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abstractClass.java

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// 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());

}