Update App.java

johntd8 · web-flow · commit b981bfc880e6 · 2016-08-20T17:49:23.000-04:00
Added additional explanation on retainAll() and removeAll() methods.
diff --git a/55 - Sets/src/App.java b/55 - Sets/src/App.java
@@ -61,18 +61,18 @@ public static void main(String[] args) {
          
         ////////////// Intersection ///////////////////
          
-        Set<String> intersection = new HashSet<String>(set1);
+        Set<String> intersection = new HashSet<String>(set1);  
          
-        intersection.retainAll(set2);
+        intersection.retainAll(set2);  // keeps similarities between set 1 and set 2
          
         System.out.println(intersection);
          
         ////////////// Difference /////////////////////////
          
-        Set<String> difference = new HashSet<String>(set2);
+        Set<String> difference = new HashSet<String>(set2);  
          
-        difference.removeAll(set1);
+        difference.removeAll(set1);   // removes differences between set1 and set2, prints what is left of set2
         System.out.println(difference);
     }
  
-}
+}
