Write a java program to create an abstract class named shape that contains an empty method named numberofsides().Provide three classes named Trapezoid, Triangle and Hexagon such that each one of the extends the class shape. Each one of the classes contains only the method numberofsides() that shows the number of sides in the given geometrical figure .

import javax.swing.*;
abstract class Shape
{
public abstract void numberOfSides();
}
class Trapezoid extends Shape
{
public void numberOfSides()
{
JOptionPane.showMessageDialog(null,"TRAPEZOID -- Number of sides in trapezoid is 4 (Of which two
are parallel and with no angles)");
}
}
class Triangle extends Shape
{
public void numberOfSides()
{
JOptionPane.showMessageDialog(null,"TRIANGLE -- Number of sides in Triangle is 3 ");
}
}
class Hexagon extends Shape
{
public void numberOfSides()
{
JOptionPane.showMessageDialog(null,"HEXAGON -- Number of sides in Hexagon is 6 ");
}
}
classShapeDemo
{
public static void main(String[] args)
{
JOptionPane.showMessageDialog(null,"Some of the Geometrical figures are as follows " );
Trapezoid t=new Trapezoid();
Triangle tg=new Triangle();
Hexagon h=new Hexagon();
t.numberOfSides();
tg.numberOfSides();
h.numberOfSides();
}
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