done

src/test/java/lambda/part1/exercise/Lambdas01Exercise.java

@@ -1,5 +1,8 @@
 package lambda.part1.exercise;
 
+import com.google.common.base.Optional;
+import com.google.common.base.Predicate;
+import com.google.common.collect.FluentIterable;
 import com.google.common.collect.ImmutableList;
 import data.Person;
 import org.junit.Test;
@@ -20,8 +23,11 @@ public void sortPersonsByAge() {
                 new Person("name 1", "lastName 2", 40),
                 new Person("name 2", "lastName 1", 30)
         };
-
-        // TODO use Arrays.sort
+        Arrays.sort(persons, new Comparator<Person>() {
+            public int compare(Person o1, Person o2) {
+                return o1.getAge()- o2.getAge();
+            }
+        });
 
         assertArrayEquals(persons, new Person[]{
                 new Person("name 3", "lastName 3", 20),
@@ -39,8 +45,17 @@ public void findFirstWithAge30() {
         );
 
         Person person = null;
-
-        // TODO use FluentIterable
+        final Optional<Person> personOptional =
+                FluentIterable.from(persons)
+                        .firstMatch(new Predicate<Person>() {
+                            public boolean apply(Person p) {
+                                return p.getAge()== 30;
+                            }
+                        });
+
+        if (personOptional.isPresent()) {
+            person = personOptional.get();
+        }
 
         assertEquals(person, new Person("name 1", "lastName 2", 30));
     }

src/test/java/lambda/part1/exercise/Lambdas02Exercise.java

@@ -1,9 +1,12 @@
 package lambda.part1.exercise;
 
+import com.google.common.base.Optional;
+import com.google.common.collect.FluentIterable;
 import com.google.common.collect.ImmutableList;
 import data.Person;
 import org.junit.Test;
 
+import java.util.Arrays;
 import java.util.List;
 
 import static org.junit.Assert.assertArrayEquals;
@@ -17,8 +20,7 @@ public void sortPersonsByAge() {
                 new Person("name 1", "lastName 2", 40),
                 new Person("name 2", "lastName 1", 30)
         };
-
-        // TODO use Arrays.sort
+        Arrays.sort(persons, (o1, o2) -> (o1.getAge()-o2.getAge()));
 
         assertArrayEquals(persons, new Person[]{
                 new Person("name 3", "lastName 3", 20),
@@ -37,7 +39,13 @@ public void findFirstWithAge30() {
 
         Person person = null;
 
-        // TODO use FluentIterable
+        final Optional<Person> personOptional =
+                FluentIterable.from(persons)
+                        .firstMatch(p -> p.getAge() == 30);
+
+        if (personOptional.isPresent()) {
+            person=personOptional.get();
+        }
 
         assertEquals(person, new Person("name 1", "lastName 2", 30));
     }

src/test/java/lambda/part1/exercise/Lambdas03Exercise.java

@@ -18,22 +18,28 @@ default T twice(T t) {
 
     @Test
     public void generic0() {
-        final GenericProduct<Integer> prod = null; // Use anonymous class
+        final GenericProduct<Integer> prod =
+                new GenericProduct<Integer>() {
+                    @Override
+                    public Integer prod(Integer a, int i) {
+                        return a * i;
+                    }
+                };// Use anonymous class
 
         assertEquals(prod.prod(3, 2), Integer.valueOf(6));
     }
 
     @Test
     public void generic1() {
-        final GenericProduct<Integer> prod = null; // Use statement lambda
-
+        final GenericProduct<Integer> prod = (Integer a, int i) -> {
+            return a * i;
+        };
         assertEquals(prod.prod(3, 2), Integer.valueOf(6));
     }
 
     @Test
     public void generic2() {
-        final GenericProduct<Integer> prod = null; // Use expression lambda
-
+        final GenericProduct<Integer> prod = (a, i) -> a * i;
         assertEquals(prod.prod(3, 2), Integer.valueOf(6));
     }
 
@@ -47,8 +53,7 @@ private static String stringProd(String s, int i) {
 
     @Test
     public void strSum() {
-        final GenericProduct<String> prod = null; // use stringProd;
-
+        final GenericProduct<String> prod = Lambdas03Exercise::stringProd;
         assertEquals(prod.prod("a", 2), "aa");
     }
 
@@ -64,10 +69,8 @@ private String stringSumWithDelimeter(String s, int i) {
 
     @Test
     public void strSum2() {
-        final GenericProduct<String> prod = null; // use stringSumWithDelimeter;
-
+        final GenericProduct<String> prod = this::stringSumWithDelimeter;
         assertEquals(prod.prod("a", 3), "a-a-a");
     }
 
-
 }