Demo.java

class Maths
{
    public int iNo1;           //characteristcs
    public int iNo2;           //characteristcs

    public Maths()            // Default constructor
    {
        System.out.println("Inside default constructor");
        iNo1 = 0;
        iNo2 = 0;
    }
    public Maths(int a, int b)  // Parametrised constructor
    {
        System.out.println("Inside paramtrised constructor");
        iNo1 = a;
        iNo2 = b;
    }
    public int Addition()  // Behaviour
    {
        int iAns = 0;
        iAns = iNo1 + iNo2;
        return iAns;
    }
    public int Substraction()  // Behaviour
    {
        int iAns = 0;
        iAns = iNo1 - iNo2;
        return iAns;
    }
} //End of Maths class

class Demo
{
    public static void main(String arr[])
    {
        System.out.println("Inside main function");

        Maths mobj1 = new Maths();
        Maths mobj2 = new Maths(10, 11);
        
        int iRet = 0;
        iRet = mobj1.Addition();
        System.out.println("Addition is :"+iRet);
        
        iRet = mobj2.Addition();
        System.out.println("Addition is :"+iRet);

    }
}