* Default constructor. Sets up the "database"
*/
public SampleDAO() {
getDatabase().put("00001",
new Sample("00001", "Wuthering Heights", SampleType.BOOK));
getDatabase().put("00002",
new Sample("00002", "Silas Marner", SampleType.BOOK));
getDatabase().put("00003",
new Sample("00003", "The Life of Pi", SampleType.BOOK));
getDatabase().put("00004",
new Sample("00004", "Gladiator", SampleType.DVD));
getDatabase().put("00005",
new Sample("00005", "Oliver Twist", SampleType.BOOK));
}