added ex P

src/exercises/ex_p/Drum.java

@@ -0,0 +1,13 @@
+package exercises.ex_p;
+
+public class Drum {
+    private final String name;
+
+    public Drum(String name) {
+        this.name = name;
+    }
+
+    public void play() {
+        System.out.println("Playing " + name);
+    }
+}

src/exercises/ex_p/Partition.java

@@ -0,0 +1,38 @@
+package exercises.ex_p;
+
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+public class Partition {
+    public static void main(String[] args) {
+        Drum bassDrum = new Drum("Bass Drum");
+        Drum floortom = new Drum("Floor Tom");
+        Drum snareDrum = new Drum("Snare Drum");
+        Drum rackTom = new Drum("Rack Tom");
+        Drum hiHat = new Drum("Hi-Hat");
+        Drum crashCymbal = new Drum("Crash Cymbal");
+        Drum rideCymbal = new Drum("Ride Cymbal");
+        Drum splashCymbal = new Drum("Splash Cymbal");
+        Drum chinaCymbal = new Drum("China Cymbal");
+        ScheduledExecutorService executor = Executors.newScheduledThreadPool(9);
+        int initialDelay = 1000;
+        int quaver = 500; // croche
+        int crotchet = 1000; // noire
+        int minim = 2000; // blanche
+        TimeUnit unit = TimeUnit.MILLISECONDS;
+
+        Drum[] drums = {
+            bassDrum, floortom, snareDrum,
+            rackTom, hiHat, crashCymbal,
+            rideCymbal, splashCymbal, chinaCymbal
+        };
+        int[] notes = {quaver, crotchet, minim};
+
+        for (int i=0; i < 9; i++) {
+            Drum drum = drums[i];
+            int rhythm = notes[(int) (Math.random() * 3)];
+            executor.scheduleAtFixedRate(drum::play, initialDelay, rhythm, unit);
+        }
+    }
+}