classPolygon.java

import java.util.*;

public class classPolygon {
 protected int sides;

 classPolygon(int s){
 sides = s;
 }

 public static void main(String[] args) {
 Scanner sc = new Scanner(System.in);

 int s = sc.nextInt();

 PolygonSquare sq = new PolygonSquare();
 PolygonTriangle tr = new PolygonTriangle();
 classPolygon p = new classPolygon(s);

 sq.draw();
 tr.draw();
 p.draw();
 sc.close();
 }

 public void draw(){
 if(sides == 4){
 System.out.println("Square has 4 sides");
 }else if(sides == 3){
 System.out.println("Triangle has 3 sides");
 }else{
 System.out.println("Polygon of " + sides + " sides");
 }
 }
}

class PolygonSquare extends classPolygon{
 PolygonSquare(){
 super(4);
 }
}

class PolygonTriangle extends classPolygon{
 PolygonTriangle(){
 super(3);
 }
}