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Nazarov_Anton/part-1 #162

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6847c75
part-1 done
Jul 4, 2017
2e82de5
Fix boxing
Jul 4, 2017
63a394b
Fix Comparator
Jul 5, 2017
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22 changes: 17 additions & 5 deletions src/test/java/lambda/part1/exercise/Lambdas01Exercise.java
View file
Original file line number Diff line number Diff line change
@@ -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;
@@ -21,7 +24,13 @@ 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),
@@ -38,10 +47,13 @@ public void findFirstWithAge30() {
new Person("name 2", "lastName 1", 30)
);

Person person = null;

// TODO use FluentIterable
Optional<Person> person = FluentIterable.from(persons)
.firstMatch(new Predicate<Person>() {
public boolean apply(Person p) {
return (p.getAge() == 30);
}
});

assertEquals(person, new Person("name 1", "lastName 2", 30));
assertEquals(person.get(), new Person("name 1", "lastName 2", 30));
}
}
15 changes: 10 additions & 5 deletions src/test/java/lambda/part1/exercise/Lambdas02Exercise.java
View file
Original file line number Diff line number Diff line change
@@ -1,10 +1,16 @@
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.Comparator;
import java.util.List;
import java.util.function.Predicate;
import java.util.function.ToIntFunction;

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
@@ -18,7 +24,7 @@ public void sortPersonsByAge() {
new Person("name 2", "lastName 1", 30)
};

// TODO use Arrays.sort
Arrays.sort(persons, Comparator.comparingInt(Person::getAge));

assertArrayEquals(persons, new Person[]{
new Person("name 3", "lastName 3", 20),
@@ -35,10 +41,9 @@ public void findFirstWithAge30() {
new Person("name 2", "lastName 1", 30)
);

Person person = null;
Optional<Person> person = FluentIterable.from(persons)
.firstMatch(p -> p.getAge() == 30);

// TODO use FluentIterable

assertEquals(person, new Person("name 1", "lastName 2", 30));
assertEquals(person.get(), new Person("name 1", "lastName 2", 30));
}
}
20 changes: 12 additions & 8 deletions src/test/java/lambda/part1/exercise/Lambdas03Exercise.java
View file
Original file line number Diff line number Diff line change
@@ -18,21 +18,27 @@ 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;
}
};
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));
}
@@ -47,7 +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 +70,8 @@ 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");
}


}