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Rollerball
Rollerball

Reputation: 13108

Import a single class in Java

Simple question but even though googled it a lot I could not find the answer.

Is it possible to import a class outside a package?

Let's say I have 2 folders A and B with a .java file in each, is it possible by using the clause import to import the class contained in A? import A.Aclass ? or it's mandatory using package syntax whenever there is the keyword import?

Upvotes: 4

Views: 85199

Answers (5)

carlspring
carlspring

Reputation: 32627

Well, if the class is defined to have a package a; then you need to import the class with the package name. If you have two packages which contain a class with the same name, then in your class which needs to invoke each of them, you will need to use a fully-qualified name. For example:

import a.Foo;
import b.Foo;

public class Bar
{

    public static void main(String[] args)
    {
        a.Foo aFoo = new a.Foo();
        b.Foo bFoo = new b.Foo();
    }
}

Alternatively, if you have two packages with classes of the same name, you can simply skip importing them, but rather -- using them by their fully-qualified names (FQN-s).

If the class does not have a package ...;, then simply import it as:

import Foo;

However, if you have two packages (from different libraries) which contain classes with identical FQN-s, then the first one on the classpath will be picked.

Please, bear in mind that the convention for naming packages is to use lowercase letters and for classes -- the name should start with an upper case letter for each word in the class' name.

Upvotes: 1

Android Killer
Android Killer

Reputation: 18499

Yes, you have to use package syntax.

  • importing all class inside folder A.

    import com.pack.A.*;

  • importing specific class inside folder A.

    import com.pack.ClassName;

Upvotes: 0

1218985
1218985

Reputation: 8022

Yes it is possible to import the class with the import statement. For better understanding let's assume that you have three folders foldera, folderb and folderc where foldera contains a .java file named "ClassA.java", folderb contains another .java file named "ClassB.java" and folderc contains a .java file named "ClassC.java". Now, if you want to uses the member data and operations of "ClassA.java" in "ClassC.java" you can use the import statement as shown below:

import foldera.ClassA

If you want to use the member data & operations of "ClassB.java" in "ClassC.java" it is also possible with the import statement

import folderb.ClassB

As per the java source file declaration rule, if the class is a part of a package, the package statement must be the first line in the source code file, before any import statements that may be present. In this example, the first line of "ClassC.java" source file must be package folderc since it is located in folderc. Similarly, the first line of "ClassA.java" source file must be package foldera, and the first line of "ClassB.java" source file must be package folderb.

Hope now you are clear with the concept! Thank you...

Upvotes: 2

Biswajit
Biswajit

Reputation: 2516

yes it is possible just import the package

syntax

import pck.ClassA or import pck.*

Upvotes: 0

Steve
Steve

Reputation: 1489

Yes it is possible.

If you have the following:

Package: PackA

Class: ClasA

Do:

import PackA.ClassA; //Import the class

OR

import PackA.*; //Import all the classes within the package

Upvotes: 0

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