java 标题 编写一个代表地址的Address类，地址信息由国家，省份，城市，街道，邮编组成，并且可以返回完整的地址信息！并用测试类 进行测试

public final class Address {    public final String country;    public final String province;    public final String city;    public final String street;    public final String postcode;    public Address(String country,String province,String city,String street,String postcode){        this.country = country;        this.province = province;        this.city = city;        this.street = street;        this.postcode = postcode;    }    @Override String toString(){        return String.format("Address[country:%s, province:%s, city:%s, street:%s, postcode:%s]",country,province,city,street,postcode);    }}