Constructor

class Demo{
    double base;
    double height;
    Demo(){
        System.out.println("Inside Constructor:");
        base = 10.5;
        height = 12.5;
    }
    double area(){
        return 0.5*base*height;
    }
}
public class Main{
    public static void main(String args[]){
        Demo dm = new Demo();
        System.out.println("The area of a Triangle is:" + dm.area());
    }
}