Refactor code

src/com/codecafe/java8/functionalinterfaces/ComparatorLambdaExample.java

@@ -7,7 +7,7 @@ public class ComparatorLambdaExample {
   public static void main(String[] args) {
 
     // prior to Java 8
-    Comparator<Integer> comparator = new Comparator<Integer>() {
+    Comparator<Integer> comparator = new Comparator<>() {
 
       @Override
       public int compare(Integer arg0, Integer arg1) {

src/com/codecafe/java8/functionalprogramming/designpatterns/decorator/example2/BurgerShop.java

@@ -5,7 +5,7 @@
 // it will do the job of adding the decoration
 public class BurgerShop {
 
-  Function<Burger, Burger> decoration;
+  private final Function<Burger, Burger> decoration;
 
   public BurgerShop(Function<Burger, Burger> decoration) {
     this.decoration = decoration;

src/com/codecafe/java8/functionalprogramming/designpatterns/iterator/MyArrayList.java

@@ -11,8 +11,8 @@ public MyArrayList(Object[] elements) {
   }
 
   public void forEach(Consumer<Object> action) {
-    for (int i = 0; i < elements.length; i++)
-      action.accept(elements[i]);
+    for (Object element : elements)
+      action.accept(element);
   }
 
 }

src/com/codecafe/java8/hiddentreasures/PureFunctions.java

@@ -21,10 +21,7 @@ public static void main(String[] args) {
 
   public static boolean isGT3(int number) {
     System.out.println("isGT3 called for number " + number);
-    if (number > 3)
-      return true;
-    else
-      return false;
+    return number > 3;
   }
 
   public static int doubleIt(int number) {
@@ -34,10 +31,7 @@ public static int doubleIt(int number) {
 
   public static boolean isEven(int number) {
     System.out.println("isEven called for number " + number);
-    if (number % 2 == 0)
-      return true;
-    else
-      return false;
+    return number % 2 == 0;
   }
 
 }

src/com/codecafe/java8/lambdas/foundation/SortStrings.java

@@ -18,7 +18,7 @@ public static void main(String[] args) {
     List<String> words1 = Arrays.asList("ab", "abcd", "abc", "abcde", "a", "abcdef");
 
     // clumsy anonymous inner class method
-    Collections.sort(words1, new Comparator<String>() {
+    Collections.sort(words1, new Comparator<>() {
       @Override
       public int compare(String s1, String s2) {
         return Integer.compare(s1.length(), s2.length());

src/com/codecafe/java8/lambdas/foundation/exercise/Java7Style_Solution_1.java

@@ -22,7 +22,7 @@ public static void main(String[] args) {
     );
 
     // Sort list by last name
-    Collections.sort(people, new Comparator<Person>() {
+    Collections.sort(people, new Comparator<>() {
 
       @Override
       public int compare(Person p1, Person p2) {

src/com/codecafe/java8/lambdas/foundation/exercise/Java7Style_Solution_2.java

@@ -22,7 +22,7 @@ public static void main(String[] args) {
     );
 
     // Sort list by last name
-    Collections.sort(people, new Comparator<Person>() {
+    Collections.sort(people, new Comparator<>() {
 
       @Override
       public int compare(Person p1, Person p2) {