomination#getSymbol()
	 */
	public String getSymbol() {
		return this.symbol;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#toString()
	 */
	@Override
	public String toString() {
		return this.name + " (" + this.symbol + ") "
		        + this.description;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#equals(java.lang.Object)
	 */
	public boolean equals(Object o) {
		if (o == this) {
			return true;
		}
		if (o == null) {
			return false;
		}
		Denomination d;
		try {
			d = (Denomination) o;
		} catch (Exception e) {
			return false;
		}
		if (d.getName().equals(name)
		        && d.getSymbol().equals(symbol)) {
			return true;
		} else {
			return false;
		}
	}

}