Java: 3 Easy programs for Class and Objects basics in Java.


Programs:

// 1.   Create a class Vehicle.
//      a.  The class should have two fields:
//          i.  no_of_seats and no_of_wheels.
//      b.  Create two objects
//          i.  Motorcycle and Car for this class.
//      c.  Your output should show the descriptions for Car and Motorcycle

package A6;

class Vehicle {
    // Initialize attributes:
    int no_of_seats;
    int no_of_wheels;

    // Two-argument constructor:
    Vehicle(int seats, int wheels) {
        no_of_seats  = seats;
        no_of_wheels = wheels;

    }

    // Displays values of attributes:
    String display() {
        return "no_of_seats = "+no_of_seats+", no_of_wheels = "+no_of_wheels+".";
    }

    public static void main(String args[])
    {
        // Create two objects: Motorcycle and Car.
        Vehicle motorcycle = new Vehicle(1,2);
        Vehicle car = new Vehicle(5,4);

        // Output descriptions of the two objects:
        System.out.println("Object motorycle: "+ motorcycle.display());
        System.out.println("Object car: "+ car.display());
    }
}


// 2.   Create a class with a method. The method has to decide whether a given year is a leap year or not.
//      a.  Note: A year is considered a leap year if:
//          i.      It has an extra day i.e. 366 instead of 365.
//          ii.     It occurs every 4 years e.g. 2008, 2012 are leap years.
//          iii.    For every 100 years, a special rule applies -
//                  1900 is not a leap year but 2000 is a leap year.
//                  In those cases, we need to check whether it is divisible by 400 or not.

package A6;

class LeapYear {
    static String checkifLeapYear(int y)
    {
        return y % 4 == 0 && y % 100 != 0 || y % 4 == 0 && y % 100 == 0 && y % 400 == 0 ? "leap" : "non-leap";
    }

    public static void main(String args[])
    {
        int[] years = {1900,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010};
       
        for (int year: years)
            System.out.println("The year "+year+" is a "+checkifLeapYear(year)+" year.");
    }
}


// 3.   Create a class with a method to calculate the factorial of a number.
package A6;

class Q3 {
    static int calculateFactorial(int num){
        int factorial = 1;

        for (int i = 1; i <= num; ++i)
            factorial *= i;

        return factorial;
    }

    public static void main(String args[])
    {
        int[] numbers = {4,5,10,15};
       
        for (int n : numbers)
            System.out.println("Factorial of "+n+" is "+calculateFactorial(n));
    }
}


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