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Merge branch 'eugenp:master' into master

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This commit is contained in:
Ulisses Lima
2023-06-07 12:18:36 -03:00
committed by GitHub
parent 95e8e24ddd c023d77d39
commit b0e5cff217
256 changed files with 2687 additions and 506 deletions
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algorithms-modules/algorithms-miscellaneous-3/README.md
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@@ -10,7 +10,7 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
- [Converting Between Roman and Arabic Numerals in Java](https://www.baeldung.com/java-convert-roman-arabic)
- [Practical Java Examples of the Big O Notation](https://www.baeldung.com/java-algorithm-complexity)
- [Checking If a List Is Sorted in Java](https://www.baeldung.com/java-check-if-list-sorted)
- [Checking if a Java Graph has a Cycle](https://www.baeldung.com/java-graph-has-a-cycle)
- [Checking if a Java Graph Has a Cycle](https://www.baeldung.com/java-graph-has-a-cycle)
- [A Guide to the Folding Technique in Java](https://www.baeldung.com/folding-hashing-technique)
- [Creating a Triangle with for Loops in Java](https://www.baeldung.com/java-print-triangle)
- [The K-Means Clustering Algorithm in Java](https://www.baeldung.com/java-k-means-clustering-algorithm)
algorithms-modules/algorithms-miscellaneous-4/README.md
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@@ -5,10 +5,10 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
### Relevant articles:
- [Multi-Swarm Optimization Algorithm in Java](https://www.baeldung.com/java-multi-swarm-algorithm)
- [Check If a String Contains All The Letters of The Alphabet with Java](https://www.baeldung.com/java-string-contains-all-letters)
- [Check if a String Contains All the Letters of the Alphabet With Java](https://www.baeldung.com/java-string-contains-all-letters)
- [Find the Middle Element of a Linked List in Java](https://www.baeldung.com/java-linked-list-middle-element)
- [Find Substrings That Are Palindromes in Java](https://www.baeldung.com/java-palindrome-substrings)
- [Find the Longest Substring without Repeating Characters](https://www.baeldung.com/java-longest-substring-without-repeated-characters)
- [Find the Longest Substring Without Repeating Characters](https://www.baeldung.com/java-longest-substring-without-repeated-characters)
- [Permutations of an Array in Java](https://www.baeldung.com/java-array-permutations)
- [Find the Smallest Missing Integer in an Array](https://www.baeldung.com/java-smallest-missing-integer-in-array)
- [Permutations of a String in Java](https://www.baeldung.com/java-string-permutations)
algorithms-modules/algorithms-miscellaneous-5/README.md
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@@ -9,7 +9,7 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
- [Reversing a Binary Tree in Java](https://www.baeldung.com/java-reversing-a-binary-tree)
- [Find If Two Numbers Are Relatively Prime in Java](https://www.baeldung.com/java-two-relatively-prime-numbers)
- [Knapsack Problem Implementation in Java](https://www.baeldung.com/java-knapsack)
- [How to Determine if a Binary Tree is Balanced in Java](https://www.baeldung.com/java-balanced-binary-tree)
- [How to Determine if a Binary Tree Is Balanced in Java](https://www.baeldung.com/java-balanced-binary-tree)
- [Overview of Combinatorial Problems in Java](https://www.baeldung.com/java-combinatorial-algorithms)
- [Prim’s Algorithm with a Java Implementation](https://www.baeldung.com/java-prim-algorithm)
- [Maximum Subarray Problem in Java](https://www.baeldung.com/java-maximum-subarray)
apache-cxf-modules/sse-jaxrs/README.md
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@@ -1,3 +1,3 @@
### Relevant Articles:
- [Server-Sent Events (SSE) In JAX-RS](https://www.baeldung.com/java-ee-jax-rs-sse)
- [Server-Sent Events (SSE) in JAX-RS](https://www.baeldung.com/java-ee-jax-rs-sse)
apache-httpclient/pom.xml
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@@ -90,6 +90,12 @@
</exclusions>
</dependency>
<dependency>
<groupId>org.mock-server</groupId>
<artifactId>mockserver-netty</artifactId>
<version>${mockserver.version}</version>
</dependency>
<dependency>
<groupId>com.github.tomakehurst</groupId>
<artifactId>wiremock</artifactId>
@@ -112,6 +118,7 @@
<!-- util -->
<httpasyncclient.version>4.1.4</httpasyncclient.version>
<!-- testing -->
<mockserver.version>5.6.1</mockserver.version>
<wiremock.version>2.5.1</wiremock.version>
<httpclient.version>4.5.8</httpclient.version> <!-- 4.3.6 --> <!-- 4.4-beta1 -->
<!-- http client & core 5 -->
apache-httpclient/src/test/java/com/baeldung/httpclient/GetRequestMockServer.java
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@@ -0,0 +1,79 @@
package com.baeldung.httpclient;
import static org.mockserver.integration.ClientAndServer.startClientAndServer;
import static org.mockserver.matchers.Times.exactly;
import static org.mockserver.model.HttpRequest.request;
import static org.mockserver.model.HttpResponse.response;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.URISyntaxException;
import org.apache.http.HttpStatus;
import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.BeforeAll;
import org.mockserver.client.MockServerClient;
import org.mockserver.integration.ClientAndServer;
public class GetRequestMockServer {
public static ClientAndServer mockServer;
public static String serviceOneUrl;
public static String serviceTwoUrl;
public static int serverPort;
public static final String SERVER_ADDRESS = "127.0.0.1";
public static final String PATH_ONE = "/test1";
public static final String PATH_TWO = "/test2";
public static final String METHOD = "GET";
@BeforeAll
static void startServer() throws IOException {
serverPort = getFreePort();
System.out.println("Free port "+serverPort);
serviceOneUrl = "http://" + SERVER_ADDRESS + ":" + serverPort + PATH_ONE;
serviceTwoUrl = "http://" + SERVER_ADDRESS + ":" + serverPort + PATH_TWO;
mockServer = startClientAndServer(serverPort);
mockGetRequest();
}
@AfterAll
static void stopServer() {
mockServer.stop();
}
private static void mockGetRequest() {
new MockServerClient(SERVER_ADDRESS, serverPort)
.when(
request()
.withPath(PATH_ONE)
.withMethod(METHOD),
exactly(5)
)
.respond(
response()
.withStatusCode(HttpStatus.SC_OK)
.withBody("{\"status\":\"ok\"}")
);
new MockServerClient(SERVER_ADDRESS, serverPort)
.when(
request()
.withPath(PATH_TWO)
.withMethod(METHOD),
exactly(1)
)
.respond(
response()
.withStatusCode(HttpStatus.SC_OK)
.withBody("{\"status\":\"ok\"}")
);
}
private static int getFreePort () throws IOException {
try (ServerSocket serverSocket = new ServerSocket(0)) {
return serverSocket.getLocalPort();
}
}
}
apache-httpclient/src/test/java/com/baeldung/httpclient/HttpAsyncClientLiveTest.java
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@@ -9,6 +9,7 @@ import java.util.concurrent.Future;
import javax.net.ssl.SSLContext;
import org.apache.hc.client5.http.impl.routing.DefaultProxyRoutePlanner;
import org.junit.jupiter.api.Test;
import org.apache.hc.client5.http.async.methods.SimpleHttpRequest;
@@ -38,7 +39,7 @@ import org.apache.hc.core5.ssl.SSLContexts;
import org.apache.hc.core5.ssl.TrustStrategy;
class HttpAsyncClientLiveTest {
class HttpAsyncClientLiveTest extends GetRequestMockServer {
private static final String HOST = "http://www.google.com";
private static final String HOST_WITH_SSL = "https://mms.nw.ru/";
@@ -55,12 +56,12 @@ class HttpAsyncClientLiveTest {
@Test
void whenUseHttpAsyncClient_thenCorrect() throws InterruptedException, ExecutionException, IOException {
final HttpHost target = new HttpHost(HOST);
final HttpHost target = new HttpHost(HOST_WITH_COOKIE);
final SimpleHttpRequest request = SimpleRequestBuilder.get()
.setHttpHost(target)
.build();
final CloseableHttpAsyncClient client = HttpAsyncClients.createDefault();
final CloseableHttpAsyncClient client = HttpAsyncClients.custom().build();
client.start();
@@ -102,30 +103,15 @@ class HttpAsyncClientLiveTest {
@Test
void whenUseProxyWithHttpClient_thenCorrect() throws Exception {
final CloseableHttpAsyncClient client = HttpAsyncClients.createDefault();
final HttpHost proxy = new HttpHost("127.0.0.1", GetRequestMockServer.serverPort);
DefaultProxyRoutePlanner routePlanner = new DefaultProxyRoutePlanner(proxy);
final CloseableHttpAsyncClient client = HttpAsyncClients.custom()
.setRoutePlanner(routePlanner)
.build();
client.start();
final HttpHost proxy = new HttpHost("127.0.0.1", 8080);
final RequestConfig config = RequestConfig.custom().setProxy(proxy).build();
final SimpleHttpRequest request = new SimpleHttpRequest("GET" ,HOST_WITH_PROXY);
request.setConfig(config);
final Future<SimpleHttpResponse> future = client.execute(request, new FutureCallback<>(){
@Override
public void completed(SimpleHttpResponse response) {
System.out.println("responseData");
}
@Override
public void failed(Exception ex) {
System.out.println("Error executing HTTP request: " + ex.getMessage());
}
@Override
public void cancelled() {
System.out.println("HTTP request execution cancelled");
}
});
final Future<SimpleHttpResponse> future = client.execute(request, null);
final HttpResponse response = future.get();
assertThat(response.getCode(), equalTo(200));
client.close();
apache-httpclient4/src/test/java/com/baeldung/httpclient/GetRequestMockServer.java
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@@ -0,0 +1,77 @@
package com.baeldung.httpclient;
import static org.mockserver.integration.ClientAndServer.startClientAndServer;
import static org.mockserver.matchers.Times.exactly;
import static org.mockserver.model.HttpRequest.request;
import static org.mockserver.model.HttpResponse.response;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.URISyntaxException;
import org.apache.http.HttpStatus;
import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.BeforeAll;
import org.mockserver.client.MockServerClient;
import org.mockserver.integration.ClientAndServer;
public class GetRequestMockServer {
public static ClientAndServer mockServer;
public static String serviceOneUrl;
public static String serviceTwoUrl;
public static int serverPort;
public static final String SERVER_ADDRESS = "127.0.0.1";
public static final String PATH_ONE = "/test1";
public static final String PATH_TWO = "/test2";
public static final String METHOD = "GET";
@BeforeAll
static void startServer() throws IOException, URISyntaxException {
serverPort = getFreePort();
serviceOneUrl = "http://" + SERVER_ADDRESS + ":" + serverPort + PATH_ONE;
serviceTwoUrl = "http://" + SERVER_ADDRESS + ":" + serverPort + PATH_TWO;
mockServer = startClientAndServer(serverPort);
mockGetRequest();
}
@AfterAll
static void stopServer() {
mockServer.stop();
}
private static void mockGetRequest() {
new MockServerClient(SERVER_ADDRESS, serverPort)
.when(
request()
.withPath(PATH_ONE)
.withMethod(METHOD),
exactly(5)
)
.respond(
response()
.withStatusCode(HttpStatus.SC_OK)
.withBody("{\"status\":\"ok\"}")
);
new MockServerClient(SERVER_ADDRESS, serverPort)
.when(
request()
.withPath(PATH_TWO)
.withMethod(METHOD),
exactly(1)
)
.respond(
response()
.withStatusCode(HttpStatus.SC_OK)
.withBody("{\"status\":\"ok\"}")
);
}
private static int getFreePort () throws IOException {
try (ServerSocket serverSocket = new ServerSocket(0)) {
return serverSocket.getLocalPort();
}
}
}
apache-httpclient4/src/test/java/com/baeldung/httpclient/HttpAsyncClientV4LiveTest.java
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@@ -31,7 +31,8 @@ import org.apache.http.protocol.HttpContext;
import org.apache.http.ssl.SSLContexts;
import org.junit.jupiter.api.Test;
class HttpAsyncClientV4LiveTest {
class HttpAsyncClientV4LiveTest extends GetRequestMockServer {
private static final String HOST = "http://www.google.com";
private static final String HOST_WITH_SSL = "https://mms.nw.ru/";
@@ -87,7 +88,7 @@ class HttpAsyncClientV4LiveTest {
void whenUseProxyWithHttpClient_thenCorrect() throws Exception {
final CloseableHttpAsyncClient client = HttpAsyncClients.createDefault();
client.start();
final HttpHost proxy = new HttpHost("127.0.0.1", 8080);
final HttpHost proxy = new HttpHost("127.0.0.1", GetRequestMockServer.serverPort);
final RequestConfig config = RequestConfig.custom().setProxy(proxy).build();
final HttpGet request = new HttpGet(HOST_WITH_PROXY);
request.setConfig(config);
apache-kafka-2/README.md
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@@ -9,3 +9,5 @@ You can build the project from the command line using: *mvn clean install*, or i
- [Guide to Check if Apache Kafka Server Is Running](https://www.baeldung.com/apache-kafka-check-server-is-running)
- [Add Custom Headers to a Kafka Message](https://www.baeldung.com/java-kafka-custom-headers)
- [Get Last N Messages in Apache Kafka Topic](https://www.baeldung.com/java-apache-kafka-get-last-n-messages)
- [Is a Key Required as Part of Sending Messages to Kafka?](https://www.baeldung.com/java-kafka-message-key)
- [Read Data From the Beginning Using Kafka Consumer API](https://www.baeldung.com/java-kafka-consumer-api-read)
apache-poi-2/pom.xml
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@@ -1,7 +1,7 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://maven.apache.org/POM/4.0.0"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>apache-poi-2</artifactId>
<version>0.0.1-SNAPSHOT</version>
@@ -19,10 +19,15 @@
<artifactId>poi-ooxml</artifactId>
<version>${poi.version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-scratchpad</artifactId>
<version>${poi.version}</version>
</dependency>
</dependencies>
<properties>
<poi.version>5.2.0</poi.version>
<poi.version>5.2.3</poi.version>
</properties>
</project>
apache-poi-2/src/main/java/com/baeldung/poi/replacevariables/DocTextReplacer.java
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@@ -0,0 +1,38 @@
package com.baeldung.poi.replacevariables;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.poi.hwpf.HWPFDocument;
import org.apache.poi.hwpf.usermodel.Range;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
public class DocTextReplacer {
public void replaceText() throws IOException {
String filePath = getClass().getClassLoader()
.getResource("baeldung.doc")
.getPath();
try (InputStream inputStream = new FileInputStream(filePath); POIFSFileSystem fileSystem = new POIFSFileSystem(inputStream)) {
HWPFDocument doc = new HWPFDocument(fileSystem);
doc = replaceText(doc, "Baeldung", "Hello");
saveFile(filePath, doc);
doc.close();
}
}
private HWPFDocument replaceText(HWPFDocument doc, String originalText, String updatedText) {
Range range = doc.getRange();
range.replaceText(originalText, updatedText);
return doc;
}
private void saveFile(String filePath, HWPFDocument doc) throws IOException {
try (FileOutputStream out = new FileOutputStream(filePath)) {
doc.write(out);
}
}
}
apache-poi-2/src/main/java/com/baeldung/poi/replacevariables/DocxNaiveTextReplacer.java
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@@ -0,0 +1,63 @@
package com.baeldung.poi.replacevariables;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;
import org.apache.poi.xwpf.usermodel.XWPFRun;
import org.apache.poi.xwpf.usermodel.XWPFTable;
import org.apache.poi.xwpf.usermodel.XWPFTableCell;
import org.apache.poi.xwpf.usermodel.XWPFTableRow;
public class DocxNaiveTextReplacer {
public void replaceText() throws IOException {
String filePath = getClass().getClassLoader()
.getResource("baeldung-copy.docx")
.getPath();
try (InputStream inputStream = new FileInputStream(filePath)) {
XWPFDocument doc = new XWPFDocument(inputStream);
doc = replaceText(doc, "Baeldung", "Hello");
saveFile(filePath, doc);
doc.close();
}
}
private XWPFDocument replaceText(XWPFDocument doc, String originalText, String updatedText) {
replaceTextInParagraphs(doc.getParagraphs(), originalText, updatedText);
for (XWPFTable tbl : doc.getTables()) {
for (XWPFTableRow row : tbl.getRows()) {
for (XWPFTableCell cell : row.getTableCells()) {
replaceTextInParagraphs(cell.getParagraphs(), originalText, updatedText);
}
}
}
return doc;
}
private void replaceTextInParagraphs(List<XWPFParagraph> paragraphs, String originalText, String updatedText) {
paragraphs.forEach(paragraph -> replaceTextInParagraph(paragraph, originalText, updatedText));
}
private void replaceTextInParagraph(XWPFParagraph paragraph, String originalText, String updatedText) {
List<XWPFRun> runs = paragraph.getRuns();
for (XWPFRun run : runs) {
String text = run.getText(0);
if (text != null && text.contains(originalText)) {
String updatedRunText = text.replace(originalText, updatedText);
run.setText(updatedRunText, 0);
}
}
}
private void saveFile(String filePath, XWPFDocument doc) throws IOException {
try (FileOutputStream out = new FileOutputStream(filePath)) {
doc.write(out);
}
}
}
apache-poi-2/src/main/java/com/baeldung/poi/replacevariables/DocxTextReplacer.java
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@@ -0,0 +1,65 @@
package com.baeldung.poi.replacevariables;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.Objects;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;
import org.apache.poi.xwpf.usermodel.XWPFRun;
import org.apache.poi.xwpf.usermodel.XWPFTable;
import org.apache.poi.xwpf.usermodel.XWPFTableCell;
import org.apache.poi.xwpf.usermodel.XWPFTableRow;
public class DocxTextReplacer {
public void replaceText() throws IOException {
String filePath = getClass().getClassLoader()
.getResource("baeldung.docx")
.getPath();
try (InputStream inputStream = new FileInputStream(filePath)) {
XWPFDocument doc = new XWPFDocument(inputStream);
doc = replaceText(doc, "Baeldung", "Hello");
saveFile(filePath, doc);
doc.close();
}
}
private XWPFDocument replaceText(XWPFDocument doc, String originalText, String updatedText) {
replaceTextInParagraphs(doc.getParagraphs(), originalText, updatedText);
for (XWPFTable tbl : doc.getTables()) {
for (XWPFTableRow row : tbl.getRows()) {
for (XWPFTableCell cell : row.getTableCells()) {
replaceTextInParagraphs(cell.getParagraphs(), originalText, updatedText);
}
}
}
return doc;
}
private void replaceTextInParagraphs(List<XWPFParagraph> paragraphs, String originalText, String updatedText) {
paragraphs.forEach(paragraph -> replaceTextInParagraph(paragraph, originalText, updatedText));
}
private void replaceTextInParagraph(XWPFParagraph paragraph, String originalText, String updatedText) {
String paragraphText = paragraph.getParagraphText();
if (paragraphText.contains(originalText)) {
String updatedParagraphText = paragraphText.replace(originalText, updatedText);
while (paragraph.getRuns().size() > 0) {
paragraph.removeRun(0);
}
XWPFRun newRun = paragraph.createRun();
newRun.setText(updatedParagraphText);
}
}
private void saveFile(String filePath, XWPFDocument doc) throws IOException {
try (FileOutputStream out = new FileOutputStream(filePath)) {
doc.write(out);
}
}
}
apache-poi-2/src/main/resources/baeldung-copy.docx
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apache-poi-2/src/test/java/com/baeldung/poi/replacevariables/DocTextReplacerUnitTest.java
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@@ -0,0 +1,31 @@
package com.baeldung.poi.replacevariables;
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Arrays;
import org.apache.poi.hwpf.HWPFDocument;
import org.apache.poi.hwpf.extractor.WordExtractor;
import org.junit.jupiter.api.Test;
class DocTextReplacerUnitTest {
@Test
void whenReplaceText_ThenTextReplaced() throws IOException {
new DocTextReplacer().replaceText();
String filePath = getClass().getClassLoader()
.getResource("baeldung.doc")
.getPath();
try (FileInputStream fis = new FileInputStream(filePath); HWPFDocument document = new HWPFDocument(fis); WordExtractor extractor = new WordExtractor(document)) {
long occurrencesOfHello = Arrays.stream(extractor.getText()
.split("\\s+"))
.filter(s -> s.contains("Hello"))
.count();
assertEquals(5, occurrencesOfHello);
}
}
}
apache-poi-2/src/test/java/com/baeldung/poi/replacevariables/DocxNaiveTextReplacerUnitTest.java
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@@ -0,0 +1,31 @@
package com.baeldung.poi.replacevariables;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Arrays;
import org.apache.poi.xwpf.extractor.XWPFWordExtractor;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.junit.jupiter.api.Test;
class DocxNaiveTextReplacerUnitTest {
@Test
void whenReplaceText_ThenTextReplaced() throws IOException {
new DocxNaiveTextReplacer().replaceText();
String filePath = getClass().getClassLoader()
.getResource("baeldung-copy.docx")
.getPath();
try (FileInputStream fis = new FileInputStream(filePath); XWPFDocument document = new XWPFDocument(fis); XWPFWordExtractor extractor = new XWPFWordExtractor(document)) {
long occurrencesOfHello = Arrays.stream(extractor.getText()
.split("\\s+"))
.filter(s -> s.contains("Hello"))
.count();
assertTrue(occurrencesOfHello < 5);
}
}
}
apache-poi-2/src/test/java/com/baeldung/poi/replacevariables/DocxTestReplacerUnitTest.java
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@@ -0,0 +1,31 @@
package com.baeldung.poi.replacevariables;
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Arrays;
import org.apache.poi.xwpf.extractor.XWPFWordExtractor;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.junit.jupiter.api.Test;
class DocxTestReplacerUnitTest {
@Test
void whenReplaceText_ThenTextReplaced() throws IOException {
new DocxTextReplacer().replaceText();
String filePath = getClass().getClassLoader()
.getResource("baeldung.docx")
.getPath();
try (FileInputStream fis = new FileInputStream(filePath); XWPFDocument document = new XWPFDocument(fis); XWPFWordExtractor extractor = new XWPFWordExtractor(document)) {
long occurrencesOfHello = Arrays.stream(extractor.getText()
.split("\\s+"))
.filter(s -> s.contains("Hello"))
.count();
assertEquals(5, occurrencesOfHello);
}
}
}
core-java-modules/core-java-arrays-guides/README.md
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@@ -5,7 +5,7 @@ This module contains complete guides about arrays in Java
### Relevant Articles:
- [Arrays in Java: A Reference Guide](https://www.baeldung.com/java-arrays-guide)
- [Guide to the java.util.Arrays Class](https://www.baeldung.com/java-util-arrays)
- [What is [Ljava.lang.Object;?](https://www.baeldung.com/java-tostring-array)
- [What Is [Ljava.lang.Object;?](https://www.baeldung.com/java-tostring-array)
- [Guide to ArrayStoreException](https://www.baeldung.com/java-arraystoreexception)
- [Creating a Generic Array in Java](https://www.baeldung.com/java-generic-array)
- [Maximum Size of Java Arrays](https://www.baeldung.com/java-arrays-max-size)
core-java-modules/core-java-arrays-multidimensional/README.md
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This module contains articles about multidimensional arrays in Java
### Relevant Articles:
- [Multi-Dimensional Arrays In Java](https://www.baeldung.com/java-jagged-arrays)
- [Looping Diagonally Through a 2d Java Array](https://www.baeldung.com/java-loop-diagonal-array)
- [Multi-Dimensional Arrays in Java](https://www.baeldung.com/java-jagged-arrays)
- [Looping Diagonally Through a 2d Java Array](https://www.baeldung.com/java-loop-diagonal-array)
core-java-modules/core-java-arrays-operations-advanced/README.md
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- [How to Copy an Array in Java](https://www.baeldung.com/java-array-copy)
- [Arrays.deepEquals](https://www.baeldung.com/java-arrays-deepequals)
- [Find Sum and Average in a Java Array](https://www.baeldung.com/java-array-sum-average)
- [Intersection Between two Integer Arrays](https://www.baeldung.com/java-array-intersection)
- [Intersection Between Two Integer Arrays](https://www.baeldung.com/java-array-intersection)
- [Comparing Arrays in Java](https://www.baeldung.com/java-comparing-arrays)
- [Concatenate Two Arrays in Java](https://www.baeldung.com/java-concatenate-arrays)
- [Performance of System.arraycopy() vs. Arrays.copyOf()](https://www.baeldung.com/java-system-arraycopy-arrays-copyof-performance)
core-java-modules/core-java-collections-2/README.md
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- [Join and Split Arrays and Collections in Java](https://www.baeldung.com/java-join-and-split)
- [Java – Combine Multiple Collections](https://www.baeldung.com/java-combine-multiple-collections)
- [Combining Different Types of Collections in Java](https://www.baeldung.com/java-combine-collections)
- [Shuffling Collections In Java](https://www.baeldung.com/java-shuffle-collection)
- [Shuffling Collections in Java](https://www.baeldung.com/java-shuffle-collection)
- [Sorting in Java](https://www.baeldung.com/java-sorting)
- [Getting the Size of an Iterable in Java](https://www.baeldung.com/java-iterable-size)
- [Java Null-Safe Streams from Collections](https://www.baeldung.com/java-null-safe-streams-from-collections)
core-java-modules/core-java-collections-conversions/README.md
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This module contains articles about conversions among Collection types and arrays in Java.
### Relevant Articles:
- [Converting between an Array and a List in Java](https://www.baeldung.com/convert-array-to-list-and-list-to-array)
- [Converting Between an Array and a List in Java](https://www.baeldung.com/convert-array-to-list-and-list-to-array)
- [Converting Between an Array and a Set in Java](https://www.baeldung.com/convert-array-to-set-and-set-to-array)
- [Convert a Map to an Array, List or Set in Java](https://www.baeldung.com/convert-map-values-to-array-list-set)
- [Converting a List to String in Java](https://www.baeldung.com/java-list-to-string)
core-java-modules/core-java-collections-list-2/README.md
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This module contains articles about the Java List collection
### Relevant Articles:
- [Check If Two Lists are Equal in Java](https://www.baeldung.com/java-test-a-list-for-ordinality-and-equality)
- [Java 8 Streams: Find Items From One List Based On Values From Another List](https://www.baeldung.com/java-streams-find-list-items)
- [Check if Two Lists Are Equal in Java](https://www.baeldung.com/java-test-a-list-for-ordinality-and-equality)
- [Java 8 Streams: Find Items From One List Based on Values From Another List](https://www.baeldung.com/java-streams-find-list-items)
- [A Guide to the Java LinkedList](https://www.baeldung.com/java-linkedlist)
- [Java List UnsupportedOperationException](https://www.baeldung.com/java-list-unsupported-operation-exception)
- [Java List Initialization in One Line](https://www.baeldung.com/java-init-list-one-line)
core-java-modules/core-java-collections-list-5/README.md
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- [Finding All Duplicates in a List in Java](https://www.baeldung.com/java-list-find-duplicates)
- [Moving Items Around in an Arraylist](https://www.baeldung.com/java-arraylist-move-items)
- [Check if a List Contains an Element From Another List in Java](https://www.baeldung.com/java-check-elements-between-lists)
- [Array vs. List Performance in Java](https://www.baeldung.com/java-array-vs-list-performance)
- [Set Default Value for Elements in List](https://www.baeldung.com/java-list-set-default-values)
core-java-modules/core-java-collections-list-5/src/test/java/com/baeldung/java/uniqueelements/UniqueElementsInListUnitTest.java
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package com.baeldung.java.uniqueelements;
import static java.util.stream.Collectors.toList;
import static org.assertj.core.api.Assertions.assertThat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import org.junit.jupiter.api.Test;
public class UniqueElementsInListUnitTest {
// @formatter:off
private static final List<String> MY_LIST = Arrays.asList(new String[]{
"Microsoft Windows",
"Mac OS",
"GNU Linux",
"Free BSD",
"GNU Linux",
"Mac OS"});
// @formatter:on
@Test
void whenConvertToSet_thenGetExpectedResult() {
List<String> result = new ArrayList<>(new HashSet<>(MY_LIST));
assertThat(result).containsExactlyInAnyOrder("Free BSD", "Microsoft Windows", "Mac OS", "GNU Linux");
result = new ArrayList<>(new LinkedHashSet<>(MY_LIST));
assertThat(result).containsExactly("Microsoft Windows", "Mac OS", "GNU Linux", "Free BSD");
}
@Test
void whenUsingStream_thenGetExpectedResult() {
List<String> result = MY_LIST.stream()
.distinct()
.collect(toList());
assertThat(result).containsExactly("Microsoft Windows", "Mac OS", "GNU Linux", "Free BSD");
}
}
core-java-modules/core-java-collections-list/README.md
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### Relevant Articles:
- [Java – Get Random Item/Element From a List](http://www.baeldung.com/java-random-list-element)
- [Removing all Nulls from a List in Java](http://www.baeldung.com/java-remove-nulls-from-list)
- [Removing all duplicates from a List in Java](http://www.baeldung.com/java-remove-duplicates-from-list)
- [Removing All Nulls From a List in Java](https://www.baeldung.com/java-remove-nulls-from-list)
- [Removing All Duplicates From a List in Java](https://www.baeldung.com/java-remove-duplicates-from-list)
- [How to TDD a List Implementation in Java](http://www.baeldung.com/java-test-driven-list)
- [Iterating Backward Through a List](http://www.baeldung.com/java-list-iterate-backwards)
- [Remove the First Element from a List](http://www.baeldung.com/java-remove-first-element-from-list)
core-java-modules/core-java-collections-maps-2/README.md
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- [A Guide to Java HashMap](https://www.baeldung.com/java-hashmap)
- [Guide to WeakHashMap in Java](https://www.baeldung.com/java-weakhashmap)
- [Map to String Conversion in Java](https://www.baeldung.com/java-map-to-string-conversion)
- [Iterate over a Map in Java](https://www.baeldung.com/java-iterate-map)
- [Iterate Over a Map in Java](https://www.baeldung.com/java-iterate-map)
- [Merging Two Maps with Java 8](https://www.baeldung.com/java-merge-maps)
- [Sort a HashMap in Java](https://www.baeldung.com/java-hashmap-sort)
- [Finding the Highest Value in a Java Map](https://www.baeldung.com/java-find-map-max)

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