Java - Method Concept

 class test2
  {
   double b,h,a;
   void area()   // area is method name
    {
      a = (0.5*b*h);
      System.out.println("Area of Triangle is : "+a);
    }
    public static void main(String arg[])
    {
       test2 t1 = new test2();
       test2 t2 = new test2();
       test2 t3 = new test2();

         System.out.println("\n");
         t1.b = 10;   t1.h = 20;
         System.out.println("Triangle-1");
         t1.area();

         System.out.println("\n");
         t2.b = 20;   t2.h = 500;
         System.out.println("Triangle-2");
         t2.area();

         System.out.println("\n");
         t3.b = 50;   t3.h = 100;
         System.out.println("Triangle-3");
         t3.area();
    }
}