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BAEL-5419: List vs ArrayList in Java + tests (#11936) 

* BAEL-5419: List vs ArrayList in Java + tests

* BAEL-5419: Updated code +tests as per review comments

* BAEL-5419: Fixed failing tests

* BAEL-5419: Fixed JUnit test as per review comments
This commit is contained in:
Palaniappan Arunachalam 2022-04-15 02:11:00 +05:30 committed by GitHub
parent b67525c5c1
commit 3045fea670
5 changed files with 336 additions and 0 deletions
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51
core-java-modules/core-java-collections-list-3/src/main/java/com/baeldung/list/listvsarraylist/ArrayListDemo.java Normal file
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package com.baeldung.list.listvsarraylist;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Locale;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class ArrayListDemo {
private ArrayList<Passenger> passengers = new ArrayList<>(20);
// private LinkedList<Passenger> passengers = new LinkedList<>(); // compile time error
public ArrayList<Passenger> addPassenger(Passenger passenger) {
passengers.add(passenger);
return passengers;
}
public ArrayList<Passenger> removePassenger(Passenger passenger) {
passengers.remove(passenger);
return passengers;
}
public ArrayList<Passenger> getPassengersBySource(String source) {
return new ArrayList<Passenger>(passengers.stream()
.filter(it -> it.getSource().equals(source))
.collect(Collectors.toList()));
}
public ArrayList<Passenger> getPassengersByDestination(String destination) {
return new ArrayList<Passenger> (passengers.stream()
.filter(it -> it.getDestination().equals(destination))
.collect(Collectors.toList()));
}
public long getKidsCount(ArrayList<Passenger> passengerList) {
return passengerList.stream()
.filter(it -> (it.getAge() <= 10))
.count();
}
public ArrayList<Passenger> getFinalPassengersList() {
return new ArrayList<Passenger> (Collections.unmodifiableList(passengers));
}
public ArrayList<String> getServicedCountries() {
return new ArrayList<String> (Stream.of(Locale.getISOCountries())
.collect(Collectors.toList()));
}
}

53
core-java-modules/core-java-collections-list-3/src/main/java/com/baeldung/list/listvsarraylist/ListDemo.java Normal file
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package com.baeldung.list.listvsarraylist;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class ListDemo {
private List<Passenger> passengers = new ArrayList<>(20);
// private List<Passenger> passengers = new LinkedList<>(); // No compile time error
public List<Passenger> addPassenger(Passenger passenger) {
passengers.add(passenger);
return passengers;
}
public List<Passenger> removePassenger(Passenger passenger) {
passengers.remove(passenger);
return passengers;
}
public List<Passenger> getPassengersBySource(String source) {
return passengers.stream()
.filter(it -> it.getSource().equals(source))
.collect(Collectors.toList());
}
public List<Passenger> getPassengersByDestination(String destination) {
return passengers.stream()
.filter(it -> it.getDestination().equals(destination))
.collect(Collectors.toList());
}
public long getKidsCount(List<Passenger> passengerList) {
return passengerList.stream()
.filter(it -> (it.getAge() <= 10))
.count();
}
public List<Passenger> getFinalPassengersList() {
return Collections.unmodifiableList(passengers);
}
public List<String> getServicedCountries() {
return Stream.of(Locale.getISOCountries())
.collect(Collectors.toList());
}
}

49
core-java-modules/core-java-collections-list-3/src/main/java/com/baeldung/list/listvsarraylist/Passenger.java Normal file
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package com.baeldung.list.listvsarraylist;
public class Passenger {
private String name;
private int age;
private String source;
private String destination;
public Passenger(String name, int age, String source, String destination) {
this.name = name;
this.age = age;
this.source = source;
this.destination = destination;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getSource() {
return source;
}
public void setSource(String source) {
this.source = source;
}
public String getDestination() {
return destination;
}
public void setDestination(String destination) {
this.destination = destination;
}
}

91
core-java-modules/core-java-collections-list-3/src/test/java/com/baeldung/list/listvsarraylist/ArrayListDemoUnitTest.java Normal file
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package com.baeldung.list.listvsarraylist;
import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.Assert.assertNotNull;
import java.util.ArrayList;
import java.util.Locale;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
class ArrayListDemoUnitTest {
ArrayListDemo application = new ArrayListDemo();
Passenger passenger1;
Passenger passenger2;
Passenger passenger3;
@BeforeEach
protected void setUp() {
passenger1 = new Passenger("Anna", 25, "London", "New York");
passenger2 = new Passenger("Binny", 35, "New York", "London");
passenger3 = new Passenger("Chandra", 8, "Paris", "New Delhi");
application.addPassenger(passenger1);
application.addPassenger(passenger2);
application.addPassenger(passenger3);
}
@Test
public void givenEmptyList_whenAddedPassenger_thenReturnCurrentPassengerList() {
ArrayList<Passenger> list = application.addPassenger(new Passenger("David", 54, "Milan", "Paris"));
assertNotNull(list);
assertThat(list).hasSize(4);
}
@Test
public void givenPassengerList_whenRemovedPassenger_thenReturnCurrentPassengerList() {
ArrayList<Passenger> list = application.removePassenger(passenger3);
assertNotNull(list);
assertThat(list).hasSize(2);
}
@Test
public void givenPassengerList_whenPassedWithSourceCity_thenReturnMatchingPassengerList() {
ArrayList<Passenger> list = application.getPassengersBySource("Singapore");
ArrayList<Passenger> list2 = application.getPassengersBySource("London");
assertThat(list).isEmpty();
assertThat(list2.get(0)).isEqualTo(passenger1);
}
@Test
public void givenPassengerList_whenPassedWithDestinationCity_thenReturnMatchingPassengerList() {
ArrayList<Passenger> list = application.getPassengersByDestination("Singapore");
ArrayList<Passenger> list2 = application.getPassengersByDestination("London");
assertThat(list).isEmpty();
assertThat(list2.get(0)).isEqualTo(passenger2);
}
@Test
public void givenPassengerList_whenFindKidsByAge_thenReturnKidsList() {
ArrayList<Passenger> list = new ArrayList<>();
list.add(passenger1);
list.add(passenger2);
list.add(passenger3);
long count = application.getKidsCount(list);
assertThat(count).isEqualTo(1);
}
@Test
public void givenPassengerList_whenCalledWithCollectionsFunction_thenReturnsListType() {
ArrayList<Passenger> list = application.getFinalPassengersList();
assertNotNull(list);
assertThat(list).hasSize(3);
}
@Test
public void givenCurrentLocale_whenUsingStreams_thenReturnsListType() {
ArrayList<String> servicedCountries = application.getServicedCountries();
assertNotNull(servicedCountries);
assertThat(servicedCountries).hasSize(Locale.getISOCountries().length);
}
}

92
core-java-modules/core-java-collections-list-3/src/test/java/com/baeldung/list/listvsarraylist/ListDemoUnitTest.java Normal file
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package com.baeldung.list.listvsarraylist;
import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.Assert.assertNotNull;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
class ListDemoUnitTest {
ListDemo application = new ListDemo();
Passenger passenger1;
Passenger passenger2;
Passenger passenger3;
@BeforeEach
protected void setUp() {
passenger1 = new Passenger("Anna", 25, "London", "New York");
passenger2 = new Passenger("Binny", 35, "New York", "London");
passenger3 = new Passenger("Chandra", 8, "Paris", "New Delhi");
application.addPassenger(passenger1);
application.addPassenger(passenger2);
application.addPassenger(passenger3);
}
@Test
public void givenEmptyList_whenAddedPassenger_thenReturnCurrentPassengerList() {
List<Passenger> list = application.addPassenger(new Passenger("David", 54, "Milan", "Paris"));
assertNotNull(list);
assertThat(list).hasSize(4);
}
@Test
public void givenPresentList_whenRemovedPassenger_thenReturnCurrentPassengerList() {
List<Passenger> list = application.removePassenger(passenger3);
assertNotNull(list);
assertThat(list).hasSize(2);
}
@Test
public void givenPresentList_whenPassedWithSourceCity_thenReturnMatchingPassengerList() {
List<Passenger> list = application.getPassengersBySource("Singapore");
List<Passenger> list2 = application.getPassengersBySource("London");
assertThat(list).isEmpty();
assertThat(list2.get(0)).isEqualTo(passenger1);
}
@Test
public void givenPresentList_whenPassedWithDestinationCity_thenReturnMatchingPassengerList() {
List<Passenger> list = application.getPassengersByDestination("Singapore");
List<Passenger> list2 = application.getPassengersByDestination("London");
assertThat(list).isEmpty();
assertThat(list2.get(0)).isEqualTo(passenger2);
}
@Test
public void givenPassengerList_whenFindKidsByAge_thenReturnKidsList() {
List<Passenger> list = new ArrayList<>();
list.add(passenger1);
list.add(passenger2);
list.add(passenger3);
long count = application.getKidsCount(list);
assertThat(count).isEqualTo(1);
}
@Test
public void givenPresentList_whenCalledWithCollectionsFunction_thenReturnsListType() {
List<Passenger> list = application.getFinalPassengersList();
assertNotNull(list);
assertThat(list).hasSize(3);
}
@Test
public void givenCurrentLocale_whenUsingStreams_thenReturnsListType() {
List<String> servicedCountries = application.getServicedCountries();
assertNotNull(servicedCountries);
assertThat(servicedCountries).hasSize(Locale.getISOCountries().length);
}
}