Exercice 5, Partie 2.

src/exercice5part2.java

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+import partie5.Cercle;
+import partie5.Carre;
+import partie5.Forme;
+
+public class exercice5part2 {
+    public static void main(String[] args) {
+        Cercle cercle = new Cercle(5);
+        Carre carre = new Carre(10);
+
+        printForme(cercle);
+        printForme(carre);
+    }
+
+    public static void printForme(Forme f)
+    {
+        System.out.println("Cercle\tPerimetre: "+f.perimetre()+"\tSurface/Aire: "+f.surface()+"\tEtalement: "+f.etalement());
+    }
+}

src/partie5/Carre.java

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+package partie5;
+
+public class Carre extends Forme {
+    double cote;
+
+    public Carre(double c)
+    {
+        this.cote = c;
+    }
+
+    public double perimetre() {
+        return this.cote*4;
+    }
+
+    public double surface() {
+        return this.cote*this.cote;
+    }
+}

src/partie5/Cercle.java

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+package partie5;
+
+public class Cercle extends Forme {
+    double rayon;
+
+    public Cercle(double r)
+    {
+        this.rayon = r;
+    }
+
+    public double perimetre()
+    {
+        return rayon*2*Math.PI;
+    }
+
+    public double surface()
+    {
+        return rayon*rayon*Math.PI;
+    }
+}

src/partie5/Forme.java

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+package partie5;
+
+public abstract class Forme {
+    public abstract double perimetre();
+    public abstract double surface();
+    public double etalement() {
+        double peri = perimetre();
+        return 16 * surface() / (peri* peri);
+    }
+}