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public class FacebookPublisher implements SocialPublisher {
    @Override
    public String share() {
        return "Facebook";
    }
}

public class Millenials extends User {
    public Millenials(String name) {
        super(name);
        this.socialPublisher = new FacebookPublisher();
    }
}

public interface SocialPublisher {
    String share();
}

public class TwitterPublisher implements SocialPublisher{
    @Override
    public String share() {
        return "Twitter";
    }
}

public class User {
    final private String name;
    protected SocialPublisher socialPublisher;

    public User(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public String sharePost() {
        return socialPublisher.share();
    }

    public void setSocialPublisher(SocialPublisher socialPublisher) {
        this.socialPublisher = socialPublisher;
    }
}

public class YGeneration extends User {
    public YGeneration(String name) {
        super(name);
        this.socialPublisher = new TwitterPublisher();
    }
}

public class ZGeneration extends User {
    public ZGeneration(String name) {
        super(name);
        this.socialPublisher = new SnapchatPublisher();
    }
}

public class SnapchatPublisher implements SocialPublisher {
    @Override
    public String share() {
        return "SnapChat";
    }
}

//JUnit test
public class UserTestSuite {
    @Test
    public void testDefaultSharingStrategies() {
        //Given
        User user1 = new YGeneration("User1");
        User user2 = new Millenials("User2");
        User user3 = new ZGeneration("User3");

        //When
        String user1Should = user1.sharePost();
        System.out.println("User1 should: " + user1Should);
        String user2Should = user2.sharePost();
        System.out.println("User2 should: " + user2Should);
        String user3Should = user3.sharePost();
        System.out.println("User3 should: " + user3Should);

        //Then
        Assert.assertEquals("Twitter", user1Should);
        Assert.assertEquals("Facebook", user2Should);
        Assert.assertEquals("SnapChat", user3Should);
    }
    @Test
    public void testIndividualSharingStrategy() {
        //Given
        User user1 = new YGeneration("User1");

        //When
        String user1Should = user1.sharePost();
        System.out.println("User1 should: " + user1Should);
        user1.setSocialPublisher(new FacebookPublisher());
        user1Should = user1.sharePost();
        System.out.println("User1 now should: " + user1Should);

        //Then
        Assert.assertEquals("Facebook", user1Should);
    }
}