Merge branch 'master' into master

This commit is contained in:
anuragkumawat 2021-10-06 17:10:37 +05:30 committed by GitHub
commit a5101bd5ef
430 changed files with 8000 additions and 1909 deletions

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@ -1,10 +1,10 @@
package com.baeldung.algorithms.prim;
import org.junit.Test;
import java.util.ArrayList;
import java.util.List;
import org.junit.Test;
public class PrimUnitTest {
@Test

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@ -29,6 +29,7 @@ public class Graph {
stack.push(start);
while (!stack.isEmpty()) {
int current = stack.pop();
if(!isVisited[current]){
isVisited[current] = true;
visit(current);
for (int dest : adjVertices.get(current)) {
@ -37,6 +38,7 @@ public class Graph {
}
}
}
}
public void dfs(int start) {
boolean[] isVisited = new boolean[adjVertices.size()];

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@ -8,7 +8,9 @@ import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class SuffixTree {
private static final Logger LOGGER = LoggerFactory.getLogger(SuffixTree.class);
private static final String WORD_TERMINATION = "$";
private static final int POSITION_UNDEFINED = -1;
private Node root;
@ -23,7 +25,7 @@ public class SuffixTree {
}
public List<String> searchText(String pattern) {
LOGGER.info("Searching for pattern \"{}\"", pattern);
LOGGER.debug("Searching for pattern \"{}\"", pattern);
List<String> result = new ArrayList<>();
List<Node> nodes = getAllNodesInTraversePath(pattern, root, false);
@ -41,11 +43,11 @@ public class SuffixTree {
}
private void addSuffix(String suffix, int position) {
LOGGER.info(">>>>>>>>>>>> Adding new suffix {}", suffix);
LOGGER.debug(">>>>>>>>>>>> Adding new suffix {}", suffix);
List<Node> nodes = getAllNodesInTraversePath(suffix, root, true);
if (nodes.size() == 0) {
addChildNode(root, suffix, position);
LOGGER.info("{}", printTree());
LOGGER.debug("{}", printTree());
} else {
Node lastNode = nodes.remove(nodes.size() - 1);
String newText = suffix;
@ -58,7 +60,7 @@ public class SuffixTree {
newText = newText.substring(existingSuffixUptoLastNode.length());
}
extendNode(lastNode, newText, position);
LOGGER.info("{}", printTree());
LOGGER.debug("{}", printTree());
}
}

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@ -2,7 +2,6 @@ package com.baeldung.algorithms.dfs;
import java.util.List;
import com.baeldung.algorithms.dfs.Graph;
import org.junit.Test;
public class GraphUnitTest {

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@ -27,16 +27,16 @@ public class QuadTreeSearchUnitTest {
Point point = new Point(points[i][0], points[i][1]);
quadTree.addPoint(point);
}
LOGGER.info("\n" + quadTree.printTree(""));
LOGGER.info("==============================================");
LOGGER.debug("\n" + quadTree.printTree(""));
LOGGER.debug("==============================================");
}
@Test
public void givenQuadTree_whenSearchingForRange_thenReturn1MatchingItem() {
Region searchArea = new Region(200, 200, 250, 250);
List<Point> result = quadTree.search(searchArea, null, "");
LOGGER.info(result.toString());
LOGGER.info(quadTree.printSearchTraversePath());
LOGGER.debug(result.toString());
LOGGER.debug(quadTree.printSearchTraversePath());
Assert.assertEquals(1, result.size());
Assert.assertArrayEquals(new float[] { 245, 238 },
@ -47,8 +47,8 @@ public class QuadTreeSearchUnitTest {
public void givenQuadTree_whenSearchingForRange_thenReturn2MatchingItems() {
Region searchArea = new Region(0, 0, 100, 100);
List<Point> result = quadTree.search(searchArea, null, "");
LOGGER.info(result.toString());
LOGGER.info(quadTree.printSearchTraversePath());
LOGGER.debug(result.toString());
LOGGER.debug(quadTree.printSearchTraversePath());
Assert.assertEquals(2, result.size());
Assert.assertArrayEquals(new float[] { 21, 25 },

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@ -10,7 +10,6 @@
<groupId>com.baeldung</groupId>
<version>1.0.0-SNAPSHOT</version>
<artifactId>annotations</artifactId>
<relativePath>../</relativePath>
</parent>
<dependencies>

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@ -10,7 +10,6 @@
<groupId>com.baeldung</groupId>
<artifactId>annotations</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

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@ -3,7 +3,7 @@
This module contains articles about Apache Kafka.
### Relevant articles
- [Kafka Streams vs Kafka Consumer](https://www.baeldung.com/java-kafka-streams-vs-kafka-consumer)
- [Kafka Streams vs. Kafka Consumer](https://www.baeldung.com/java-kafka-streams-vs-kafka-consumer)
- [Kafka Topic Creation Using Java](https://www.baeldung.com/kafka-topic-creation)
- [Using Kafka MockConsumer](https://www.baeldung.com/kafka-mockconsumer)
- [Using Kafka MockProducer](https://www.baeldung.com/kafka-mockproducer)

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@ -161,6 +161,12 @@
<artifactId>spark-cassandra-connector-java_2.11</artifactId>
<version>${com.datastax.spark.spark-cassandra-connector-java.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
</dependencies>
<properties>
@ -175,6 +181,7 @@
<graphframes.version>0.8.1-spark3.0-s_2.12</graphframes.version>
<com.datastax.spark.spark-cassandra-connector.version>2.5.2</com.datastax.spark.spark-cassandra-connector.version>
<com.datastax.spark.spark-cassandra-connector-java.version>1.6.0-M1</com.datastax.spark.spark-cassandra-connector-java.version>
<lombok.version>1.18.20</lombok.version>
</properties>
</project>

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@ -0,0 +1,15 @@
package com.baeldung.kafka.dto;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class MessageDto {
private String message;
private String version;
}

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@ -0,0 +1,35 @@
package com.baeldung.kafka.serdes;
import com.baeldung.kafka.dto.MessageDto;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.kafka.common.errors.SerializationException;
import org.apache.kafka.common.serialization.Deserializer;
import java.util.Map;
public class CustomDeserializer implements Deserializer<MessageDto> {
private ObjectMapper objectMapper = new ObjectMapper();
@Override
public void configure(Map<String, ?> configs, boolean isKey) {
}
@Override
public MessageDto deserialize(String topic, byte[] data) {
try {
if (data == null){
System.out.println("Null received at deserializing");
return null;
}
System.out.println("Deserializing...");
return objectMapper.readValue(new String(data, "UTF-8"), MessageDto.class);
} catch (Exception e) {
throw new SerializationException("Error when deserializing byte[] to MessageDto");
}
}
@Override
public void close() {
}
}

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@ -0,0 +1,34 @@
package com.baeldung.kafka.serdes;
import com.baeldung.kafka.dto.MessageDto;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.kafka.common.errors.SerializationException;
import org.apache.kafka.common.serialization.Serializer;
import java.util.Map;
public class CustomSerializer implements Serializer<MessageDto> {
private final ObjectMapper objectMapper = new ObjectMapper();
@Override
public void configure(Map<String, ?> configs, boolean isKey) {
}
@Override
public byte[] serialize(String topic, MessageDto data) {
try {
if (data == null){
System.out.println("Null received at serializing");
return null;
}
System.out.println("Serializing...");
return objectMapper.writeValueAsBytes(data);
} catch (Exception e) {
throw new SerializationException("Error when serializing MessageDto to byte[]");
}
}
@Override
public void close() {
}
}

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@ -0,0 +1,92 @@
package com.baeldung.kafka.serdes;
import com.baeldung.kafka.dto.MessageDto;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.junit.Before;
import org.junit.ClassRule;
import org.junit.Test;
import org.testcontainers.containers.KafkaContainer;
import org.testcontainers.utility.DockerImageName;
import java.time.Duration;
import java.util.Arrays;
import java.util.Properties;
import java.util.concurrent.atomic.AtomicReference;
import static org.junit.Assert.assertEquals;
public class KafkaSerDesLiveTest {
private static final String CONSUMER_APP_ID = "consumer_id";
private static final String CONSUMER_GROUP_ID = "group_id";
@ClassRule
public static KafkaContainer kafka = new KafkaContainer(DockerImageName.parse("confluentinc/cp-kafka:5.4.3"));
private final String TOPIC = "mytopic";
private static KafkaConsumer<String, MessageDto> createKafkaConsumer() {
Properties props = new Properties();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, kafka.getBootstrapServers());
props.put(ConsumerConfig.CLIENT_ID_CONFIG, CONSUMER_APP_ID);
props.put(ConsumerConfig.GROUP_ID_CONFIG, CONSUMER_GROUP_ID);
props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "com.baeldung.kafka.serdes.CustomDeserializer");
return new KafkaConsumer<>(props);
}
private static KafkaProducer<String, MessageDto> createKafkaProducer() {
Properties props = new Properties();
props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, kafka.getBootstrapServers());
props.put(ProducerConfig.CLIENT_ID_CONFIG, CONSUMER_APP_ID);
props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, "com.baeldung.kafka.serdes.CustomSerializer");
return new KafkaProducer(props);
}
@Before
public void setUp() {
}
@Test
public void givenKafkaClientShouldSerializeAndDeserialize() throws InterruptedException {
MessageDto msgProd = MessageDto.builder().message("test").version("1.0").build();
KafkaProducer<String, MessageDto> producer = createKafkaProducer();
producer.send(new ProducerRecord<String, MessageDto>(TOPIC, "1", msgProd));
System.out.println("Message sent " + msgProd);
producer.close();
Thread.sleep(2000);
AtomicReference<MessageDto> msgCons = new AtomicReference<>();
KafkaConsumer<String, MessageDto> consumer = createKafkaConsumer();
consumer.subscribe(Arrays.asList(TOPIC));
ConsumerRecords<String, MessageDto> records = consumer.poll(Duration.ofSeconds(1));
records.forEach(record -> {
msgCons.set(record.value());
System.out.println("Message received " + record.value());
});
consumer.close();
assertEquals(msgProd, msgCons.get());
}
}

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@ -133,6 +133,11 @@
<artifactId>jackson-databind</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>com.jayway.awaitility</groupId>
<artifactId>awaitility</artifactId>
@ -196,7 +201,6 @@
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<avro.version>1.8.2</avro.version>
<slf4j.version>1.7.25</slf4j.version>
<beam.version>2.19.0</beam.version>
<assertj.version>3.9.0</assertj.version>
<bval.version>1.1.2</bval.version>

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@ -0,0 +1,18 @@
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
</Console>
</Appenders>
<Loggers>
<Logger name="org.apache.meecrowave" level="warn">
<AppenderRef ref="Console"/>
</Logger>
<Root level="info">
<AppenderRef ref="Console"/>
</Root>
</Loggers>
</Configuration>

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@ -10,7 +10,6 @@ import com.baeldung.apache.beam.intro.WordCount;
public class WordCountUnitTest {
@Test
// @Ignore
public void givenInputFile_whenWordCountRuns_thenJobFinishWithoutError() {
boolean jobDone = WordCount.wordCount("src/test/resources/wordcount.txt", "target/output");
assertTrue(jobDone);

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@ -0,0 +1,42 @@
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Set everything to be logged to the console
log4j.rootCategory=WARN, console
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.target=System.err
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%d{yy/MM/dd HH:mm:ss} %p %c{1}: %m%n
# Set the default spark-shell log level to WARN. When running the spark-shell, the
# log level for this class is used to overwrite the root logger's log level, so that
# the user can have different defaults for the shell and regular Spark apps.
log4j.logger.org.apache.spark.repl.Main=WARN
# Settings to quiet third party logs that are too verbose
log4j.logger.org.spark_project.jetty=WARN
log4j.logger.org.spark_project.jetty.util.component.AbstractLifeCycle=ERROR
log4j.logger.org.apache.spark.repl.SparkIMain$exprTyper=INFO
log4j.logger.org.apache.spark.repl.SparkILoop$SparkILoopInterpreter=INFO
# SPARK-9183: Settings to avoid annoying messages when looking up nonexistent UDFs in SparkSQL with Hive support
log4j.logger.org.apache.hadoop.hive.metastore.RetryingHMSHandler=FATAL
log4j.logger.org.apache.hadoop.hive.ql.exec.FunctionRegistry=ERROR
# Parquet related logging
log4j.logger.org.apache.parquet.CorruptStatistics=ERROR
log4j.logger.parquet.CorruptStatistics=ERROR

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@ -32,7 +32,6 @@
<!-- Uncomment this to add support for file uploads: -->
<!-- <dependency> <groupId>org.apache.tapestry</groupId> <artifactId>tapestry-upload</artifactId>
<version>${tapestry-release-version}</version> </dependency> -->
<!-- A dependency on either JUnit or TestNG is required, or the surefire plugin (which runs the
tests) will fail, preventing Maven from packaging the WAR. Tapestry includes a large number of testing
facilities designed for use with TestNG (http://testng.org/), so it's recommended. -->
@ -110,8 +109,6 @@
</plugins>
</build>
<reporting />
<repositories>
<repository>
<id>jboss</id>

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@ -29,7 +29,7 @@
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>${org.slf4j.slf4j-simple.version}</version>
<version>${org.slf4j.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
@ -61,7 +61,6 @@
<properties>
<thrift.version>0.10.0</thrift.version>
<maven-thrift.version>0.1.11</maven-thrift.version>
<org.slf4j.slf4j-simple.version>1.7.12</org.slf4j.slf4j-simple.version>
<build-helper-maven-plugin.version>3.0.0</build-helper-maven-plugin.version>
</properties>

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@ -6,7 +6,7 @@ This module contains articles about Amazon Web Services (AWS)
- [AWS Lambda Using DynamoDB With Java](https://www.baeldung.com/aws-lambda-dynamodb-java)
- [AWS S3 with Java](https://www.baeldung.com/aws-s3-java)
- [AWS Lambda With Java](https://www.baeldung.com/java-aws-lambda)
- [A Basic AWS Lambda Example With Java](https://www.baeldung.com/java-aws-lambda)
- [Managing EC2 Instances in Java](https://www.baeldung.com/ec2-java)
- [Multipart Uploads in Amazon S3 with Java](https://www.baeldung.com/aws-s3-multipart-upload)
- [Integration Testing with a Local DynamoDB Instance](https://www.baeldung.com/dynamodb-local-integration-tests)

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@ -6,3 +6,4 @@ This module contains articles about Axon
- [A Guide to the Axon Framework](https://www.baeldung.com/axon-cqrs-event-sourcing)
- [Multi-Entity Aggregates in Axon](https://www.baeldung.com/java-axon-multi-entity-aggregates)
- [Snapshotting Aggregates in Axon](https://www.baeldung.com/axon-snapshotting-aggregates)

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@ -0,0 +1,18 @@
package com.baeldung.axon;
import org.axonframework.eventsourcing.EventCountSnapshotTriggerDefinition;
import org.axonframework.eventsourcing.SnapshotTriggerDefinition;
import org.axonframework.eventsourcing.Snapshotter;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class OrderApplicationConfiguration {
@Bean
public SnapshotTriggerDefinition orderAggregateSnapshotTriggerDefinition(Snapshotter snapshotter,
@Value("${axon.aggregate.order.snapshot-threshold:250}") int threshold) {
return new EventCountSnapshotTriggerDefinition(snapshotter, threshold);
}
}

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@ -23,7 +23,7 @@ import java.util.Map;
import static org.axonframework.modelling.command.AggregateLifecycle.apply;
@Aggregate
@Aggregate(snapshotTriggerDefinition = "orderAggregateSnapshotTriggerDefinition")
public class OrderAggregate {
@AggregateIdentifier

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@ -166,7 +166,6 @@
<hsqldb.version>2.4.0</hsqldb.version>
<spock-core.version>1.1-groovy-2.4</spock-core.version>
<groovy-wslite.version>1.1.3</groovy-wslite.version>
<logback.version>1.2.3</logback.version>
<groovy.version>2.5.7</groovy.version>
<assembly.plugin.version>3.1.0</assembly.plugin.version>
<compiler.plugin.version>3.8.0</compiler.plugin.version>

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@ -8,3 +8,4 @@ This module contains articles about Java 11 core features
- [Guide to Java 8s Collectors](https://www.baeldung.com/java-8-collectors)
- [New Features in Java 11](https://www.baeldung.com/java-11-new-features)
- [Getting the Java Version at Runtime](https://www.baeldung.com/get-java-version-runtime)
- [Invoking a SOAP Web Service in Java](https://www.baeldung.com/java-soap-web-service)

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@ -1,3 +1,7 @@
### Relevant articles:
- [Collect a Java Stream to an Immutable Collection](https://www.baeldung.com/java-stream-immutable-collection)
- [Guide to mapMulti in Stream API](https://www.baeldung.com/java-mapmulti)
- [Collecting Stream Elements into a List in Java](https://www.baeldung.com/java-stream-to-list-collecting)
- [New Features in Java 16](https://www.baeldung.com/java-16-new-features)
- [Guide to Java 8 groupingBy Collector](https://www.baeldung.com/java-groupingby-collector)

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@ -28,6 +28,18 @@
<artifactId>commons-lang3</artifactId>
<version>3.12.0</version>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
@ -37,17 +49,38 @@
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<release>${maven.compiler.release}</release>
<compilerArgs>--enable-preview</compilerArgs>
<source>${maven.compiler.source.version}</source>
<target>${maven.compiler.target.version}</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${surefire.plugin.version}</version>
<configuration>
<argLine>--enable-preview</argLine>
<forkCount>1</forkCount>
</configuration>
<dependencies>
<dependency>
<groupId>org.apache.maven.surefire</groupId>
<artifactId>surefire-api</artifactId>
<version>${surefire.plugin.version}</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
<properties>
<maven.compiler.source.version>16</maven.compiler.source.version>
<maven.compiler.target.version>16</maven.compiler.target.version>
<assertj.version>3.6.1</assertj.version>
<maven.compiler.release>16</maven.compiler.release>
<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
<surefire.plugin.version>3.0.0-M5</surefire.plugin.version>
<assertj.version>3.17.2</assertj.version>
</properties>
</project>

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@ -0,0 +1,7 @@
package com.baeldung.features;
interface HelloWorld {
default String hello() {
return "world";
}
}

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@ -0,0 +1,9 @@
package com.baeldung.features;
import com.baeldung.features.record.Book;
public class OuterClass {
class InnerClass {
Book book = new Book("Title", "author", "isbn");
}
}

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@ -0,0 +1,23 @@
package com.baeldung.features;
import jdk.incubator.vector.IntVector;
public class VectorExample {
public int[] scalarComputation(int[] a, int[] b) {
var c = new int[a.length];
for (int i = 0; i < a.length; i++) {
c[i] = a[i] * b[i];
}
return c;
}
public int[] vectorComputation(int[] a, int[] b) {
var c = new int[a.length];
var vectorA = IntVector.fromArray(IntVector.SPECIES_128, a, 0);
var vectorB = IntVector.fromArray(IntVector.SPECIES_128, b, 0);
var vectorC = vectorA.mul(vectorB);
vectorC.intoArray(c, 0);
return c;
}
}

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@ -0,0 +1,44 @@
package com.baeldung.features.model;
import java.util.Objects;
public final class Book {
private final String title;
private final String author;
private final String isbn;
public Book(String title, String author, String isbn) {
this.title = title;
this.author = author;
this.isbn = isbn;
}
public String getTitle() {
return title;
}
public String getAuthor() {
return author;
}
public String getIsbn() {
return isbn;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Book book = (Book) o;
return Objects.equals(title, book.title) && Objects.equals(author, book.author) && Objects.equals(isbn, book.isbn);
}
@Override
public int hashCode() {
return Objects.hash(title, author, isbn);
}
}

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@ -0,0 +1,4 @@
package com.baeldung.features.record;
public record Book(String title, String author, String isbn) {
}

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@ -0,0 +1,4 @@
package com.baeldung.features.sealed;
public sealed interface JungleAnimal permits Monkey, Snake {
}

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@ -0,0 +1,4 @@
package com.baeldung.features.sealed;
public final class Monkey implements JungleAnimal {
}

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@ -0,0 +1,13 @@
package com.baeldung.features.sealed;
public class Sealed {
public static void main(String... args) {
JungleAnimal j = new Monkey();
if (j instanceof Monkey m) {
// do logic
} else if (j instanceof Snake s) {
// do logic
}
}
}

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@ -0,0 +1,4 @@
package com.baeldung.features.sealed;
public non-sealed class Snake implements JungleAnimal {
}

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@ -0,0 +1,4 @@
module core.java {
requires jdk.incubator.vector;
requires org.apache.commons.lang3;
}

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@ -0,0 +1,24 @@
package com.baeldung.features;
import org.junit.jupiter.api.Test;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import static org.assertj.core.api.Assertions.assertThat;
public class DayPeriodSupportUnitTest {
@Test
public void givenASpecificTime_whenFormattingUsingTheBSymbol_thenExpectVerbosePeriodOfDay() {
LocalTime date = LocalTime.parse("15:25:08.690791");
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("h B");
assertThat(date.format(formatter)).isEqualTo("3 in the afternoon");
formatter = DateTimeFormatter.ofPattern("h BBBB");
assertThat(date.format(formatter)).isEqualTo("3 in the afternoon");
formatter = DateTimeFormatter.ofPattern("h BBBBB");
assertThat(date.format(formatter)).isEqualTo("3 in the afternoon");
}
}

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@ -0,0 +1,28 @@
package com.baeldung.features;
import org.junit.jupiter.api.Test;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import static java.lang.ClassLoader.getSystemClassLoader;
import static org.assertj.core.api.Assertions.assertThat;
class HelloWorldUnitTest {
@Test
public void givenAnInterfaceWithDefaulMethod_whenCreatingProxyInstance_thenCanInvokeDefaultMethod() throws Exception {
Object proxy = Proxy.newProxyInstance(getSystemClassLoader(), new Class<?>[] { HelloWorld.class },
(prox, method, args) -> {
if (method.isDefault()) {
return InvocationHandler.invokeDefault(prox, method, args);
}
return method.invoke(prox, args);
}
);
Method method = proxy.getClass().getMethod("hello");
assertThat(method.invoke(proxy)).isEqualTo("world");
}
}

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@ -0,0 +1,18 @@
package com.baeldung.features;
import org.junit.jupiter.api.Test;
import static org.assertj.core.api.Assertions.assertThat;
public class InstanceOfPatternMatchingUnitTest {
@Test
void givenTheNewPatternMatchingAbility_whenComparingAgainstTheTradiationalApproach_thenBothVariablesAreEqual() {
Object obj = "TEST";
if (obj instanceof String a) {
String b = (String) obj;
assertThat(a).isEqualTo(b);
}
}
}

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@ -0,0 +1,20 @@
package com.baeldung.features;
import org.junit.jupiter.api.Test;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import static org.assertj.core.api.Assertions.assertThat;
public class StreamToListUnitTest {
@Test
void givenAStream_whenCreatingANewListFromStream_thenCollectorsOrInbuiltFunctionAreEquivalent() {
List<String> integersAsString = Arrays.asList("1", "2", "3");
List<Integer> ints = integersAsString.stream().map(Integer::parseInt).collect(Collectors.toList());
List<Integer> intsEquivalent = integersAsString.stream().map(Integer::parseInt).toList();
assertThat(ints).isEqualTo(intsEquivalent);
}
}

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@ -0,0 +1,21 @@
package com.baeldung.features;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertArrayEquals;
class VectorExampleUnitTest {
@Test
void givenAScalarComputation_whenCalculatingUsingVectorAPI_thenResultIsSameAsPreviousMethodOfComputation() {
VectorExample objectUnderTest = new VectorExample();
int[] a = {1, 2, 3, 4};
int[] b = {5, 6, 7, 8};
int[] result = objectUnderTest.scalarComputation(a, b);
int[] result2 = objectUnderTest.vectorComputation(a, b);
assertArrayEquals(result, result2);
}
}

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@ -0,0 +1,128 @@
package com.baeldung.streams;
import java.util.List;
import java.util.Locale;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
public class StreamToListComparisonWithCollectorsToListUnitTest {
@Test
public void whenAddingtoCollectToList_thenSuccess() {
List<String> result = Stream.of(Locale.getISOCountries())
.collect(Collectors.toList());
Assertions.assertDoesNotThrow(() -> {
result.add("test");
});
}
@Test
public void whenSortingtoCollectToList_thenSuccess() {
List<String> result = Stream.of(Locale.getISOCountries())
.collect(Collectors.toList());
Assertions.assertDoesNotThrow(() -> {
result.sort(String::compareToIgnoreCase);
});
}
@Test
public void whenAddingCollectUnmodifiableToList_thenException() {
List<String> result = Stream.of(Locale.getISOCountries())
.collect(Collectors.toUnmodifiableList());
Assertions.assertThrows(UnsupportedOperationException.class, () -> {
result.add("test");
});
}
@Test
public void whenSortingCollectUnmodifiableToList_thenSortException() {
List<String> result = Stream.of(Locale.getISOCountries())
.collect(Collectors.toUnmodifiableList());
Assertions.assertThrows(UnsupportedOperationException.class, () -> {
result.sort(String::compareToIgnoreCase);
});
}
@Test
public void whenAddingStreamToList_thenException() {
List<String> result = Stream.of(Locale.getISOCountries())
.toList();
Assertions.assertThrows(UnsupportedOperationException.class, () -> {
result.add("test");
});
}
@Test
public void whenSortingStreamToList_thenException() {
List<String> result = Stream.of(Locale.getISOCountries())
.toList();
Assertions.assertThrows(UnsupportedOperationException.class, () -> {
result.sort(String::compareToIgnoreCase);
});
}
@Test
public void whenComparingStreamToList_withCollectToList_thenEqual() {
List<String> streamToList = Stream.of(Locale.getISOCountries())
.toList();
List<String> collectToList = Stream.of(Locale.getISOCountries())
.collect(Collectors.toList());
Assertions.assertEquals(streamToList, collectToList);
}
@Test
public void whenComparingStreamToList_withUnmodifiedCollectToList_thenEqual() {
List<String> streamToList = Stream.of(Locale.getISOCountries())
.toList();
List<String> collectToUnmodifiableList = Stream.of(Locale.getISOCountries())
.collect(Collectors.toUnmodifiableList());
Assertions.assertEquals(streamToList, collectToUnmodifiableList);
}
@Test
public void whenNullCollectorsToList_thenSuccess() {
Assertions.assertDoesNotThrow(() -> {
Stream.of(null, null)
.collect(Collectors.toList());
});
}
@Test
public void whenNullCollectorsUnmodifiableToList_thenException() {
Assertions.assertThrows(NullPointerException.class, () -> {
Stream.of(null, null)
.collect(Collectors.toUnmodifiableList());
});
}
@Test
public void whenNullStreamToList_thenSuccess() {
Assertions.assertDoesNotThrow(() -> {
Stream.of(null, null)
.toList();
});
}
}

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@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

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@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

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@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

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@ -4,7 +4,6 @@ This module contains articles about Java 8 core features
### Relevant Articles:
- [New Features in Java 8](https://www.baeldung.com/java-8-new-features)
- [Guide to Java 8 groupingBy Collector](https://www.baeldung.com/java-groupingby-collector)
- [Strategy Design Pattern in Java 8](https://www.baeldung.com/java-strategy-pattern)
- [Guide to Java 8 Comparator.comparing()](https://www.baeldung.com/java-8-comparator-comparing)
- [Guide to the Java 8 forEach](https://www.baeldung.com/foreach-java)

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@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

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@ -1,36 +0,0 @@
package com.baeldung.java_8_features.groupingby;
public class BlogPost {
private String title;
private String author;
private BlogPostType type;
private int likes;
public BlogPost(String title, String author, BlogPostType type, int likes) {
this.title = title;
this.author = author;
this.type = type;
this.likes = likes;
}
public String getTitle() {
return title;
}
public String getAuthor() {
return author;
}
public BlogPostType getType() {
return type;
}
public int getLikes() {
return likes;
}
@Override
public String toString() {
return "BlogPost{" + "title='" + title + '\'' + ", type=" + type + ", likes=" + likes + '}';
}
}

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@ -1,5 +0,0 @@
package com.baeldung.java_8_features.groupingby;
public enum BlogPostType {
NEWS, REVIEW, GUIDE
}

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@ -1,41 +0,0 @@
package com.baeldung.java_8_features.groupingby;
import java.util.Objects;
public class Tuple {
private final BlogPostType type;
private final String author;
public Tuple(BlogPostType type, String author) {
this.type = type;
this.author = author;
}
public BlogPostType getType() {
return type;
}
public String getAuthor() {
return author;
}
@Override
public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
Tuple tuple = (Tuple) o;
return type == tuple.type && author.equals(tuple.author);
}
@Override
public int hashCode() {
return Objects.hash(type, author);
}
@Override
public String toString() {
return "Tuple{" + "type=" + type + ", author='" + author + '\'' + '}';
}
}

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@ -1,215 +0,0 @@
package com.baeldung.java_8_features.groupingby;
import static java.util.Comparator.comparingInt;
import static java.util.stream.Collectors.averagingInt;
import static java.util.stream.Collectors.counting;
import static java.util.stream.Collectors.groupingBy;
import static java.util.stream.Collectors.groupingByConcurrent;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.mapping;
import static java.util.stream.Collectors.maxBy;
import static java.util.stream.Collectors.summarizingInt;
import static java.util.stream.Collectors.summingInt;
import static java.util.stream.Collectors.toList;
import static java.util.stream.Collectors.toSet;
import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import java.util.Arrays;
import java.util.EnumMap;
import java.util.IntSummaryStatistics;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.ConcurrentMap;
import org.junit.Test;
public class Java8GroupingByCollectorUnitTest {
private static final List<BlogPost> posts = Arrays.asList(new BlogPost("News item 1", "Author 1", BlogPostType.NEWS, 15), new BlogPost("Tech review 1", "Author 2", BlogPostType.REVIEW, 5),
new BlogPost("Programming guide", "Author 1", BlogPostType.GUIDE, 20), new BlogPost("News item 2", "Author 2", BlogPostType.NEWS, 35), new BlogPost("Tech review 2", "Author 1", BlogPostType.REVIEW, 15));
@Test
public void givenAListOfPosts_whenGroupedByType_thenGetAMapBetweenTypeAndPosts() {
Map<BlogPostType, List<BlogPost>> postsPerType = posts.stream()
.collect(groupingBy(BlogPost::getType));
assertEquals(2, postsPerType.get(BlogPostType.NEWS)
.size());
assertEquals(1, postsPerType.get(BlogPostType.GUIDE)
.size());
assertEquals(2, postsPerType.get(BlogPostType.REVIEW)
.size());
}
@Test
public void givenAListOfPosts_whenGroupedByTypeAndTheirTitlesAreJoinedInAString_thenGetAMapBetweenTypeAndCsvTitles() {
Map<BlogPostType, String> postsPerType = posts.stream()
.collect(groupingBy(BlogPost::getType, mapping(BlogPost::getTitle, joining(", ", "Post titles: [", "]"))));
assertEquals("Post titles: [News item 1, News item 2]", postsPerType.get(BlogPostType.NEWS));
assertEquals("Post titles: [Programming guide]", postsPerType.get(BlogPostType.GUIDE));
assertEquals("Post titles: [Tech review 1, Tech review 2]", postsPerType.get(BlogPostType.REVIEW));
}
@Test
public void givenAListOfPosts_whenGroupedByTypeAndSumTheLikes_thenGetAMapBetweenTypeAndPostLikes() {
Map<BlogPostType, Integer> likesPerType = posts.stream()
.collect(groupingBy(BlogPost::getType, summingInt(BlogPost::getLikes)));
assertEquals(50, likesPerType.get(BlogPostType.NEWS)
.intValue());
assertEquals(20, likesPerType.get(BlogPostType.REVIEW)
.intValue());
assertEquals(20, likesPerType.get(BlogPostType.GUIDE)
.intValue());
}
@Test
public void givenAListOfPosts_whenGroupedByTypeInAnEnumMap_thenGetAnEnumMapBetweenTypeAndPosts() {
EnumMap<BlogPostType, List<BlogPost>> postsPerType = posts.stream()
.collect(groupingBy(BlogPost::getType, () -> new EnumMap<>(BlogPostType.class), toList()));
assertEquals(2, postsPerType.get(BlogPostType.NEWS)
.size());
assertEquals(1, postsPerType.get(BlogPostType.GUIDE)
.size());
assertEquals(2, postsPerType.get(BlogPostType.REVIEW)
.size());
}
@Test
public void givenAListOfPosts_whenGroupedByTypeInSets_thenGetAMapBetweenTypesAndSetsOfPosts() {
Map<BlogPostType, Set<BlogPost>> postsPerType = posts.stream()
.collect(groupingBy(BlogPost::getType, toSet()));
assertEquals(2, postsPerType.get(BlogPostType.NEWS)
.size());
assertEquals(1, postsPerType.get(BlogPostType.GUIDE)
.size());
assertEquals(2, postsPerType.get(BlogPostType.REVIEW)
.size());
}
@Test
public void givenAListOfPosts_whenGroupedByTypeConcurrently_thenGetAMapBetweenTypeAndPosts() {
ConcurrentMap<BlogPostType, List<BlogPost>> postsPerType = posts.parallelStream()
.collect(groupingByConcurrent(BlogPost::getType));
assertEquals(2, postsPerType.get(BlogPostType.NEWS)
.size());
assertEquals(1, postsPerType.get(BlogPostType.GUIDE)
.size());
assertEquals(2, postsPerType.get(BlogPostType.REVIEW)
.size());
}
@Test
public void givenAListOfPosts_whenGroupedByTypeAndAveragingLikes_thenGetAMapBetweenTypeAndAverageNumberOfLikes() {
Map<BlogPostType, Double> averageLikesPerType = posts.stream()
.collect(groupingBy(BlogPost::getType, averagingInt(BlogPost::getLikes)));
assertEquals(25, averageLikesPerType.get(BlogPostType.NEWS)
.intValue());
assertEquals(20, averageLikesPerType.get(BlogPostType.GUIDE)
.intValue());
assertEquals(10, averageLikesPerType.get(BlogPostType.REVIEW)
.intValue());
}
@Test
public void givenAListOfPosts_whenGroupedByTypeAndCounted_thenGetAMapBetweenTypeAndNumberOfPosts() {
Map<BlogPostType, Long> numberOfPostsPerType = posts.stream()
.collect(groupingBy(BlogPost::getType, counting()));
assertEquals(2, numberOfPostsPerType.get(BlogPostType.NEWS)
.intValue());
assertEquals(1, numberOfPostsPerType.get(BlogPostType.GUIDE)
.intValue());
assertEquals(2, numberOfPostsPerType.get(BlogPostType.REVIEW)
.intValue());
}
@Test
public void givenAListOfPosts_whenGroupedByTypeAndMaxingLikes_thenGetAMapBetweenTypeAndMaximumNumberOfLikes() {
Map<BlogPostType, Optional<BlogPost>> maxLikesPerPostType = posts.stream()
.collect(groupingBy(BlogPost::getType, maxBy(comparingInt(BlogPost::getLikes))));
assertTrue(maxLikesPerPostType.get(BlogPostType.NEWS)
.isPresent());
assertEquals(35, maxLikesPerPostType.get(BlogPostType.NEWS)
.get()
.getLikes());
assertTrue(maxLikesPerPostType.get(BlogPostType.GUIDE)
.isPresent());
assertEquals(20, maxLikesPerPostType.get(BlogPostType.GUIDE)
.get()
.getLikes());
assertTrue(maxLikesPerPostType.get(BlogPostType.REVIEW)
.isPresent());
assertEquals(15, maxLikesPerPostType.get(BlogPostType.REVIEW)
.get()
.getLikes());
}
@Test
public void givenAListOfPosts_whenGroupedByAuthorAndThenByType_thenGetAMapBetweenAuthorAndMapsBetweenTypeAndBlogPosts() {
Map<String, Map<BlogPostType, List<BlogPost>>> map = posts.stream()
.collect(groupingBy(BlogPost::getAuthor, groupingBy(BlogPost::getType)));
assertEquals(1, map.get("Author 1")
.get(BlogPostType.NEWS)
.size());
assertEquals(1, map.get("Author 1")
.get(BlogPostType.GUIDE)
.size());
assertEquals(1, map.get("Author 1")
.get(BlogPostType.REVIEW)
.size());
assertEquals(1, map.get("Author 2")
.get(BlogPostType.NEWS)
.size());
assertEquals(1, map.get("Author 2")
.get(BlogPostType.REVIEW)
.size());
assertNull(map.get("Author 2")
.get(BlogPostType.GUIDE));
}
@Test
public void givenAListOfPosts_whenGroupedByTypeAndSummarizingLikes_thenGetAMapBetweenTypeAndSummary() {
Map<BlogPostType, IntSummaryStatistics> likeStatisticsPerType = posts.stream()
.collect(groupingBy(BlogPost::getType, summarizingInt(BlogPost::getLikes)));
IntSummaryStatistics newsLikeStatistics = likeStatisticsPerType.get(BlogPostType.NEWS);
assertEquals(2, newsLikeStatistics.getCount());
assertEquals(50, newsLikeStatistics.getSum());
assertEquals(25.0, newsLikeStatistics.getAverage(), 0.001);
assertEquals(35, newsLikeStatistics.getMax());
assertEquals(15, newsLikeStatistics.getMin());
}
@Test
public void givenAListOfPosts_whenGroupedByComplexMapKeyType_thenGetAMapBetweenTupleAndList() {
Map<Tuple, List<BlogPost>> postsPerTypeAndAuthor = posts.stream()
.collect(groupingBy(post -> new Tuple(post.getType(), post.getAuthor())));
List<BlogPost> result = postsPerTypeAndAuthor.get(new Tuple(BlogPostType.GUIDE, "Author 1"));
assertThat(result.size()).isEqualTo(1);
BlogPost blogPost = result.get(0);
assertThat(blogPost.getTitle()).isEqualTo("Programming guide");
assertThat(blogPost.getType()).isEqualTo(BlogPostType.GUIDE);
assertThat(blogPost.getAuthor()).isEqualTo("Author 1");
}
}

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@ -6,7 +6,6 @@ This module contains articles about core Java features that have been introduced
- [New Features in Java 9](https://www.baeldung.com/new-java-9)
- [Java 9 Variable Handles Demystified](http://www.baeldung.com/java-variable-handles)
- [Exploring the New HTTP Client in Java 9 and 11](http://www.baeldung.com/java-9-http-client)
- [Multi-Release Jar Files](https://www.baeldung.com/java-multi-release-jar)
- [Ahead of Time Compilation (AoT)](https://www.baeldung.com/ahead-of-time-compilation)
- [Introduction to Java 9 StackWalking API](https://www.baeldung.com/java-9-stackwalking-api)

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@ -1,84 +0,0 @@
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package com.baeldung.httpclient;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Collectors;
import jdk.incubator.http.HttpClient;
import jdk.incubator.http.HttpRequest;
import jdk.incubator.http.HttpRequest.BodyProcessor;
import jdk.incubator.http.HttpResponse;
import jdk.incubator.http.HttpResponse.BodyHandler;
/**
*
* @author pkaria
*/
public class HttpClientExample {
public static void main(String[] args) throws Exception {
httpGetRequest();
httpPostRequest();
asynchronousRequest();
asynchronousMultipleRequests();
}
public static void httpGetRequest() throws URISyntaxException, IOException, InterruptedException {
HttpClient client = HttpClient.newHttpClient();
URI httpURI = new URI("http://jsonplaceholder.typicode.com/posts/1");
HttpRequest request = HttpRequest.newBuilder(httpURI).GET()
.headers("Accept-Enconding", "gzip, deflate").build();
HttpResponse<String> response = client.send(request, HttpResponse.BodyHandler.asString());
String responseBody = response.body();
int responseStatusCode = response.statusCode();
System.out.println(responseBody);
}
public static void httpPostRequest() throws URISyntaxException, IOException, InterruptedException {
HttpClient client = HttpClient
.newBuilder()
.build();
HttpRequest request = HttpRequest
.newBuilder(new URI("http://jsonplaceholder.typicode.com/posts"))
.POST(BodyProcessor.fromString("Sample Post Request"))
.build();
HttpResponse<String> response
= client.send(request, HttpResponse.BodyHandler.asString());
String responseBody = response.body();
System.out.println(responseBody);
}
public static void asynchronousRequest() throws URISyntaxException {
HttpClient client = HttpClient.newHttpClient();
URI httpURI = new URI("http://jsonplaceholder.typicode.com/posts/1");
HttpRequest request = HttpRequest.newBuilder(httpURI).GET().build();
CompletableFuture<HttpResponse<String>> futureResponse = client.sendAsync(request,
HttpResponse.BodyHandler.asString());
}
public static void asynchronousMultipleRequests() throws URISyntaxException {
List<URI> targets = Arrays.asList(new URI("http://jsonplaceholder.typicode.com/posts/1"), new URI("http://jsonplaceholder.typicode.com/posts/2"));
HttpClient client = HttpClient.newHttpClient();
List<CompletableFuture<File>> futures = targets
.stream()
.map(target -> client
.sendAsync(
HttpRequest.newBuilder(target)
.GET()
.build(),
BodyHandler.asFile(Paths.get("base", target.getPath())))
.thenApply(response -> response.body())
.thenApply(path -> path.toFile()))
.collect(Collectors.toList());
}
}

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@ -1,3 +0,0 @@
module com.baeldung.httpclient {
requires jdk.incubator.httpclient;
}

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@ -1,218 +0,0 @@
package com.baeldung.java9.httpclient;
import jdk.incubator.http.HttpClient;
import jdk.incubator.http.HttpRequest;
import jdk.incubator.http.HttpResponse;
import org.junit.Test;
import java.io.IOException;
import java.net.*;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.stream.Collectors;
import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.collection.IsEmptyCollection.empty;
import static org.hamcrest.core.IsNot.not;
import static org.junit.Assert.assertThat;
/**
* Created by adam.
*/
public class HttpClientIntegrationTest {
@Test
public void shouldReturnSampleDataContentWhenConnectViaSystemProxy() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.headers("Content-Type", "text/plain;charset=UTF-8")
.POST(HttpRequest.BodyProcessor.fromString("Sample body"))
.build();
HttpResponse<String> response = HttpClient.newBuilder()
.proxy(ProxySelector.getDefault())
.build()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.body(), containsString("Sample body"));
}
@Test
public void shouldNotFollowRedirectWhenSetToDefaultNever() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("http://stackoverflow.com"))
.version(HttpClient.Version.HTTP_1_1)
.GET()
.build();
HttpResponse<String> response = HttpClient.newBuilder()
.build()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_MOVED_PERM));
assertThat(response.body(), containsString(""));
}
@Test
public void shouldFollowRedirectWhenSetToAlways() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("http://stackoverflow.com"))
.version(HttpClient.Version.HTTP_1_1)
.GET()
.build();
HttpResponse<String> response = HttpClient.newBuilder()
.followRedirects(HttpClient.Redirect.ALWAYS)
.build()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.finalRequest()
.uri()
.toString(), equalTo("https://stackoverflow.com/"));
}
@Test
public void shouldReturnOKStatusForAuthenticatedAccess() throws URISyntaxException, IOException, InterruptedException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/basic-auth"))
.GET()
.build();
HttpResponse<String> response = HttpClient.newBuilder()
.authenticator(new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("postman", "password".toCharArray());
}
})
.build()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldSendRequestAsync() throws URISyntaxException, InterruptedException, ExecutionException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.headers("Content-Type", "text/plain;charset=UTF-8")
.POST(HttpRequest.BodyProcessor.fromString("Sample body"))
.build();
CompletableFuture<HttpResponse<String>> response = HttpClient.newBuilder()
.build()
.sendAsync(request, HttpResponse.BodyHandler.asString());
assertThat(response.get()
.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldUseJustTwoThreadWhenProcessingSendAsyncRequest() throws URISyntaxException, InterruptedException, ExecutionException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.GET()
.build();
ExecutorService executorService = Executors.newFixedThreadPool(2);
CompletableFuture<HttpResponse<String>> response1 = HttpClient.newBuilder()
.executor(executorService)
.build()
.sendAsync(request, HttpResponse.BodyHandler.asString());
CompletableFuture<HttpResponse<String>> response2 = HttpClient.newBuilder()
.executor(executorService)
.build()
.sendAsync(request, HttpResponse.BodyHandler.asString());
CompletableFuture<HttpResponse<String>> response3 = HttpClient.newBuilder()
.executor(executorService)
.build()
.sendAsync(request, HttpResponse.BodyHandler.asString());
CompletableFuture.allOf(response1, response2, response3)
.join();
assertThat(response1.get()
.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response2.get()
.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response3.get()
.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldNotStoreCookieWhenPolicyAcceptNone() throws URISyntaxException, IOException, InterruptedException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.GET()
.build();
HttpClient httpClient = HttpClient.newBuilder()
.cookieManager(new CookieManager(null, CookiePolicy.ACCEPT_NONE))
.build();
httpClient.send(request, HttpResponse.BodyHandler.asString());
assertThat(httpClient.cookieManager()
.get()
.getCookieStore()
.getCookies(), empty());
}
@Test
public void shouldStoreCookieWhenPolicyAcceptAll() throws URISyntaxException, IOException, InterruptedException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.GET()
.build();
HttpClient httpClient = HttpClient.newBuilder()
.cookieManager(new CookieManager(null, CookiePolicy.ACCEPT_ALL))
.build();
httpClient.send(request, HttpResponse.BodyHandler.asString());
assertThat(httpClient.cookieManager()
.get()
.getCookieStore()
.getCookies(), not(empty()));
}
@Test
public void shouldProcessMultipleRequestViaStream() throws URISyntaxException, ExecutionException, InterruptedException {
List<URI> targets = Arrays.asList(new URI("https://postman-echo.com/get?foo1=bar1"), new URI("https://postman-echo.com/get?foo2=bar2"));
HttpClient client = HttpClient.newHttpClient();
List<CompletableFuture<String>> futures = targets.stream()
.map(target -> client.sendAsync(HttpRequest.newBuilder(target)
.GET()
.build(), HttpResponse.BodyHandler.asString())
.thenApply(response -> response.body()))
.collect(Collectors.toList());
CompletableFuture.allOf(futures.toArray(new CompletableFuture[0]))
.join();
if (futures.get(0)
.get()
.contains("foo1")) {
assertThat(futures.get(0)
.get(), containsString("bar1"));
assertThat(futures.get(1)
.get(), containsString("bar2"));
} else {
assertThat(futures.get(1)
.get(), containsString("bar2"));
assertThat(futures.get(1)
.get(), containsString("bar1"));
}
}
}

View File

@ -1,171 +0,0 @@
package com.baeldung.java9.httpclient;
import jdk.incubator.http.HttpClient;
import jdk.incubator.http.HttpRequest;
import jdk.incubator.http.HttpResponse;
import org.junit.Test;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.file.Paths;
import java.security.NoSuchAlgorithmException;
import java.time.Duration;
import static java.time.temporal.ChronoUnit.SECONDS;
import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.junit.Assert.assertThat;
/**
* Created by adam.
*/
public class HttpRequestIntegrationTest {
@Test
public void shouldReturnStatusOKWhenSendGetRequest() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.GET()
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldUseHttp2WhenWebsiteUsesHttp2() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://stackoverflow.com"))
.version(HttpClient.Version.HTTP_2)
.GET()
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.version(), equalTo(HttpClient.Version.HTTP_2));
}
@Test
public void shouldFallbackToHttp1_1WhenWebsiteDoesNotUseHttp2() throws IOException, InterruptedException, URISyntaxException, NoSuchAlgorithmException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.version(HttpClient.Version.HTTP_2)
.GET()
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.version(), equalTo(HttpClient.Version.HTTP_1_1));
}
@Test
public void shouldReturnStatusOKWhenSendGetRequestWithDummyHeaders() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.headers("key1", "value1", "key2", "value2")
.GET()
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldReturnStatusOKWhenSendGetRequestTimeoutSet() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.timeout(Duration.of(10, SECONDS))
.GET()
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldReturnNoContentWhenPostWithNoBody() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.POST(HttpRequest.noBody())
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldReturnSampleDataContentWhenPostWithBodyText() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.headers("Content-Type", "text/plain;charset=UTF-8")
.POST(HttpRequest.BodyProcessor.fromString("Sample request body"))
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.body(), containsString("Sample request body"));
}
@Test
public void shouldReturnSampleDataContentWhenPostWithInputStream() throws IOException, InterruptedException, URISyntaxException {
byte[] sampleData = "Sample request body".getBytes();
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.headers("Content-Type", "text/plain;charset=UTF-8")
.POST(HttpRequest.BodyProcessor.fromInputStream(() -> new ByteArrayInputStream(sampleData)))
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.body(), containsString("Sample request body"));
}
@Test
public void shouldReturnSampleDataContentWhenPostWithByteArrayProcessorStream() throws IOException, InterruptedException, URISyntaxException {
byte[] sampleData = "Sample request body".getBytes();
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.headers("Content-Type", "text/plain;charset=UTF-8")
.POST(HttpRequest.BodyProcessor.fromByteArray(sampleData))
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.body(), containsString("Sample request body"));
}
@Test
public void shouldReturnSampleDataContentWhenPostWithFileProcessorStream() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.headers("Content-Type", "text/plain;charset=UTF-8")
.POST(HttpRequest.BodyProcessor.fromFile(Paths.get("src/test/resources/sample.txt")))
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.body(), containsString("Sample file content"));
}
}

View File

@ -1,55 +0,0 @@
package com.baeldung.java9.httpclient;
import jdk.incubator.http.HttpClient;
import jdk.incubator.http.HttpRequest;
import jdk.incubator.http.HttpResponse;
import org.junit.Test;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.Matchers.isEmptyString;
import static org.hamcrest.core.IsNot.not;
import static org.junit.Assert.assertThat;
/**
* Created by adam.
*/
public class HttpResponseIntegrationTest {
@Test
public void shouldReturnStatusOKWhenSendGetRequest() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.GET()
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.body(), not(isEmptyString()));
}
@Test
public void shouldResponseURIDifferentThanRequestUIRWhenRedirect() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("http://stackoverflow.com"))
.version(HttpClient.Version.HTTP_1_1)
.GET()
.build();
HttpResponse<String> response = HttpClient.newBuilder()
.followRedirects(HttpClient.Redirect.ALWAYS)
.build()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(request.uri()
.toString(), equalTo("http://stackoverflow.com"));
assertThat(response.uri()
.toString(), equalTo("https://stackoverflow.com/"));
}
}

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<build>

View File

@ -10,3 +10,4 @@ This module contains articles about advanced operations on arrays in Java. They
- [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)

View File

@ -26,10 +26,50 @@
<version>${assertj-core.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>${jmh.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>${jmh.version}</version>
</dependency>
</dependencies>
<properties>
<assertj-core.version>3.10.0</assertj-core.version>
<jmh.version>1.33</jmh.version>
</properties>
<build>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<mainClass>com.baeldung.copyarraymethodsperformance.BenchmarkRunner</mainClass>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

View File

@ -0,0 +1,11 @@
package com.baeldung.copyarraymethodsperformance;
public class BenchmarkRunner {
public static void main(String[] args) throws Exception {
org.openjdk.jmh.Main.main(args);
}
}

View File

@ -0,0 +1,42 @@
package com.baeldung.copyarraymethodsperformance;
import org.openjdk.jmh.annotations.*;
import java.util.Arrays;
import java.util.Random;
import java.util.concurrent.TimeUnit;
@BenchmarkMode(Mode.AverageTime)
@State(Scope.Thread)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Warmup(iterations = 10)
@Fork(1)
@Measurement(iterations = 100)
public class ObjectsCopyBenchmark {
@Param({ "10", "1000000" })
public int SIZE;
Integer[] src;
@Setup
public void setup() {
Random r = new Random();
src = new Integer[SIZE];
for (int i = 0; i < SIZE; i++) {
src[i] = r.nextInt();
}
}
@Benchmark
public Integer[] systemArrayCopyBenchmark() {
Integer[] target = new Integer[SIZE];
System.arraycopy(src, 0, target, 0, SIZE);
return target;
}
@Benchmark
public Integer[] arraysCopyOfBenchmark() {
return Arrays.copyOf(src, SIZE);
}
}

View File

@ -0,0 +1,43 @@
package com.baeldung.copyarraymethodsperformance;
import org.openjdk.jmh.annotations.*;
import java.util.Arrays;
import java.util.Random;
import java.util.concurrent.TimeUnit;
@BenchmarkMode(Mode.AverageTime)
@State(Scope.Thread)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Warmup(iterations = 10)
@Fork(1)
@Measurement(iterations = 100)
public class PrimitivesCopyBenchmark {
@Param({ "10", "1000000" })
public int SIZE;
int[] src;
@Setup
public void setup() {
Random r = new Random();
src = new int[SIZE];
for (int i = 0; i < SIZE; i++) {
src[i] = r.nextInt();
}
}
@Benchmark
public int[] systemArrayCopyBenchmark() {
int[] target = new int[SIZE];
System.arraycopy(src, 0, target, 0, SIZE);
return target;
}
@Benchmark
public int[] arraysCopyOfBenchmark() {
return Arrays.copyOf(src, SIZE);
}
}

View File

@ -11,7 +11,6 @@
<artifactId>core-java-modules</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>
@ -78,4 +77,5 @@
<guava.version>28.2-jre</guava.version>
<assertj-core.version>3.10.0</assertj-core.version>
</properties>
</project>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -11,7 +11,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
</parent>
<dependencies>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -8,5 +8,5 @@ This module contains articles about Map data structures in Java.
- [The Map.computeIfAbsent() Method](https://www.baeldung.com/java-map-computeifabsent)
- [Collections.synchronizedMap vs. ConcurrentHashMap](https://www.baeldung.com/java-synchronizedmap-vs-concurrenthashmap)
- [Java HashMap Load Factor](https://www.baeldung.com/java-hashmap-load-factor)
- [Converting java.util.Properties to HashMap](https://www.baeldung.com/java-convert-properties-to-hashmap)
- [Converting Java Properties to HashMap](https://www.baeldung.com/java-convert-properties-to-hashmap)
- More articles: [[<-- prev]](/core-java-modules/core-java-collections-maps-2)

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -0,0 +1,6 @@
## Java Collections Cookbooks and Examples
This module contains articles about Map data structures in Java.
### Relevant Articles:
- [Using a Custom Class as a Key in a Java HashMap](https://www.baeldung.com/custom-key-hashmap)

View File

@ -0,0 +1,34 @@
<?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">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-collections-maps-4</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-maps-4</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
</parent>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>3.0.0-M5</version>
<configuration>
<!-- those tests are not made for CI purposes, but for manual testing -->
<groups>!performance</groups>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>

View File

@ -0,0 +1,39 @@
package com.baeldung.maps;
import java.util.Objects;
public class CoordinateKey {
private final int x;
private final int y;
private final int hashCode;
public CoordinateKey(int x, int y) {
this.x = x;
this.y = y;
this.hashCode = Objects.hash(x, y);
}
public int getX() {
return x;
}
public int getY() {
return y;
}
@Override
public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
CoordinateKey that = (CoordinateKey) o;
return x == that.x && y == that.y;
}
@Override
public int hashCode() {
return this.hashCode;
}
}

View File

@ -0,0 +1,45 @@
package com.baeldung.maps;
import java.util.Objects;
public class CoordinateMutableKey {
private int x;
private int y;
public CoordinateMutableKey(int x, int y) {
this.x = x;
this.y = y;
}
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
public int getY() {
return y;
}
public void setY(int y) {
this.y = y;
}
@Override
public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
CoordinateMutableKey that = (CoordinateMutableKey) o;
return x == that.x && y == that.y;
}
@Override
public int hashCode() {
return Objects.hash(x, y);
}
}

View File

@ -0,0 +1,13 @@
package com.baeldung.maps;
public class CoordinateSlowKey extends CoordinateKey {
public CoordinateSlowKey(int x, int y) {
super(x, y);
}
@Override
public int hashCode() {
return 1;
}
}

View File

@ -0,0 +1,80 @@
package com.baeldung.maps;
import org.junit.jupiter.api.Tag;
import org.junit.jupiter.api.Test;
import java.awt.*;
import java.util.HashMap;
import java.util.Map;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
public class CoordinateKeyUnitTest {
private Map<CoordinateKey, Color> pixels = new HashMap<>();
@Test
void testOptimalKey() {
// setup
CoordinateKey coord = new CoordinateKey(1, 2);
pixels.put(coord, Color.CYAN);
// read out color correctly
assertEquals(Color.CYAN, pixels.get(coord));
}
@Test
void testSlowKey() {
// setup
CoordinateKey coord = new CoordinateSlowKey(1, 2);
pixels.put(coord, Color.CYAN);
// read out color correctly
assertEquals(Color.CYAN, pixels.get(coord));
}
// Performance Test Parameters - change here
private static final int MAX_X = 100;
private static final int MAX_Y = 100;
private static final int COUNT_OF_QUERIES = 1000;
private static final int QUERY_X = 1;
private static final int QUERY_Y = 1;
@Tag("performance")
@Test
void testKeyPerformance() {
// generate some sample keys and values
for (int x = 0; x < MAX_X; x++) {
for (int y = 0; y < MAX_Y; y++) {
pixels.put(new CoordinateKey(x, y), new Color(x % 255, y % 255, (x + y) % 255));
}
}
// read out multiple times and measure time
CoordinateKey coord = new CoordinateKey(QUERY_X, QUERY_Y);
long t1 = System.currentTimeMillis();
for (int i = 0; i < COUNT_OF_QUERIES; i++) {
assertNotNull(pixels.get(coord));
}
long t2 = System.currentTimeMillis();
System.out.printf("Optimal key performance: %d ms%n", t2 - t1);
}
@Tag("performance")
@Test
void testSlowKeyPerformance() {
// generate some sample keys and values
for (int x = 0; x < MAX_X; x++) {
for (int y = 0; y < MAX_Y; y++) {
pixels.put(new CoordinateSlowKey(x, y), new Color(x % 255, y % 255, (x + y) % 255));
}
}
// read out multiple times and measure time
CoordinateKey coord = new CoordinateSlowKey(QUERY_X, QUERY_Y);
long t1 = System.currentTimeMillis();
for (int i = 0; i < COUNT_OF_QUERIES; i++) {
assertNotNull(pixels.get(coord));
}
long t2 = System.currentTimeMillis();
System.out.printf("Slow key performance: %d ms%n", t2 - t1);
}
}

View File

@ -0,0 +1,27 @@
package com.baeldung.maps;
import org.junit.jupiter.api.Test;
import java.awt.*;
import java.util.HashMap;
import java.util.Map;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNull;
public class CoordinateMutableKeyUnitTest {
@Test
void testKeyMutable() {
// setup
Map<CoordinateMutableKey, Color> pixels = new HashMap<>();
CoordinateMutableKey coord = new CoordinateMutableKey(1, 2);
pixels.put(coord, Color.CYAN);
// read out color correctly
assertEquals(Color.CYAN, pixels.get(coord));
// change key's hashcode should result in null value
coord.setX(10);
assertNull(pixels.get(coord));
}
}

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<build>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -11,7 +11,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -3,6 +3,6 @@
### Relevant Articles:
- [Read and Write User Input in Java](http://www.baeldung.com/java-console-input-output)
- [Formatting with printf() in Java](https://www.baeldung.com/java-printstream-printf)
- [Formatting Output with printf() in Java](https://www.baeldung.com/java-printstream-printf)
- [ASCII Art in Java](http://www.baeldung.com/ascii-art-in-java)
- [System.console() vs. System.out](https://www.baeldung.com/java-system-console-vs-system-out)

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<build>

View File

@ -26,7 +26,6 @@
<artifactId>commons-lang3</artifactId>
<version>${commons-lang3.version}</version>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -12,7 +12,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>

View File

@ -13,7 +13,6 @@
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<dependencies>
@ -36,4 +35,5 @@
<!-- testing -->
<assertj-core.version>3.10.0</assertj-core.version>
</properties>
</project>

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