#502 Replaced usages of System.out with logger.

lazy-loading/src/main/java/com/iluwatar/lazy/loading/Heavy.java

@@ -22,6 +22,9 @@
  */
 package com.iluwatar.lazy.loading;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 /**
  * 
  * Heavy objects are expensive to create.
@@ -29,16 +32,18 @@ package com.iluwatar.lazy.loading;
  */
 public class Heavy {
 
+  private static final Logger LOGGER = LoggerFactory.getLogger(Heavy.class);
+
   /**
    * Constructor
    */
   public Heavy() {
-    System.out.println("Creating Heavy ...");
+    LOGGER.info("Creating Heavy ...");
     try {
       Thread.sleep(1000);
     } catch (InterruptedException e) {
-      e.printStackTrace();
+      LOGGER.error("Exception caught.", e);
     }
-    System.out.println("... Heavy created");
+    LOGGER.info("... Heavy created");
   }
 }