📦 NEW: add rechercher() and additionner() in ABCDEF.java

Signed-off-by: Jonas Sulzer <jonas@violoncello.ch>

src/Ex_04/ABCDEF.java → src/Ex_04/p2/ABCDEF.java

-package Ex_04;
+package Ex_04.p2;
 
 class A {
     public A() { }
@@ -79,10 +79,22 @@ class ABCDEF {
     }
 
     private static void rechercher(A[] as) {
-        // A remplir
+        int count = 0;
+        for (A el: as) {
+            if (el instanceof B) {
+                count += 1;
+            }
+        }
+        System.out.println("Il y a " + count + " instances de la classe B");
     }
 
     private static void additionner(A[] as) {
-        // A remplir
+        int sum = 0;
+        for (A el: as) {
+            if (el instanceof D) {
+                sum += ((D) el).d;
+            }
+        }
+        System.out.println("Somme des variables d : " + sum);
     }
 }
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