Challenge 38.

JavaZakariae · JavaZakariae · commit 0ff5e5157c29 · 2019-11-11T14:59:30.000+01:00
Method Reference VS Lambda expression.
diff --git a/src/main/java/challenge31_40/Challenge_38.java b/src/main/java/challenge31_40/Challenge_38.java
@@ -0,0 +1,41 @@
+package challenge31_40;
+
+/**
+ * Method reference vs Lambda
+ * Lambda expression as runnable implementation will be not executed only if we call the run method.
+ *   + in every run() call, a new instance is created (constructor call).
+ *   + Lambda is lazy
+ *
+ * Method reference
+ *  the constructor is called only one time, the method reference is called only if we call the run method.
+ *
+ * // TODO: 11/11/2019
+ * what are the implementation we can pass to the Runnable interface.
+ */
+public class Challenge_38 {
+
+    public static void main( String[] args ) {
+        Runnable universeImpactRunnable = () -> new ChuckNorris().roundHouseKick();
+        Runnable galaxyImpactRunnable = new ChuckNorris()::roundHouseKick;
+
+        System.out.println("The galaxy is finished = ");
+
+        universeImpactRunnable.run();
+        universeImpactRunnable.run();
+
+        galaxyImpactRunnable.run();
+        galaxyImpactRunnable.run();
+    }
+
+    static class ChuckNorris{
+        private static int numberOfKicks;
+        private int galaxyDamage;
+
+        public ChuckNorris() {
+            this.galaxyDamage = numberOfKicks++;
+        }
+        void roundHouseKick(){
+            System.out.println(this.galaxyDamage);
+        }
+    }
+}
