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Copy pathAddressMain1.java
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35 lines (26 loc) · 806 Bytes
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package optional;
import optional.model.Address;
import optional.model.User;
public class AddressMain1 {
public static void main(String[] args) {
User user1 = new User("user1", null);
User user2 = new User("user2", new Address("hello street"));
printStreet(user1);
printStreet(user2);
}
private static void printStreet(User user) {
String userStreet = getUserStreet(user);
if(userStreet != null) System.out.println(userStreet);
else System.out.println("unknown");
}
static String getUserStreet(User user){
if(user == null) {
return null;
}
Address address = user.getAddress();
if(address == null){
return null;
}
return address.getStreet();
}
}