In this tutorial, we are going to write a Java program using an abstract class in Java Programming with practical program code and step-by-step full complete explanation.
Java program using abstract class.
public abstract class shape
{
public abstract void calculatearea();
}
public class circle extends shape
{
privateintx,y;
privateint radius;
public circle()
{
x=15;
y=15;
radius=10;
}
public void calculatearea ()
{
double area=3.14*(radius*radius);
System.out.println("area="+area);
}
}
class test1
{
public static void main(String arr[])
{
shape s =null;
s=new circle();
s.calculatearea();
}
}
Output
area=314.0