Importing two classes with same name How to handle

Question

Say I ve a code like   import java util Date  import my own Date   class Test     public static void main String    args           I want to choose my own Date here  How                I want to choose util Date here  How            Should I be full qualified class names  Can I get rid of the import statements  Is such a scenario common in real world programming

User · Answer

Yes  when you import classes with the same simple names  you must refer to them by their fully qualified class names   I would leave the import statements in  as it gives other developers a sense of what is in the file when they are working with it   java util Data date1   new java util Date    my own Date date2   new my own Date

User · Answer

When you call classes with the same names  you must explicitly specify the package from which the class is called   You can to do like this   import first Foo   public class Main       public static void main String   args            System out println new Foo             System out println new second Foo                package first   public class Foo       public Foo                 Override     public String toString             return  Foo first class               package second   public class Foo       public Foo                 Override     public String toString             return  Foo second class              Output   Foo first class  Foo second class

User · Answer

You can import one of them using import  For all other similar class   you need to specify Fully qualified class names  Otherwise you will get compilation error   Eg   import java util Date   class Test     public static void main String    args           your own date     my own Date myOwndate           util Date     Date utilDate

User · Answer

If you have your own date class you should distinguish it form the built in Date class  i e  why did you create your own   Something like ImmutableDate or BetterDate or NanoDate  even MyDate would indicate why you have your own date class   In this case  they will have a unique name

User · Answer

I just had the same problem  what I did  I arranged the library order in sequence  for example there were java lang NullPointerException and javacard lang NullPointerException  I made the first one as default library and if you needed to use the other you can explicitly specify the full qualified class name

User · Answer

You can omit the import statements and refer to them using the entire path  Eg   java util Date javaDate   new java util Date   my own Date myDate   new my own Date      But I would say that using two classes with the same name and a similiar function is usually not the best idea unless you can make it really clear which is which

User · Answer

use the fully qualified name instead of importing the class    e g     import java util Date    delete this   import my own Date   class Test      public static void main String    args             I want to choose my own Date here  How        my own Date myDate   new my own Date              I want to choose util Date here  How         java util Date javaDate   new java util Date

User · Answer

This scenario is not so common in real-world programming  but not so strange too  It happens sometimes that two classes in different packages have same name and we need both of them   It is not mandatory that if two classes have same name  then both will contain same functionalities and we should pick only one of them   If we need both  then there is no harm in using that  And it s not a bad programming idea too   But we should use fully qualified names of the classes  that have same name  in order to make it clear which class we are referring too

User · Answer

I hit this issue when  for example  mapping one class to another  such as when switching to a new set of classes to represent person data    At that point  you need both classes because that is the whole point of the code--to map one to the other   And you can t rename the classes in either place  again  the job is to map  not to go change what someone else did    Fully qualified is one way   It appears you can t actually include both import statements  because Java gets worried about which  Person  is meant  for example

User · Answer

If you really want or need to use the same class name from two different packages  you have two options  1-pick one to use in the import and use the other s fully qualified class name   import my own Date   class Test        public static void main String   args               I want to choose my own Date here  How            Answer          Date ownDate   new Date                I want to choose util Date here  How             Answer          java util Date utilDate   new java util Date                  2-always use the fully qualified class name     no Date import class Test     public static void main String   args           I want to choose my own Date here  How        Answer       my own Date ownDate   new my own Date           I want to choose util Date here  How         Answer       java util Date utilDate   new java util Date

User · Answer

Another way to do it is subclass it   package my own   public class FQNDate extends Date        And then import  my own FQNDate in packages that have java util Date

[java] Importing two classes with same name. How to handle?

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