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This commit is contained in:
Niket Agrawal 2023-10-12 02:58:49 +05:30
parent a78b189d69
commit 3caca638de
2 changed files with 48 additions and 25 deletions
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21
core-java-modules/core-java-streams-5/src/main/java/com/baeldung/streams/firstmatchingelement/User.java Normal file
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@ -0,0 +1,21 @@
package com.baeldung.streams.firstmatchingelement;
public class User {
private String userName;
private Integer userId;
public User(Integer userId, String userName) {
this.userId = userId;
this.userName = userName;
}
public String getUserName() {
return userName;
}
public Integer getUserId() {
return userId;
}
}

52
core-java-modules/core-java-streams-5/src/test/java/com/baeldung/streams/firstmatchingelement/FirstMatchingElementUnitTest.java
View File

@ -15,26 +15,27 @@ import com.google.common.collect.Iterables;
public class FirstMatchingElementUnitTest {
private final List<Object> dataList = Lists.newArrayList("String", Boolean.TRUE, Integer.valueOf(10), Boolean.FALSE, Double.valueOf(20.0));
private List<User> userList = Lists.newArrayList(new User(1, "David"), new User(2, "John"), new User(3, "Roger"), new User(4, "John"));
private String searchName = "John";
@Test
public void whenCalled_thenFindIndexUsingStream() {
int index = dataList.stream()
.filter(data -> data instanceof Boolean)
.mapToInt(data -> dataList.indexOf(data))
public void whenUsingIndexOf_thenFindFirstMatchingUserIndex() {
int index = userList.stream()
.filter(user -> searchName.equals(user.getUserName()))
.mapToInt(user -> userList.indexOf(user))
.findFirst()
.orElse(-1);
assertEquals(1, index);
}
@Test
public void whenCalled_thenFindIndexUsingStreamIterator() {
public void whenUsingIterator_thenFindFirstMatchingUserIndex() {
int index = -1;
Iterator<Object> iterator = dataList.iterator();
Iterator<User> iterator = userList.iterator();
while (iterator.hasNext()) {
Object data = iterator.next();
if (data instanceof Boolean) {
index = dataList.indexOf(data);
User user = iterator.next();
if (searchName.equals(user.getUserName())) {
index = userList.indexOf(user);
break;
}
}
@ -42,11 +43,12 @@ public class FirstMatchingElementUnitTest {
}
@Test
public void whenCalled_thenFindIndexUsingStreamListIterator() {
public void whenUsingListIterator_thenFindFirstMatchingUserIndex() {
int index = -1;
ListIterator<Object> listIterator = dataList.listIterator();
ListIterator<User> listIterator = userList.listIterator();
while (listIterator.hasNext()) {
if (listIterator.next() instanceof Boolean) {
if (searchName.equals(listIterator.next()
.getUserName())) {
index = listIterator.previousIndex();
break;
}
@ -55,20 +57,20 @@ public class FirstMatchingElementUnitTest {
}
@Test
public void whenCalled_thenFindIndexUsingIntStream() {
int index = IntStream.range(0, dataList.size() - 1)
.filter(streamIndex -> dataList.get(streamIndex) instanceof Boolean)
public void whenUsingIntStream_thenFindFirstMatchingUserIndex() {
int index = IntStream.range(0, userList.size() - 1)
.filter(streamIndex -> searchName.equals(userList.get(streamIndex).getUserName()))
.findFirst()
.orElse(-1);
assertEquals(1, index);
}
@Test
public void whenCalled_thenFindIndexUsingStreamTakeWhile() {
int lastIndex = dataList.size() - 1;
int predicateIndex = dataList.stream()
.takeWhile(data -> !(data instanceof Boolean))
.mapToInt(dataList::indexOf)
public void whenUsingTakeWhile_thenFindFirstMatchingUserIndex() {
int lastIndex = userList.size() - 1;
int predicateIndex = userList.stream()
.takeWhile(user -> !(searchName.equals(user.getUserName())))
.mapToInt(userList::indexOf)
.max()
.orElse(-1);
@ -80,14 +82,14 @@ public class FirstMatchingElementUnitTest {
}
@Test
public void whenCalled_thenFindIndexUsingGoogleGuava() {
int index = Iterables.indexOf(dataList, data -> data instanceof Boolean);
public void whenUsingGoogleGuava_thenFindFirstMatchingUserIndex() {
int index = Iterables.indexOf(userList, user -> searchName.equals(user.getUserName()));
assertEquals(1, index);
}
@Test
public void whenCalled_thenFindIndexUsingApacheCommons() {
int index = IterableUtils.indexOf(dataList, data -> data instanceof Boolean);
public void whenUsingApacheCommons_thenFindFirstMatchingUserIndex() {
int index = IterableUtils.indexOf(userList, user -> searchName.equals(user.getUserName()));
assertEquals(1, index);
}
}