// Program to demonstrate abstract classes in Java -
package abstractClass;
// No function definition can be added
// Objects of abstract class cannot be created,but object references can be created
// Syntax: abstract type method-name(parameter-list);
// abstract class class-name {}
// No abstract constructors
// Abstract class must be a subclass
abstract class area {
double dim1, dim2;
public area(double x, double y) {
dim1 = x;
dim2 = y;
}
abstract double area1();
}
class rectangle extends area {
rectangle(double a, double b) {
super(a, b);
}
double area1() {
System.out.println("Area of rectangle = ");
return dim1*dim2;
}
}
class triangle extends area {
triangle(double a, double b) {
super(a, b);
}
double area1() {
System.out.println("Area of triangle = ");
return (0.5*dim1*dim2);
}
}
public class AbstractClass {
public static void main(String[] args) {
// TODO Auto-generated method stub
rectangle r = new rectangle(10, 15);
triangle t = new triangle(2, 5);
System.out.println(r.area1());
System.out.println(t.area1());
}
}