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Merge branch 'master' into pr/1014-stephen

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slavisa-baeldung
2017-01-20 08:21:36 +01:00
parent 03902d2507 ad63b55edb
commit 444c475d7c
319 changed files with 8386 additions and 1351 deletions
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4
core-java/.gitignore vendored
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@@ -16,3 +16,7 @@
*.txt
/bin/
/temp
#IntelliJ specific
.idea
*.iml

8
core-java/README.md
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@@ -46,3 +46,11 @@
- [Grep in Java](http://www.baeldung.com/grep-in-java)
- [Java - Combine Multiple Collections](http://www.baeldung.com/java-combine-multiple-collections)
- [Simulated Annealing for Travelling Salesman Problem](http://www.baeldung.com/java-simulated-annealing-for-traveling-salesman)
- [Slope One Algorithm: Collaborative Filtering Recommendation Systems](http://www.baeldung.com/java-collaborative-filtering-recommendations)
- [Differences Between the Java WatchService API and the Apache Commons IO Monitor Library](http://www.baeldung.com/java-watchservice-vs-apache-commons-io-monitor-library)
- [Pattern Search with Grep in Java](http://www.baeldung.com/grep-in-java)
- [URL Encoding and Decoding in Java](http://www.baeldung.com/java-url-encoding-decoding)
- [Calculate the Size of a File in Java](http://www.baeldung.com/java-file-size)
- [The Basics of Java Generics](http://www.baeldung.com/java-generics)
- [The Traveling Salesman Problem in Java](http://www.baeldung.com/java-simulated-annealing-for-traveling-salesman)
- [How to Create an Executable JAR with Maven](http://www.baeldung.com/executable-jar-with-maven)

9
core-java/pom.xml
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@@ -63,6 +63,12 @@
<artifactId>grep4j</artifactId>
<version>${grep4j.version}</version>
</dependency>
<dependency>
<groupId>com.lmax</groupId>
<artifactId>disruptor</artifactId>
<version>${disruptor.version}</version>
</dependency>
<!-- web -->
<!-- marshalling -->
@@ -352,7 +358,7 @@
<logback.version>1.1.7</logback.version>
<!-- util -->
<guava.version>19.0</guava.version>
<guava.version>21.0</guava.version>
<commons-lang3.version>3.5</commons-lang3.version>
<bouncycastle.version>1.55</bouncycastle.version>
<commons-codec.version>1.10</commons-codec.version>
@@ -363,6 +369,7 @@
<unix4j.version>0.4</unix4j.version>
<grep4j.version>1.8.7</grep4j.version>
<lombok.version>1.16.12</lombok.version>
<disruptor.version>3.3.6</disruptor.version>
<!-- testing -->
<org.hamcrest.version>1.3</org.hamcrest.version>

44
core-java/src/main/java/com/baeldung/chainedexception/LogWithChain.java Normal file
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@@ -0,0 +1,44 @@
package com.baeldung.chainedexception;
import com.baeldung.chainedexception.exceptions.GirlFriendOfManagerUpsetException;
import com.baeldung.chainedexception.exceptions.ManagerUpsetException;
import com.baeldung.chainedexception.exceptions.NoLeaveGrantedException;
import com.baeldung.chainedexception.exceptions.TeamLeadUpsetException;
public class LogWithChain {
public static void main(String[] args) throws Exception {
getLeave();
}
private static void getLeave() throws NoLeaveGrantedException {
try {
howIsTeamLead();
} catch (TeamLeadUpsetException e) {
throw new NoLeaveGrantedException("Leave not sanctioned.", e);
}
}
private static void howIsTeamLead() throws TeamLeadUpsetException {
try {
howIsManager();
} catch (ManagerUpsetException e) {
throw new TeamLeadUpsetException(
"Team lead is not in good mood", e);
}
}
private static void howIsManager() throws ManagerUpsetException {
try {
howIsGirlFriendOfManager();
} catch (GirlFriendOfManagerUpsetException e) {
throw new ManagerUpsetException("Manager is in bad mood", e);
}
}
private static void howIsGirlFriendOfManager()
throws GirlFriendOfManagerUpsetException {
throw new GirlFriendOfManagerUpsetException(
"Girl friend of manager is in bad mood");
}
}

47
core-java/src/main/java/com/baeldung/chainedexception/LogWithoutChain.java Normal file
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@@ -0,0 +1,47 @@
package com.baeldung.chainedexception;
import com.baeldung.chainedexception.exceptions.GirlFriendOfManagerUpsetException;
import com.baeldung.chainedexception.exceptions.ManagerUpsetException;
import com.baeldung.chainedexception.exceptions.NoLeaveGrantedException;
import com.baeldung.chainedexception.exceptions.TeamLeadUpsetException;
public class LogWithoutChain {
public static void main(String[] args) throws Exception {
getLeave();
}
private static void getLeave() throws NoLeaveGrantedException {
try {
howIsTeamLead();
} catch (TeamLeadUpsetException e) {
e.printStackTrace();
throw new NoLeaveGrantedException("Leave not sanctioned.");
}
}
private static void howIsTeamLead() throws TeamLeadUpsetException {
try {
howIsManager();
} catch (ManagerUpsetException e) {
e.printStackTrace();
throw new TeamLeadUpsetException(
"Team lead is not in good mood");
}
}
private static void howIsManager() throws ManagerUpsetException {
try {
howIsGirlFriendOfManager();
} catch (GirlFriendOfManagerUpsetException e) {
e.printStackTrace();
throw new ManagerUpsetException("Manager is in bad mood");
}
}
private static void howIsGirlFriendOfManager()
throws GirlFriendOfManagerUpsetException {
throw new GirlFriendOfManagerUpsetException(
"Girl friend of manager is in bad mood");
}
}

12
core-java/src/main/java/com/baeldung/chainedexception/exceptions/GirlFriendOfManagerUpsetException.java Normal file
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@@ -0,0 +1,12 @@
package com.baeldung.chainedexception.exceptions;
public class GirlFriendOfManagerUpsetException extends Exception {
public GirlFriendOfManagerUpsetException(String message, Throwable cause) {
super(message, cause);
}
public GirlFriendOfManagerUpsetException(String message) {
super(message);
}
}

12
core-java/src/main/java/com/baeldung/chainedexception/exceptions/ManagerUpsetException.java Normal file
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@@ -0,0 +1,12 @@
package com.baeldung.chainedexception.exceptions;
public class ManagerUpsetException extends Exception {
public ManagerUpsetException(String message, Throwable cause) {
super(message, cause);
}
public ManagerUpsetException(String message) {
super(message);
}
}

12
core-java/src/main/java/com/baeldung/chainedexception/exceptions/NoLeaveGrantedException.java Normal file
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@@ -0,0 +1,12 @@
package com.baeldung.chainedexception.exceptions;
public class NoLeaveGrantedException extends Exception {
public NoLeaveGrantedException(String message, Throwable cause) {
super(message, cause);
}
public NoLeaveGrantedException(String message) {
super(message);
}
}

12
core-java/src/main/java/com/baeldung/chainedexception/exceptions/TeamLeadUpsetException.java Normal file
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@@ -0,0 +1,12 @@
package com.baeldung.chainedexception.exceptions;
public class TeamLeadUpsetException extends Exception {
public TeamLeadUpsetException(String message, Throwable cause) {
super(message, cause);
}
public TeamLeadUpsetException(String message) {
super(message);
}
}

34
core-java/src/main/java/com/baeldung/disruptor/DelayedMultiEventProducer.java Normal file
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@@ -0,0 +1,34 @@
package com.baeldung.disruptor;
import com.lmax.disruptor.RingBuffer;
public class DelayedMultiEventProducer implements EventProducer {
@Override
public void startProducing(final RingBuffer<ValueEvent> ringBuffer, final int count) {
final Runnable simpleProducer = () -> produce(ringBuffer, count, false);
final Runnable delayedProducer = () -> produce(ringBuffer, count, true);
new Thread(simpleProducer).start();
new Thread(delayedProducer).start();
}
private void produce(final RingBuffer<ValueEvent> ringBuffer, final int count, final boolean addDelay) {
for (int i = 0; i < count; i++) {
final long seq = ringBuffer.next();
final ValueEvent valueEvent = ringBuffer.get(seq);
valueEvent.setValue(i);
ringBuffer.publish(seq);
if (addDelay) {
addDelay();
}
}
}
private void addDelay() {
try {
Thread.sleep(1000);
} catch (InterruptedException interruptedException) {
// No-Op lets swallow it
}
}
}

13
core-java/src/main/java/com/baeldung/disruptor/EventConsumer.java Normal file
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@@ -0,0 +1,13 @@
package com.baeldung.disruptor;
import com.lmax.disruptor.EventHandler;
/**
* Consumer that consumes event from ring buffer.
*/
public interface EventConsumer {
/**
* One or more event handler to handle event from ring buffer.
*/
public EventHandler<ValueEvent>[] getEventHandler();
}

15
core-java/src/main/java/com/baeldung/disruptor/EventProducer.java Normal file
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@@ -0,0 +1,15 @@
package com.baeldung.disruptor;
import com.lmax.disruptor.RingBuffer;
/**
* Producer that produces event for ring buffer.
*/
public interface EventProducer {
/**
* Start the producer that would start producing the values.
* @param ringBuffer
* @param count
*/
public void startProducing(final RingBuffer<ValueEvent> ringBuffer, final int count);
}

23
core-java/src/main/java/com/baeldung/disruptor/MultiEventPrintConsumer.java Normal file
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@@ -0,0 +1,23 @@
package com.baeldung.disruptor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.lmax.disruptor.EventHandler;
public class MultiEventPrintConsumer implements EventConsumer {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
@Override
@SuppressWarnings("unchecked")
public EventHandler<ValueEvent>[] getEventHandler() {
final EventHandler<ValueEvent> eventHandler = (event, sequence, endOfBatch) -> print(event.getValue(), sequence);
final EventHandler<ValueEvent> otherEventHandler = (event, sequence, endOfBatch) -> print(event.getValue(), sequence);
return new EventHandler[] { eventHandler, otherEventHandler };
}
private void print(final int id, final long sequenceId) {
logger.info("Id is " + id + " sequence id that was used is " + sequenceId);
}
}

22
core-java/src/main/java/com/baeldung/disruptor/SingleEventPrintConsumer.java Normal file
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@@ -0,0 +1,22 @@
package com.baeldung.disruptor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.lmax.disruptor.EventHandler;
public class SingleEventPrintConsumer implements EventConsumer {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
@Override
@SuppressWarnings("unchecked")
public EventHandler<ValueEvent>[] getEventHandler() {
final EventHandler<ValueEvent> eventHandler = (event, sequence, endOfBatch) -> print(event.getValue(), sequence);
return new EventHandler[] { eventHandler };
}
private void print(final int id, final long sequenceId) {
logger.info("Id is " + id + " sequence id that was used is " + sequenceId);
}
}

22
core-java/src/main/java/com/baeldung/disruptor/SingleEventProducer.java Normal file
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@@ -0,0 +1,22 @@
package com.baeldung.disruptor;
import com.lmax.disruptor.RingBuffer;
public class SingleEventProducer implements EventProducer {
@Override
public void startProducing(RingBuffer<ValueEvent> ringBuffer, int count) {
final Runnable producer = () -> produce(ringBuffer, count);
new Thread(producer).start();
}
private void produce(final RingBuffer<ValueEvent> ringBuffer, final int count) {
for (int i = 0; i < count; i++) {
final long seq = ringBuffer.next();
final ValueEvent valueEvent = ringBuffer.get(seq);
valueEvent.setValue(i);
ringBuffer.publish(seq);
}
}
}

25
core-java/src/main/java/com/baeldung/disruptor/ValueEvent.java Normal file
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@@ -0,0 +1,25 @@
package com.baeldung.disruptor;
import org.apache.commons.lang3.builder.ToStringBuilder;
import com.lmax.disruptor.EventFactory;
public final class ValueEvent {
private int value;
public int getValue() {
return value;
}
public void setValue(int value) {
this.value = value;
}
public final static EventFactory<ValueEvent> EVENT_FACTORY = () -> new ValueEvent();
@Override
public String toString() {
return ToStringBuilder.reflectionToString(this);
}
}

57
core-java/src/main/java/com/baeldung/java8/lambda/exceptions/LambdaExceptionWrappers.java Normal file
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@@ -0,0 +1,57 @@
package com.baeldung.java8.lambda.exceptions;
import java.util.function.Consumer;
public class LambdaExceptionWrappers {
public static Consumer<Integer> lambdaWrapper(Consumer<Integer> consumer) {
return i -> {
try {
consumer.accept(i);
} catch (ArithmeticException e) {
System.err.println("Arithmetic Exception occured : " + e.getMessage());
}
};
}
static <T, E extends Exception> Consumer<T> consumerWrapper(Consumer<T> consumer, Class<E> clazz) {
return i -> {
try {
consumer.accept(i);
} catch (Exception ex) {
try {
E exCast = clazz.cast(ex);
System.err.println("Exception occured : " + exCast.getMessage());
} catch (ClassCastException ccEx) {
throw ex;
}
}
};
}
public static <T> Consumer<T> throwingConsumerWrapper(ThrowingConsumer<T, Exception> throwingConsumer) {
return i -> {
try {
throwingConsumer.accept(i);
} catch (Exception ex) {
throw new RuntimeException(ex);
}
};
}
public static <T, E extends Exception> Consumer<T> handlingConsumerWrapper(ThrowingConsumer<T, E> throwingConsumer, Class<E> exceptionClass) {
return i -> {
try {
throwingConsumer.accept(i);
} catch (Exception ex) {
try {
E exCast = exceptionClass.cast(ex);
System.err.println("Exception occured : " + exCast.getMessage());
} catch (ClassCastException ccEx) {
throw new RuntimeException(ex);
}
}
};
}
}

8
core-java/src/main/java/com/baeldung/java8/lambda/exceptions/ThrowingConsumer.java Normal file
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@@ -0,0 +1,8 @@
package com.baeldung.java8.lambda.exceptions;
@FunctionalInterface
public interface ThrowingConsumer<T, E extends Exception> {
void accept(T t) throws E;
}

48
core-java/src/main/java/com/baeldung/scripting/Nashorn.java
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@@ -1,48 +0,0 @@
package com.baeldung.scripting;
import javax.script.Bindings;
import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
public class Nashorn {
public static void main(String[] args) throws ScriptException, NoSuchMethodException {
ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
Object result = engine.eval(
"var greeting='hello world';" +
"print(greeting);" +
"greeting");
System.out.println(result);
Bindings bindings = engine.createBindings();
bindings.put("count", 3);
bindings.put("name", "baeldung");
String script = "var greeting='Hello ';" +
"for(var i=count;i>0;i--) { " +
"greeting+=name + ' '" +
"}" +
"greeting";
Object bindingsResult = engine.eval(script, bindings);
System.out.println(bindingsResult);
engine.eval("function composeGreeting(name) {" +
"return 'Hello ' + name" +
"}");
Invocable invocable = (Invocable) engine;
Object funcResult = invocable.invokeFunction("composeGreeting", "baeldung");
System.out.println(funcResult);
Object map = engine.eval("var HashMap = Java.type('java.util.HashMap');" +
"var map = new HashMap();" +
"map.put('hello', 'world');" +
"map");
System.out.println(map);
}
}

15
core-java/src/main/resources/js/bind.js Normal file
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@@ -0,0 +1,15 @@
var first = {
name: "Whiskey",
age: 5
};
var second = {
volume: 100
};
Object.bindProperties(first, second);
print(first.volume);
second.volume = 1000;
print(first.volume);

1
core-java/src/main/resources/js/locations.js Normal file
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@@ -0,0 +1 @@
print(__FILE__, __LINE__, __DIR__);

19
core-java/src/main/resources/js/math_module.js Normal file
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@@ -0,0 +1,19 @@
var math = {
increment: function (num) {
return ++num;
},
failFunc: function () {
try {
throw "BOOM";
} catch (e if typeof e === 'string') {
print("String thrown: " + e);
}
catch (e) {
print("this shouldn't happen!");
}
}
};
math;

11
core-java/src/main/resources/js/no_such.js Normal file
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@@ -0,0 +1,11 @@
var demo = {
__noSuchProperty__: function (propName) {
print("Accessed non-existing property: " + propName);
},
__noSuchMethod__: function (methodName) {
print("Invoked non-existing method: " + methodName);
}
};
demo;

1
core-java/src/main/resources/js/script.js Normal file
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@@ -0,0 +1 @@
function increment(num) ++num;

2
core-java/src/main/resources/js/trim.js Normal file
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@@ -0,0 +1,2 @@
print(" hello world".trimLeft());
print("hello world ".trimRight());

9
core-java/src/main/resources/js/typed_arrays.js Normal file
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@@ -0,0 +1,9 @@
function arrays(arr) {
var javaIntArray = Java.to(arr, "int[]");
print(javaIntArray[0]);
print(javaIntArray[1]);
print(javaIntArray[2]);
}
arrays([100, "1654", true]);

83
core-java/src/test/java/com/baeldung/disruptor/DisruptorTest.java Normal file
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@@ -0,0 +1,83 @@
package com.baeldung.disruptor;
import java.util.concurrent.ThreadFactory;
import org.junit.Before;
import org.junit.Test;
import com.lmax.disruptor.BusySpinWaitStrategy;
import com.lmax.disruptor.RingBuffer;
import com.lmax.disruptor.WaitStrategy;
import com.lmax.disruptor.dsl.Disruptor;
import com.lmax.disruptor.dsl.ProducerType;
import com.lmax.disruptor.util.DaemonThreadFactory;
public class DisruptorTest {
private Disruptor<ValueEvent> disruptor;
private WaitStrategy waitStrategy;
@Before
public void setUp() throws Exception {
waitStrategy = new BusySpinWaitStrategy();
}
private void createDisruptor(final ProducerType producerType, final EventConsumer eventConsumer) {
final ThreadFactory threadFactory = DaemonThreadFactory.INSTANCE;
disruptor = new Disruptor<ValueEvent>(ValueEvent.EVENT_FACTORY, 16, threadFactory, producerType, waitStrategy);
disruptor.handleEventsWith(eventConsumer.getEventHandler());
}
private void startProducing(final RingBuffer<ValueEvent> ringBuffer, final int count, final EventProducer eventProducer) {
eventProducer.startProducing(ringBuffer, count);
}
@Test
public void whenMultipleProducerSingleConsumer_thenOutputInFifoOrder() {
final EventConsumer eventConsumer = new SingleEventPrintConsumer();
final EventProducer eventProducer = new DelayedMultiEventProducer();
createDisruptor(ProducerType.MULTI, eventConsumer);
final RingBuffer<ValueEvent> ringBuffer = disruptor.start();
startProducing(ringBuffer, 32, eventProducer);
disruptor.halt();
disruptor.shutdown();
}
@Test
public void whenSingleProducerSingleConsumer_thenOutputInFifoOrder() {
final EventConsumer eventConsumer = new SingleEventConsumer();
final EventProducer eventProducer = new SingleEventProducer();
createDisruptor(ProducerType.SINGLE, eventConsumer);
final RingBuffer<ValueEvent> ringBuffer = disruptor.start();
startProducing(ringBuffer, 32, eventProducer);
disruptor.halt();
disruptor.shutdown();
}
@Test
public void whenSingleProducerMultipleConsumer_thenOutputInFifoOrder() {
final EventConsumer eventConsumer = new MultiEventConsumer();
final EventProducer eventProducer = new SingleEventProducer();
createDisruptor(ProducerType.SINGLE, eventConsumer);
final RingBuffer<ValueEvent> ringBuffer = disruptor.start();
startProducing(ringBuffer, 32, eventProducer);
disruptor.halt();
disruptor.shutdown();
}
@Test
public void whenMultipleProducerMultipleConsumer_thenOutputInFifoOrder() {
final EventConsumer eventConsumer = new MultiEventPrintConsumer();
final EventProducer eventProducer = new DelayedMultiEventProducer();
createDisruptor(ProducerType.MULTI, eventConsumer);
final RingBuffer<ValueEvent> ringBuffer = disruptor.start();
startProducing(ringBuffer, 32, eventProducer);
disruptor.halt();
disruptor.shutdown();
}
}

27
core-java/src/test/java/com/baeldung/disruptor/MultiEventConsumer.java Normal file
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@@ -0,0 +1,27 @@
package com.baeldung.disruptor;
import static org.junit.Assert.assertEquals;
import com.lmax.disruptor.EventHandler;
public class MultiEventConsumer implements EventConsumer {
private int expectedValue = -1;
private int otherExpectedValue = -1;
@Override
@SuppressWarnings("unchecked")
public EventHandler<ValueEvent>[] getEventHandler() {
final EventHandler<ValueEvent> eventHandler = (event, sequence, endOfBatch) -> assertExpectedValue(event.getValue());
final EventHandler<ValueEvent> otherEventHandler = (event, sequence, endOfBatch) -> assertOtherExpectedValue(event.getValue());
return new EventHandler[] { eventHandler, otherEventHandler };
}
private void assertExpectedValue(final int id) {
assertEquals(++expectedValue, id);
}
private void assertOtherExpectedValue(final int id) {
assertEquals(++otherExpectedValue, id);
}
}

21
core-java/src/test/java/com/baeldung/disruptor/SingleEventConsumer.java Normal file
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@@ -0,0 +1,21 @@
package com.baeldung.disruptor;
import static org.junit.Assert.assertEquals;
import com.lmax.disruptor.EventHandler;
public class SingleEventConsumer implements EventConsumer {
private int expectedValue = -1;
@Override
@SuppressWarnings("unchecked")
public EventHandler<ValueEvent>[] getEventHandler() {
final EventHandler<ValueEvent> eventHandler = (event, sequence, endOfBatch) -> assertExpectedValue(event.getValue());
return new EventHandler[] { eventHandler };
}
private void assertExpectedValue(final int id) {
assertEquals(++expectedValue, id);
}
}

122
core-java/src/test/java/com/baeldung/guava/GuavaBiMapTest.java Normal file
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@@ -0,0 +1,122 @@
package com.baeldung.guava;
import static org.junit.Assert.*;
import java.util.HashMap;
import java.util.Map;
import org.junit.Test;
import com.google.common.collect.BiMap;
import com.google.common.collect.EnumHashBiMap;
import com.google.common.collect.HashBiMap;
import com.google.common.collect.ImmutableBiMap;
public class GuavaBiMapTest {
@Test
public void whenQueryByValue_shouldReturnKey() {
final BiMap<String, String> capitalCountryBiMap = HashBiMap.create();
capitalCountryBiMap.put("New Delhi", "India");
capitalCountryBiMap.put("Washingon, D.C.", "USA");
capitalCountryBiMap.put("Moscow", "Russia");
final String countryHeadName = capitalCountryBiMap.inverse().get("India");
assertEquals("New Delhi", countryHeadName);
}
@Test
public void whenCreateBiMapFromExistingMap_shouldReturnKey() {
final Map<String, String> personCountryHeadMap = new HashMap<>();
personCountryHeadMap.put("New Delhi", "India");
personCountryHeadMap.put("Washingon, D.C.", "USA");
personCountryHeadMap.put("Moscow", "Russia");
final BiMap<String, String> capitalCountryBiMap = HashBiMap.create(personCountryHeadMap);
final String countryHeadName = capitalCountryBiMap.inverse().get("India");
assertEquals("New Delhi", countryHeadName);
}
@Test
public void whenQueryByKey_shouldReturnValue() {
final BiMap<String, String> capitalCountryBiMap = HashBiMap.create();
capitalCountryBiMap.put("New Delhi", "India");
capitalCountryBiMap.put("Washingon, D.C.", "USA");
capitalCountryBiMap.put("Moscow", "Russia");
assertEquals("USA", capitalCountryBiMap.get("Washingon, D.C."));
}
@Test(expected = IllegalArgumentException.class)
public void whenSameValueIsBeingPresent_shouldThrowException() {
final BiMap<String, String> capitalCountryBiMap = HashBiMap.create();
capitalCountryBiMap.put("New Delhi", "India");
capitalCountryBiMap.put("Washingon, D.C.", "USA");
capitalCountryBiMap.put("Moscow", "Russia");
capitalCountryBiMap.put("Trump", "USA");
}
@Test
public void givenSameValueIsBeingPresent_whenForcePutIsUsed_shouldCompleteSuccessfully() {
final BiMap<String, String> capitalCountryBiMap = HashBiMap.create();
capitalCountryBiMap.put("New Delhi", "India");
capitalCountryBiMap.put("Washingon, D.C.", "USA");
capitalCountryBiMap.put("Moscow", "Russia");
capitalCountryBiMap.forcePut("Trump", "USA");
assertEquals("USA", capitalCountryBiMap.get("Trump"));
assertEquals("Trump", capitalCountryBiMap.inverse().get("USA"));
}
@Test
public void whenSameKeyIsBeingPresent_shouldReplaceAlreadyPresent() {
final BiMap<String, String> capitalCountryBiMap = HashBiMap.create();
capitalCountryBiMap.put("New Delhi", "India");
capitalCountryBiMap.put("Washingon, D.C.", "USA");
capitalCountryBiMap.put("Moscow", "Russia");
capitalCountryBiMap.put("Washingon, D.C.", "HongKong");
assertEquals("HongKong", capitalCountryBiMap.get("Washingon, D.C."));
}
@Test
public void whenUsingImmutableBiMap_shouldAllowPutSuccessfully() {
final BiMap<String, String> capitalCountryBiMap = new ImmutableBiMap.Builder<String, String>().put("New Delhi", "India").put("Washingon, D.C.", "USA").put("Moscow", "Russia").build();
assertEquals("USA", capitalCountryBiMap.get("Washingon, D.C."));
}
@Test(expected = UnsupportedOperationException.class)
public void whenUsingImmutableBiMap_shouldNotAllowRemove() {
final BiMap<String, String> capitalCountryBiMap = new ImmutableBiMap.Builder<String, String>().put("New Delhi", "India").put("Washingon, D.C.", "USA").put("Moscow", "Russia").build();
capitalCountryBiMap.remove("New Delhi");
}
@Test(expected = UnsupportedOperationException.class)
public void whenUsingImmutableBiMap_shouldNotAllowPut() {
final BiMap<String, String> capitalCountryBiMap = new ImmutableBiMap.Builder<String, String>().put("New Delhi", "India").put("Washingon, D.C.", "USA").put("Moscow", "Russia").build();
capitalCountryBiMap.put("New York", "USA");
}
private enum Operation {
ADD, SUBTRACT, MULTIPLY, DIVIDE
}
@Test
public void whenUsingEnumAsKeyInMap_shouldReplaceAlreadyPresent() {
final BiMap<Operation, String> operationStringBiMap = EnumHashBiMap.create(Operation.class);
operationStringBiMap.put(Operation.ADD, "Add");
operationStringBiMap.put(Operation.SUBTRACT, "Subtract");
operationStringBiMap.put(Operation.MULTIPLY, "Multiply");
operationStringBiMap.put(Operation.DIVIDE, "Divide");
assertEquals("Divide", operationStringBiMap.get(Operation.DIVIDE));
}
}

32
core-java/src/test/java/com/baeldung/java/conversion/IterableStreamConversionTest.java Normal file
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@@ -0,0 +1,32 @@
package com.baeldung.java.conversion;
import org.junit.Assert;
import org.junit.Test;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.collection.IsIterableContainingInOrder.contains;
public class IterableStreamConversionTest {
@Test
public void givenIterable_whenConvertedToStream_thenNotNull() {
Iterable<String> iterable = Arrays.asList("Testing", "Iterable", "conversion", "to", "Stream");
Assert.assertNotNull(StreamSupport.stream(iterable.spliterator(), false));
}
@Test
public void whenConvertedToList_thenCorrect() {
Iterable<String> iterable = Arrays.asList("Testing", "Iterable", "conversion", "to", "Stream");
List<String> result = StreamSupport.stream(iterable.spliterator(), false)
.map(String::toUpperCase).collect(Collectors.toList());
assertThat(result, contains("TESTING", "ITERABLE", "CONVERSION", "TO", "STREAM"));
}
}

2
core-java/src/test/java/com/baeldung/java/map/README.md Normal file
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@@ -0,0 +1,2 @@
### Relevant Articles:
- [The Java HashMap Under the Hood](http://www.baeldung.com/java-hashmap)

8
core-java/src/test/java/com/baeldung/java/nio2/README.md
View File

@@ -1,3 +1,11 @@
### Relevant Articles:
- [Introduction to the Java NIO2 File API](http://www.baeldung.com/java-nio-2-file-api)
- [Java NIO2 Path API](http://www.baeldung.com/java-nio-2-path)
- [A Guide To NIO2 Asynchronous File Channel](http://www.baeldung.com/java-nio2-async-file-channel)
- [Guide to Selenium with JUnit / TestNG](http://www.baeldung.com/java-selenium-with-junit-and-testng)
- [A Guide to NIO2 Asynchronous Socket Channel](http://www.baeldung.com/java-nio2-async-socket-channel)
- [A Guide To NIO2 FileVisitor](http://www.baeldung.com/java-nio2-file-visitor)
- [A Guide To NIO2 File Attribute APIs](http://www.baeldung.com/java-nio2-file-attribute)
- [How to use the Spring FactoryBean?](http://www.baeldung.com/spring-factorybean)
- [A Guide to WatchService in Java NIO2](http://www.baeldung.com/java-nio2-watchservice)
- [Guide to Java NIO2 Asynchronous Channel APIs](http://www.baeldung.com/java-nio-2-async-channels)

6
core-java/src/test/java/com/baeldung/java8/Java8FindAnyFindFirstTest.java
View File

@@ -7,8 +7,10 @@ import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import static org.hamcrest.Matchers.*;
import static org.junit.Assert.*;
import static org.hamcrest.Matchers.anyOf;
import static org.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
public class Java8FindAnyFindFirstTest {

46
core-java/src/test/java/com/baeldung/java8/lambda/exceptions/LambdaExceptionWrappersTest.java Normal file
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@@ -0,0 +1,46 @@
package com.baeldung.java8.lambda.exceptions;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import static com.baeldung.java8.lambda.exceptions.LambdaExceptionWrappers.*;
public class LambdaExceptionWrappersTest {
private List<Integer> integers;
@Before
public void init() {
integers = Arrays.asList(3, 9, 7, 0, 10, 20);
}
@Test
public void whenNoExceptionFromLambdaWrapper_thenSuccess() {
integers.forEach(lambdaWrapper(i -> System.out.println(50 / i)));
}
@Test
public void whenNoExceptionFromConsumerWrapper_thenSuccess() {
integers.forEach(consumerWrapper(i -> System.out.println(50 / i), ArithmeticException.class));
}
@Test(expected = RuntimeException.class)
public void whenExceptionFromThrowingConsumerWrapper_thenSuccess() {
integers.forEach(throwingConsumerWrapper(i -> writeToFile(i)));
}
@Test
public void whenNoExceptionFromHandlingConsumerWrapper_thenSuccess() {
integers.forEach(handlingConsumerWrapper(i -> writeToFile(i), IOException.class));
}
private void writeToFile(Integer i) throws IOException {
if (i == 0) {
throw new IOException(); // mock IOException
}
}
}

2
core-java/src/test/java/com/baeldung/java8/optional/README.md Normal file
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@@ -0,0 +1,2 @@
### Relevant Articles:
- [Guide To Java 8 Optional](http://www.baeldung.com/java-optional)

111
core-java/src/test/java/com/baeldung/scripting/NashornTest.java Normal file
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@@ -0,0 +1,111 @@
package com.baeldung.scripting;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import javax.script.*;
import java.io.InputStreamReader;
import java.util.List;
import java.util.Map;
public class NashornTest {
private ScriptEngine engine;
@Before
public void setUp() {
engine = new ScriptEngineManager().getEngineByName("nashorn");
}
@Test
public void trim() throws ScriptException {
engine.eval(new InputStreamReader(NashornTest.class.getResourceAsStream("/js/trim.js")));
}
@Test
public void locations() throws ScriptException {
engine.eval(new InputStreamReader(NashornTest.class.getResourceAsStream("/js/locations.js")));
}
@Test
public void bindProperties() throws ScriptException {
engine.eval(new InputStreamReader(NashornTest.class.getResourceAsStream("/js/bind.js")));
}
@Test
public void magicMethods() throws ScriptException {
engine.eval("var demo = load('classpath:js/no_such.js');" + "var tmp = demo.doesNotExist;" + "var none = demo.callNonExistingMethod()");
}
@Test
public void typedArrays() throws ScriptException {
engine.eval(new InputStreamReader(NashornTest.class.getResourceAsStream("/js/typed_arrays.js")));
}
@Test
public void basicUsage() throws ScriptException {
Object result = engine.eval("var greeting='hello world';" + "print(greeting);" + "greeting");
Assert.assertEquals("hello world", result);
}
@Test
public void jsonObjectExample() throws ScriptException {
Object obj = engine.eval("Java.asJSONCompatible({ number: 42, greet: 'hello', primes: [2,3,5,7,11,13] })");
Map<String, Object> map = (Map<String, Object>) obj;
Assert.assertEquals("hello", map.get("greet"));
Assert.assertTrue(List.class.isAssignableFrom(map
.get("primes")
.getClass()));
}
@Test
public void tryCatchGuard() throws ScriptException {
engine.eval("var math = loadWithNewGlobal('classpath:js/math_module.js');" + "math.failFunc();");
}
@Test
public void extensionsExamples() throws ScriptException {
String script = "var list = [1, 2, 3, 4, 5];" + "var result = '';" + "for each (var i in list) {" + "result+=i+'-';" + "};" + "print(result);";
engine.eval(script);
}
@Test
public void bindingsExamples() throws ScriptException {
Bindings bindings = engine.createBindings();
bindings.put("count", 3);
bindings.put("name", "baeldung");
String script = "var greeting='Hello ';" + "for(var i=count;i>0;i--) { " + "greeting+=name + ' '" + "}" + "greeting";
Object bindingsResult = engine.eval(script, bindings);
Assert.assertEquals("Hello baeldung baeldung baeldung ", bindingsResult);
}
@Test
public void jvmBoundaryExamples() throws ScriptException, NoSuchMethodException {
engine.eval("function composeGreeting(name) {" + "return 'Hello ' + name" + "}");
Invocable invocable = (Invocable) engine;
Object funcResult = invocable.invokeFunction("composeGreeting", "baeldung");
Assert.assertEquals("Hello baeldung", funcResult);
Object map = engine.eval("var HashMap = Java.type('java.util.HashMap');" + "var map = new HashMap();" + "map.put('hello', 'world');" + "map");
Assert.assertTrue(Map.class.isAssignableFrom(map.getClass()));
}
@Test
public void loadExamples() throws ScriptException {
Object loadResult = engine.eval("load('classpath:js/script.js');" + "increment(5)");
Assert.assertEquals(6.0, loadResult);
Object math = engine.eval("var math = loadWithNewGlobal('classpath:js/math_module.js');" + "math.increment(5);");
Assert.assertEquals(6.0, math);
}
}

3
core-java/src/test/java/org/baeldung/java/collections/README.md Normal file
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@@ -0,0 +1,3 @@
### Relevant Articles:
- [Join and Split Arrays and Collections in Java](http://www.baeldung.com/java-join-and-split)
- [Introduction to Java Servlets](http://www.baeldung.com/intro-to-servlets)

54
core-java/src/test/java/org/baeldung/java/io/JavaInputStreamToXUnitTest.java
View File

@@ -1,38 +1,26 @@
package org.baeldung.java.io;
import static org.apache.commons.lang3.RandomStringUtils.randomAlphabetic;
import static org.hamcrest.Matchers.equalTo;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringWriter;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.StandardCopyOption;
import java.util.Scanner;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.Charsets;
import com.google.common.io.ByteSource;
import com.google.common.io.ByteStreams;
import com.google.common.io.CharStreams;
import com.google.common.io.Files;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.*;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.StandardCopyOption;
import java.util.Scanner;
import static org.apache.commons.lang3.RandomStringUtils.randomAlphabetic;
import static org.hamcrest.Matchers.equalTo;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
@SuppressWarnings("unused")
public class JavaInputStreamToXUnitTest {
@@ -163,7 +151,7 @@ public class JavaInputStreamToXUnitTest {
// tests - InputStream to File
@Test
public final void givenUsingPlainJava_whenConvertingAnFullInputStreamToAFile_thenCorrect() throws IOException {
public final void whenConvertingToFile_thenCorrect() throws IOException {
final InputStream initialStream = new FileInputStream(new File("src/main/resources/sample.txt"));
final byte[] buffer = new byte[initialStream.available()];
initialStream.read(buffer);
@@ -177,7 +165,7 @@ public class JavaInputStreamToXUnitTest {
}
@Test
public final void givenUsingPlainJava_whenConvertingAnInProgressInputStreamToAFile_thenCorrect() throws IOException {
public final void whenConvertingInProgressToFile_thenCorrect() throws IOException {
final InputStream initialStream = new FileInputStream(new File("src/main/resources/sample.txt"));
final File targetFile = new File("src/main/resources/targetFile.tmp");
final OutputStream outStream = new FileOutputStream(targetFile);
@@ -193,7 +181,7 @@ public class JavaInputStreamToXUnitTest {
}
@Test
public final void givenUsingPlainJava8_whenConvertingAnInProgressInputStreamToAFile_thenCorrect() throws IOException {
public final void whenConvertingAnInProgressInputStreamToFile_thenCorrect2() throws IOException {
final InputStream initialStream = new FileInputStream(new File("src/main/resources/sample.txt"));
final File targetFile = new File("src/main/resources/targetFile.tmp");
@@ -203,7 +191,7 @@ public class JavaInputStreamToXUnitTest {
}
@Test
public final void givenUsingGuava_whenConvertingAnInputStreamToAFile_thenCorrect() throws IOException {
public final void whenConvertingInputStreamToFile_thenCorrect3() throws IOException {
final InputStream initialStream = new FileInputStream(new File("src/main/resources/sample.txt"));
final byte[] buffer = new byte[initialStream.available()];
initialStream.read(buffer);
@@ -215,7 +203,7 @@ public class JavaInputStreamToXUnitTest {
}
@Test
public final void givenUsingCommonsIO_whenConvertingAnInputStreamToAFile_thenCorrect() throws IOException {
public final void whenConvertingInputStreamToFile_thenCorrect4() throws IOException {
final InputStream initialStream = FileUtils.openInputStream(new File("src/main/resources/sample.txt"));
final File targetFile = new File("src/main/resources/targetFile.tmp");