Java Cart Address java

package cart;

//Address
//author - Lawrence Truett - FluffyCat.com
//date - August 12, 2003 - San Diego, CA
public class Address {
    private String street1;
    private String street2;
    private String city;
    private State state;
    private Zip zip;
    private Country country;
    private static final Country countryOfUSA = new Country("USA");
    
    public Address() {
        this.setStreet1("");
        this.setStreet2("");
        this.setCity("");
        this.setState(new State());
        this.setZip(new Zip());
        this.setCountry(new Country());
    }
    
    public Address(String street1In, 
                   String street2In, 
                   String cityIn, 
                   State stateIn, 
                   Zip zipIn, 
                   Country countryIn) {
        this.setStreet1(street1In);
        this.setStreet2(street2In);
        this.setCity(cityIn);
        this.setState(stateIn);
        this.setZip(zipIn);
        this.setCountry(countryIn);
    }
    
    //version for all strings in
    public Address(String street1In, 
                   String street2In, 
                   String cityIn,
                   String stateIn, 
                   String zipIn, 
                   String countryIn) {
        this(street1In,
             street2In,
             cityIn,
             new State(stateIn),
             new Zip(zipIn),
             new Country(countryIn));
    }
    
    //USA centric constructor, constructs address with a country of USA
    public Address(String street1In, 
                   String street2In, 
                   String cityIn, 
                   State stateIn, 
                   Zip zipIn) {
        this(street1In,
             street2In,
             cityIn,
             stateIn,
             zipIn,
             countryOfUSA);
    }
    
    //USA centric version for all strings in
    public Address(String street1In, 
                   String street2In, 
                   String cityIn, 
                   String stateIn, 
                   String zipIn) {
        this(street1In,
             street2In,
             cityIn,
             new State(stateIn),
             new Zip(zipIn));
    }
    
    public String getStreet1() {return street1;}
    public void setStreet1(String street1In) {
        this.street1 = street1In;
    }
    
    public String getStreet2() {return street2;}
    public void setStreet2(String street2In) {
        this.street2 = street2In;
    }
    
    public String getCity() {return city;}
    public void setCity(String cityIn) {
        this.city = cityIn;
    }
    
    public State getState() {return state;}
    public void setState(State stateIn) {
        this.state = stateIn;
    }
    
    public Zip getZip() {return zip;}
    public void setZip(Zip zipIn) {
        this.zip = zipIn;
    }
    
    public Country getCountry() {return country;}
    public void setCountry(Country countryIn) {
        this.country = countryIn;
    }
    
    public boolean isValid() {
        if (
        (null != getStreet1()) &&
        (getState().isValid())
        ) {
            return true;
        } else {
            return false;
        }
    }
    
    //method used for data input
    public boolean isValidOrNull() {
        if (
        (getState().isValidOrNull())
        ) {
            return true;
        } else {
            return false;
        }
    }
}