diff --git a/src/test/java/lambda/part1/exercise/Lambdas01Exercise.java b/src/test/java/lambda/part1/exercise/Lambdas01Exercise.java
index b8656b7..dcb3f30 100644
--- a/src/test/java/lambda/part1/exercise/Lambdas01Exercise.java
+++ b/src/test/java/lambda/part1/exercise/Lambdas01Exercise.java
@@ -1,5 +1,7 @@
 package lambda.part1.exercise;
 
+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;
@@ -21,7 +23,12 @@ public void sortPersonsByAge() {
                 new Person("name 2", "lastName 1", 30)
         };
 
-        // TODO use Arrays.sort
+        Arrays.sort(persons, new Comparator<Person>() {
+            @Override
+            public int compare(Person o1, Person o2) {
+                return  Integer.compare(o1.getAge(),o2.getAge());
+            }
+        });
 
         assertArrayEquals(persons, new Person[]{
                 new Person("name 3", "lastName 3", 20),
@@ -41,7 +48,15 @@ public void findFirstWithAge30() {
         Person person = null;
 
         // TODO use FluentIterable
+        person = FluentIterable.from(persons)
+                .firstMatch(new Predicate<Person>() {
+                    @Override
+                    public boolean apply(Person p) {
+                        return p.getAge() == 30;
+                    }
+                }).get();
 
         assertEquals(person, new Person("name 1", "lastName 2", 30));
     }
 }
+
diff --git a/src/test/java/lambda/part1/exercise/Lambdas02Exercise.java b/src/test/java/lambda/part1/exercise/Lambdas02Exercise.java
index da29209..9601049 100644
--- a/src/test/java/lambda/part1/exercise/Lambdas02Exercise.java
+++ b/src/test/java/lambda/part1/exercise/Lambdas02Exercise.java
@@ -1,9 +1,12 @@
 package lambda.part1.exercise;
 
+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.Comparator;
 import java.util.List;
 
 import static org.junit.Assert.assertArrayEquals;
@@ -18,7 +21,7 @@ public void sortPersonsByAge() {
                 new Person("name 2", "lastName 1", 30)
         };
 
-        // TODO use Arrays.sort
+        Arrays.sort(persons, Comparator.comparingInt(p -> p.getAge()));
 
         assertArrayEquals(persons, new Person[]{
                 new Person("name 3", "lastName 3", 20),
@@ -35,10 +38,8 @@ public void findFirstWithAge30() {
                 new Person("name 2", "lastName 1", 30)
         );
 
-        Person person = null;
-
-        // TODO use FluentIterable
+        Person person = FluentIterable.from(persons).firstMatch(p -> p.getAge() == 30).get();
 
         assertEquals(person, new Person("name 1", "lastName 2", 30));
     }
-}
+}
\ No newline at end of file
diff --git a/src/test/java/lambda/part1/exercise/Lambdas03Exercise.java b/src/test/java/lambda/part1/exercise/Lambdas03Exercise.java
index 59d3972..69b5fe6 100644
--- a/src/test/java/lambda/part1/exercise/Lambdas03Exercise.java
+++ b/src/test/java/lambda/part1/exercise/Lambdas03Exercise.java
@@ -18,21 +18,29 @@ 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 3 * 2;
+            }
+        };
 
         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 i1, int i2) -> {
+                    return i1 * i2;
+                };
 
         assertEquals(prod.prod(3, 2), Integer.valueOf(6));
     }
 
     @Test
     public void generic2() {
-        final GenericProduct<Integer> prod = null; // Use expression lambda
+        final GenericProduct<Integer> prod = (i1, i2) -> i1 * i2; // Use expression lambda
 
         assertEquals(prod.prod(3, 2), Integer.valueOf(6));
     }
@@ -47,7 +55,7 @@ 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; // use stringProd;
 
         assertEquals(prod.prod("a", 2), "aa");
     }
@@ -64,10 +72,9 @@ private String stringSumWithDelimeter(String s, int i) {
 
     @Test
     public void strSum2() {
-        final GenericProduct<String> prod = null; // use stringSumWithDelimeter;
+        final GenericProduct<String> prod = this::stringSumWithDelimeter; // use stringSumWithDelimeter;
 
         assertEquals(prod.prod("a", 3), "a-a-a");
     }
 
-
 }