public class Address {	private String _street = "Holulu";	private String _city = "LA";		//accessor	public void setStreet(String f) {		_street = f;	}		public String getStreet() {		return _street;	}		public void setCity(String l) {		_city = l;	}		public String getCity() {		return _city;	}}public class Person {	private String _firstName = "Hello";	private String _lastName = "ZK";	private String _email = "hellozk@potix.com";	private Address _address;		//accessor	public void setFirstName(String f) {		_firstName = f;	}		public String getFirstName() {		return _firstName;	}		public void setLastName(String l) {		_lastName = l;	}		public String getLastName() {		return _lastName;	}		public String getFullName() {		return _firstName + " " + _lastName;	}		public void setEmail(String e) {		_email = e;	}	public String getEmail() {		return _email;	}		public void setAddress(Address adr) {		_address = adr;	}		public Address getAddress() {		return _address;	}}