figuri_colectii

package figuri;

import java.util.ArrayList;

abstract class Figuri {
    protected String culoare;
    public Figuri(String culoare){
        this.culoare = culoare;
    }
    public abstract double calculPerimetru();
}
class Cerc extends Figuri{
    private double raza;
    public Cerc(double raza, String culoare){
        super(culoare);
        this.raza = raza;
    }
    public double calculPerimetru(){
        return 2 * 3.14 * this.raza;
    }
    public void modificaRaza(double razaNoua){

         this.raza = razaNoua;
         Observator.anuntaModificare();

    }
    public String toString(){
        String s = "Cerc" + " " + this.culoare;
        s = s + " " + this.calculPerimetru();
        return s;
    }
}
class Patrat extends Figuri{
    private double latura;
    public Patrat(double latura, String culoare){
        super(culoare);
        this.latura = latura;
    }
    public  double calculPerimetru(){
        return 2 * latura;
    }
    public void modificaLatura(double laturaNoua){
         this.latura = laturaNoua;
         Observator.anuntaModificare();
    }

    public String toString(){
        String s = "Patrat" + " " + this.culoare;
        s = s + " " + this.calculPerimetru();
        return s;
    }
}
class Triunghi extends Figuri{
    private double l1;
    private double l2;
    private double l3;
    public Triunghi(double l1, double l2, double l3, String culoare){
        super(culoare);
        this.l1 = l1;
        this.l2 = l2;
        this.l3 = l3;
    }
    public  double calculPerimetru(){
        return (l1+ l2 + l3);
    }
    public  void modificaLaturile(double l1Nou, double l2Nou, double l3Nou){
        this.l1 = l1Nou;
        this.l2 = l2Nou;
        this.l3 = l3Nou;
        Observator.anuntaModificare();
    }
    public String toString(){
        String s = "Triunghi" + " " +  this.culoare;
        s = s + " " +  this.calculPerimetru();
        return s;
    }
}
class Observator {
    private static ArrayList<Figuri> figuri = new ArrayList<Figuri>();

    public static void adaugaFigura(Figuri f){
        figuri.add(f);
    }

    public   String toString(){
        return figuri.toString();

    }
    public static void anuntaModificare(){
        System.out.println("S-a modificat");
        System.out.println(figuri.toString());
    }
}

class Main{
    public static void main(String[] args){
         Patrat p = new Patrat(4, "rosu");
         Cerc c = new Cerc(2, "verde");
         Triunghi t = new Triunghi(3,4,5,"albastru");
         Observator o = new Observator();
         o.adaugaFigura(p);
         o.adaugaFigura(c);
         o.adaugaFigura(t);
         p.modificaLatura(8);
    }
}