File names and Class names in Java code example

Example: File names and Class names in Java

class Triangle {
            int x, y;
            void printArea()
            {
                        System.out.println("Area of triangle is: " + x * y / 2);
            }
}
class Demo {
            public static void main(String args[])
            {
                        Triangle t = new Triangle();
                        t.x = 10;
                        t.y = 13;
                        t.printArea();
            }
}