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Class Inheritance >
Siva Nookala - 12 Apr 2016
We can use the objects sub-class type, where ever we have super-class type. This program shows how to create a method to compare the entertainments. The Entertainments example discussed in Java Class Inheritance is modified to demonstrate it.

Compare Entertainments Using Methods
class CompareEntertainmentsUsingMethods
{
    public static void main(String s[])
    {
        Movie julai = new Movie();
        julai.name = "Julai";
        julai.director = "Trivikram";
        julai.stuntMaster = "Peter Hein";
        julai.numberOfArtists = 57;
        julai.releaseDate = "15-Aug-2012";
    
        julai.collectionsFirstWeek = 215467.8;
        julai.collectionsRestOfTheDays = 541132.5;
    
        Drama ramayan = new Drama();
        ramayan.name = "Ramayana";
        ramayan.writer = "Valmiki";
        ramayan.stageSetter = "Anjaneya";
        ramayan.numberOfArtists = 200000;
        ramayan.releaseDate = "17-Mar-1659 BC";
    
        ramayan.collectionsFirstWeek = 3282937242.86;
        ramayan.collectionsRestOfTheDays = 93488272349.51;
    
    
        Circus jumbo = new Circus();
        jumbo.name = "Jumbo";
        jumbo.ringMaster = "Antony";
        jumbo.numberOfArtists = 316;
        jumbo.releaseDate = "16-Dec-1997";
    
        jumbo.collectionsFirstWeek = 2123132.21;
        jumbo.collectionsRestOfTheDays = 234936725.09;
    
        compareEntertainments(julai, ramayan, jumbo);
        
    }
    
    public static void compareEntertainments(Entertainment ent1, Entertainment ent2, Entertainment ent3)
    {
    if((ent1.getTotalCollections() > ent2.getTotalCollections()) && (ent1.getTotalCollections() > ent3.getTotalCollections()))
        {
            System.out.println(ent1.name + " has the highest collections.");
        }
        else if (ent2.getTotalCollections() > ent3.getTotalCollections())
        {
            System.out.println(ent2.name + " has the highest collections.");
        }
        else
        {
            System.out.println(ent3.name + " has the highest collections.");
        }
    }

}

class Entertainment
{
    String name;
    int numberOfArtists;
    String releaseDate;
    double collectionsFirstWeek;
    double collectionsRestOfTheDays;

    double getTotalCollections()
    {
        return collectionsFirstWeek + collectionsRestOfTheDays;
    }

    void printEntertainment()
    {
        System.out.println( name + " got the following collections " );
        System.out.println("First Week : " + collectionsFirstWeek);
        System.out.println("Rest Of The Days : " + collectionsRestOfTheDays);
        System.out.println("Total Collections : " + getTotalCollections());
        System.out.println("Total Artists : " + numberOfArtists);
        System.out.println("Release Date : " + releaseDate);
    }

}

class Movie extends Entertainment
{
    String director;
    String stuntMaster;

    void print()
    {
        printEntertainment();
        System.out.println("Director : " + director);
        System.out.println("Stunt Master : " + stuntMaster);
    }
}

class Drama extends Entertainment
{
    String writer;
    String stageSetter;


    void print()
    {
        printEntertainment();
        System.out.println("Writer : " + writer);
        System.out.println("Stage Setter : " + stageSetter);
    }
}

class Circus extends Entertainment
{
    String ringMaster;

    void print()
    {
        printEntertainment();
        System.out.println("Ring Master : " + ringMaster);
    }
}
OUTPUT

Ramayana has the highest collections.

DESCRIPTION

Here we have created a new method compareEntertainments in the class CompareEntertainmentsUsingMethods. This method takes three parameters and all of them are of type Entertainment. So this method can be used not only to compare Movie, Drama and Circus as we are doing here, it can be also used for comparing Movie, Movie and Drama or Circus, Circus and Circus etc.,

THINGS TO TRY
  • Change the order of the parameters passed to the method compareEntertainments, from julai, ramayan and jumbo to jumbo, ramayan, julai. Observe that any object can be passed to the method as long as it is of Entertainment type.
  • In the main method create a new Movie object lifeIsBeautiful and new Drama object devdas and initialize the data. Call the method compareEntertainments to pass the parameters devdas, lifeIsBeautiful and julayi. i.e. we are calling the method with objects of type Drama, Movie and Movie respectively.

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