diff --git a/aws-app-sync/README.md b/aws-app-sync/README.md
new file mode 100644
index 0000000000..976a999f40
--- /dev/null
+++ b/aws-app-sync/README.md
@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [AWS AppSync With Spring Boot](https://www.baeldung.com/aws-appsync-spring)
diff --git a/core-java-modules/core-java-9-new-features/README.md b/core-java-modules/core-java-9-new-features/README.md
index d547b9a221..c2ef63a530 100644
--- a/core-java-modules/core-java-9-new-features/README.md
+++ b/core-java-modules/core-java-9-new-features/README.md
@@ -12,3 +12,4 @@ This module contains articles about core Java features that have been introduced
- [Introduction to Java 9 StackWalking API](https://www.baeldung.com/java-9-stackwalking-api)
- [Java 9 Platform Logging API](https://www.baeldung.com/java-9-logging-api)
- [Java 9 Reactive Streams](https://www.baeldung.com/java-9-reactive-streams)
+- [Multi-Release JAR Files with Maven](https://www.baeldung.com/maven-multi-release-jars)
diff --git a/core-java-modules/core-java-9-new-features/pom.xml b/core-java-modules/core-java-9-new-features/pom.xml
index 23dc659af8..08e52b2990 100644
--- a/core-java-modules/core-java-9-new-features/pom.xml
+++ b/core-java-modules/core-java-9-new-features/pom.xml
@@ -33,8 +33,104 @@
${junit.platform.version}
test
+
+ org.awaitility
+ awaitility
+ ${awaitility.version}
+ test
+
-
+
+
+ incubator-features
+
+ core-java-9-new-features
+
+
+ org.apache.maven.plugins
+ maven-compiler-plugin
+ ${maven-compiler-plugin.version}
+
+ ${maven.compiler.source}
+ ${maven.compiler.target}
+ --add-modules=jdk.incubator.httpclient
+
+
+
+ maven-surefire-plugin
+
+ --add-modules=jdk.incubator.httpclient
+
+
+
+
+
+
+ mrjar-generation
+
+
+
+ org.apache.maven.plugins
+ maven-compiler-plugin
+
+
+ compile-java-8
+
+ compile
+
+
+ 1.8
+ 1.8
+
+ ${project.basedir}/src/main/java8
+
+
+
+
+ compile-java-9
+ compile
+
+ compile
+
+
+ 9
+
+ ${project.basedir}/src/main/java9
+
+ ${project.build.outputDirectory}/META-INF/versions/9
+
+
+
+ default-testCompile
+ test-compile
+
+ testCompile
+
+
+ true
+
+
+
+
+
+ org.apache.maven.plugins
+ maven-jar-plugin
+ ${maven-jar-plugin.version}
+
+
+
+ true
+
+
+ com.baeldung.multireleaseapp.App
+
+
+
+
+
+
+
+
core-java-9-new-features
@@ -61,8 +157,10 @@
3.10.0
1.2.0
+ 4.0.2
1.9
1.9
+ 3.2.0
3.0.0
diff --git a/core-java-modules/core-java-9-new-features/src/main/java8/com/baeldung/multireleaseapp/App.java b/core-java-modules/core-java-9-new-features/src/main/java8/com/baeldung/multireleaseapp/App.java
new file mode 100644
index 0000000000..cc00223e05
--- /dev/null
+++ b/core-java-modules/core-java-9-new-features/src/main/java8/com/baeldung/multireleaseapp/App.java
@@ -0,0 +1,14 @@
+package com.baeldung.multireleaseapp;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class App {
+
+ private static final Logger logger = LoggerFactory.getLogger(App.class);
+
+ public static void main(String[] args) {
+ logger.info(String.format("Running on %s", new DefaultVersion().version()));
+ }
+
+}
diff --git a/core-java-modules/core-java-9-new-features/src/main/java8/com/baeldung/multireleaseapp/DefaultVersion.java b/core-java-modules/core-java-9-new-features/src/main/java8/com/baeldung/multireleaseapp/DefaultVersion.java
new file mode 100644
index 0000000000..b24be606de
--- /dev/null
+++ b/core-java-modules/core-java-9-new-features/src/main/java8/com/baeldung/multireleaseapp/DefaultVersion.java
@@ -0,0 +1,9 @@
+package com.baeldung.multireleaseapp;
+
+public class DefaultVersion implements Version {
+
+ @Override
+ public String version() {
+ return System.getProperty("java.version");
+ }
+}
diff --git a/core-java-modules/core-java-9-new-features/src/main/java8/com/baeldung/multireleaseapp/Version.java b/core-java-modules/core-java-9-new-features/src/main/java8/com/baeldung/multireleaseapp/Version.java
new file mode 100644
index 0000000000..ef95f08205
--- /dev/null
+++ b/core-java-modules/core-java-9-new-features/src/main/java8/com/baeldung/multireleaseapp/Version.java
@@ -0,0 +1,5 @@
+package com.baeldung.multireleaseapp;
+
+interface Version {
+ public String version();
+}
\ No newline at end of file
diff --git a/core-java-modules/core-java-9-new-features/src/main/java9/com/baeldung/multireleaseapp/DefaultVersion.java b/core-java-modules/core-java-9-new-features/src/main/java9/com/baeldung/multireleaseapp/DefaultVersion.java
new file mode 100644
index 0000000000..0842f578dd
--- /dev/null
+++ b/core-java-modules/core-java-9-new-features/src/main/java9/com/baeldung/multireleaseapp/DefaultVersion.java
@@ -0,0 +1,9 @@
+package com.baeldung.multireleaseapp;
+
+public class DefaultVersion implements Version {
+
+ @Override
+ public String version() {
+ return Runtime.version().toString();
+ }
+}
diff --git a/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpClientTest.java b/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpClientIntegrationTest.java
similarity index 98%
rename from core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpClientTest.java
rename to core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpClientIntegrationTest.java
index 5cf3b9098f..fc59ae8d8d 100644
--- a/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpClientTest.java
+++ b/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpClientIntegrationTest.java
@@ -24,7 +24,7 @@ import static org.junit.Assert.assertThat;
/**
* Created by adam.
*/
-public class HttpClientTest {
+public class HttpClientIntegrationTest {
@Test
public void shouldReturnSampleDataContentWhenConnectViaSystemProxy() throws IOException, InterruptedException, URISyntaxException {
@@ -55,7 +55,7 @@ public class HttpClientTest {
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_MOVED_PERM));
- assertThat(response.body(), containsString("https://stackoverflow.com/"));
+ assertThat(response.body(), containsString(""));
}
@Test
diff --git a/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpRequestTest.java b/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpRequestIntegrationTest.java
similarity index 99%
rename from core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpRequestTest.java
rename to core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpRequestIntegrationTest.java
index 7c0e9a90e0..17af7bd8ba 100644
--- a/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpRequestTest.java
+++ b/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpRequestIntegrationTest.java
@@ -22,7 +22,7 @@ import static org.junit.Assert.assertThat;
/**
* Created by adam.
*/
-public class HttpRequestTest {
+public class HttpRequestIntegrationTest {
@Test
public void shouldReturnStatusOKWhenSendGetRequest() throws IOException, InterruptedException, URISyntaxException {
diff --git a/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpResponseTest.java b/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpResponseIntegrationTest.java
similarity index 97%
rename from core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpResponseTest.java
rename to core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpResponseIntegrationTest.java
index 80295ff34c..5c6f9c8a52 100644
--- a/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpResponseTest.java
+++ b/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/httpclient/HttpResponseIntegrationTest.java
@@ -18,7 +18,7 @@ import static org.junit.Assert.assertThat;
/**
* Created by adam.
*/
-public class HttpResponseTest {
+public class HttpResponseIntegrationTest {
@Test
public void shouldReturnStatusOKWhenSendGetRequest() throws IOException, InterruptedException, URISyntaxException {
diff --git a/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/streams.reactive/ReactiveStreamsTest.java b/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/streams/reactive/ReactiveStreamsUnitTest.java
similarity index 86%
rename from core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/streams.reactive/ReactiveStreamsTest.java
rename to core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/streams/reactive/ReactiveStreamsUnitTest.java
index 647557532d..92cdc1c074 100644
--- a/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/streams.reactive/ReactiveStreamsTest.java
+++ b/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/streams/reactive/ReactiveStreamsUnitTest.java
@@ -5,10 +5,12 @@ import org.junit.Test;
import java.util.List;
import java.util.concurrent.SubmissionPublisher;
+import java.util.concurrent.TimeUnit;
-import static org.assertj.core.api.Java6Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.awaitility.Awaitility.await;
-public class ReactiveStreamsTest {
+public class ReactiveStreamsUnitTest {
@Test
public void givenPublisher_whenSubscribeToIt_thenShouldConsumeAllElements() throws InterruptedException {
@@ -25,7 +27,7 @@ public class ReactiveStreamsTest {
//then
- await().atMost(1000, TimeUnit.MILLISECONDS).until(
+ await().atMost(1000, TimeUnit.MILLISECONDS).untilAsserted(
() -> assertThat(subscriber.consumedElements).containsExactlyElementsOf(items)
);
}
@@ -46,7 +48,7 @@ public class ReactiveStreamsTest {
publisher.close();
//then
- await().atMost(1000, TimeUnit.MILLISECONDS).until(
+ await().atMost(1000, TimeUnit.MILLISECONDS).untilAsserted(
() -> assertThat(subscriber.consumedElements).containsExactlyElementsOf(expectedResult)
);
}
@@ -66,7 +68,7 @@ public class ReactiveStreamsTest {
publisher.close();
//then
- await().atMost(1000, TimeUnit.MILLISECONDS).until(
+ await().atMost(1000, TimeUnit.MILLISECONDS).untilAsserted(
() -> assertThat(subscriber.consumedElements).containsExactlyElementsOf(expected)
);
}
diff --git a/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/varhandles/VariableHandlesTest.java b/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/varhandles/VariableHandlesUnitTest.java
similarity index 75%
rename from core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/varhandles/VariableHandlesTest.java
rename to core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/varhandles/VariableHandlesUnitTest.java
index 50766502ec..56e34f06a0 100644
--- a/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/varhandles/VariableHandlesTest.java
+++ b/core-java-modules/core-java-9-new-features/src/test/java/com/baeldung/java9/varhandles/VariableHandlesUnitTest.java
@@ -7,7 +7,7 @@ import java.lang.invoke.VarHandle;
import static org.assertj.core.api.Assertions.assertThat;
-public class VariableHandlesTest {
+public class VariableHandlesUnitTest {
public int publicTestVariable = 1;
private int privateTestVariable = 1;
@@ -20,22 +20,22 @@ public class VariableHandlesTest {
public void whenVariableHandleForPublicVariableIsCreated_ThenItIsInitializedProperly() throws NoSuchFieldException, IllegalAccessException {
VarHandle publicIntHandle = MethodHandles
.lookup()
- .in(VariableHandlesTest.class)
- .findVarHandle(VariableHandlesTest.class, "publicTestVariable", int.class);
+ .in(VariableHandlesUnitTest.class)
+ .findVarHandle(VariableHandlesUnitTest.class, "publicTestVariable", int.class);
assertThat(publicIntHandle.coordinateTypes().size() == 1);
- assertThat(publicIntHandle.coordinateTypes().get(0) == VariableHandles.class);
+ assertThat(publicIntHandle.coordinateTypes().get(0) == VariableHandlesUnitTest.class);
}
@Test
public void whenVariableHandleForPrivateVariableIsCreated_ThenItIsInitializedProperly() throws NoSuchFieldException, IllegalAccessException {
VarHandle privateIntHandle = MethodHandles
- .privateLookupIn(VariableHandlesTest.class, MethodHandles.lookup())
- .findVarHandle(VariableHandlesTest.class, "privateTestVariable", int.class);
+ .privateLookupIn(VariableHandlesUnitTest.class, MethodHandles.lookup())
+ .findVarHandle(VariableHandlesUnitTest.class, "privateTestVariable", int.class);
assertThat(privateIntHandle.coordinateTypes().size() == 1);
- assertThat(privateIntHandle.coordinateTypes().get(0) == VariableHandlesTest.class);
+ assertThat(privateIntHandle.coordinateTypes().get(0) == VariableHandlesUnitTest.class);
}
@@ -52,8 +52,8 @@ public class VariableHandlesTest {
public void givenVarHandle_whenGetIsInvoked_ThenValueOfVariableIsReturned() throws NoSuchFieldException, IllegalAccessException {
VarHandle publicIntHandle = MethodHandles
.lookup()
- .in(VariableHandlesTest.class)
- .findVarHandle(VariableHandlesTest.class, "publicTestVariable", int.class);
+ .in(VariableHandlesUnitTest.class)
+ .findVarHandle(VariableHandlesUnitTest.class, "publicTestVariable", int.class);
assertThat((int) publicIntHandle.get(this) == 1);
}
@@ -62,8 +62,8 @@ public class VariableHandlesTest {
public void givenVarHandle_whenSetIsInvoked_ThenValueOfVariableIsChanged() throws NoSuchFieldException, IllegalAccessException {
VarHandle publicIntHandle = MethodHandles
.lookup()
- .in(VariableHandlesTest.class)
- .findVarHandle(VariableHandlesTest.class, "variableToSet", int.class);
+ .in(VariableHandlesUnitTest.class)
+ .findVarHandle(VariableHandlesUnitTest.class, "variableToSet", int.class);
publicIntHandle.set(this, 15);
assertThat((int) publicIntHandle.get(this) == 15);
@@ -73,8 +73,8 @@ public class VariableHandlesTest {
public void givenVarHandle_whenCompareAndSetIsInvoked_ThenValueOfVariableIsChanged() throws NoSuchFieldException, IllegalAccessException {
VarHandle publicIntHandle = MethodHandles
.lookup()
- .in(VariableHandlesTest.class)
- .findVarHandle(VariableHandlesTest.class, "variableToCompareAndSet", int.class);
+ .in(VariableHandlesUnitTest.class)
+ .findVarHandle(VariableHandlesUnitTest.class, "variableToCompareAndSet", int.class);
publicIntHandle.compareAndSet(this, 1, 100);
assertThat((int) publicIntHandle.get(this) == 100);
@@ -84,8 +84,8 @@ public class VariableHandlesTest {
public void givenVarHandle_whenGetAndAddIsInvoked_ThenValueOfVariableIsChanged() throws NoSuchFieldException, IllegalAccessException {
VarHandle publicIntHandle = MethodHandles
.lookup()
- .in(VariableHandlesTest.class)
- .findVarHandle(VariableHandlesTest.class, "variableToGetAndAdd", int.class);
+ .in(VariableHandlesUnitTest.class)
+ .findVarHandle(VariableHandlesUnitTest.class, "variableToGetAndAdd", int.class);
int before = (int) publicIntHandle.getAndAdd(this, 200);
assertThat(before == 0);
@@ -96,8 +96,8 @@ public class VariableHandlesTest {
public void givenVarHandle_whenGetAndBitwiseOrIsInvoked_ThenValueOfVariableIsChanged() throws NoSuchFieldException, IllegalAccessException {
VarHandle publicIntHandle = MethodHandles
.lookup()
- .in(VariableHandlesTest.class)
- .findVarHandle(VariableHandlesTest.class, "variableToBitwiseOr", byte.class);
+ .in(VariableHandlesUnitTest.class)
+ .findVarHandle(VariableHandlesUnitTest.class, "variableToBitwiseOr", byte.class);
byte before = (byte) publicIntHandle.getAndBitwiseOr(this, (byte) 127);
assertThat(before == 0);
diff --git a/core-java-modules/core-java-io-conversions-2/README.md b/core-java-modules/core-java-io-conversions-2/README.md
index 5cb9c21c54..9ce36e7437 100644
--- a/core-java-modules/core-java-io-conversions-2/README.md
+++ b/core-java-modules/core-java-io-conversions-2/README.md
@@ -5,4 +5,5 @@ This module contains articles about core Java input/output(IO) conversions.
### Relevant Articles:
- [Java InputStream to String](https://www.baeldung.com/convert-input-stream-to-string)
- [Java – Write an InputStream to a File](https://www.baeldung.com/convert-input-stream-to-a-file)
+- [Converting a BufferedReader to a JSONObject](https://www.baeldung.com/java-bufferedreader-to-jsonobject)
- More articles: [[<-- prev]](/core-java-modules/core-java-io-conversions)
diff --git a/core-java-modules/core-java-io-conversions-2/pom.xml b/core-java-modules/core-java-io-conversions-2/pom.xml
index 5312ad645d..46bce7988b 100644
--- a/core-java-modules/core-java-io-conversions-2/pom.xml
+++ b/core-java-modules/core-java-io-conversions-2/pom.xml
@@ -21,6 +21,11 @@
commons-lang3
${commons-lang3.version}
+
+ org.json
+ json
+ 20200518
+
diff --git a/core-java-modules/core-java-io-conversions-2/src/test/java/com/baeldung/bufferedreadertojsonobject/JavaBufferedReaderToJSONObjectUnitTest.java b/core-java-modules/core-java-io-conversions-2/src/test/java/com/baeldung/bufferedreadertojsonobject/JavaBufferedReaderToJSONObjectUnitTest.java
new file mode 100644
index 0000000000..80007e9c2f
--- /dev/null
+++ b/core-java-modules/core-java-io-conversions-2/src/test/java/com/baeldung/bufferedreadertojsonobject/JavaBufferedReaderToJSONObjectUnitTest.java
@@ -0,0 +1,48 @@
+package com.baeldung.bufferedreadertojsonobject;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+import java.io.BufferedReader;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+
+import org.json.JSONObject;
+import org.json.JSONTokener;
+import org.junit.Test;
+
+public class JavaBufferedReaderToJSONObjectUnitTest {
+
+ @Test
+ public void givenValidJson_whenUsingBufferedReader_thenJSONTokenerConverts() {
+ byte[] b = "{ \"name\" : \"John\", \"age\" : 18 }".getBytes(StandardCharsets.UTF_8);
+ InputStream is = new ByteArrayInputStream(b);
+ BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(is));
+ JSONTokener tokener = new JSONTokener(bufferedReader);
+ JSONObject json = new JSONObject(tokener);
+
+ assertNotNull(json);
+ assertEquals("John", json.get("name"));
+ assertEquals(18, json.get("age"));
+ }
+
+ @Test
+ public void givenValidJson_whenUsingString_thenJSONObjectConverts() throws IOException {
+ byte[] b = "{ \"name\" : \"John\", \"age\" : 18 }".getBytes(StandardCharsets.UTF_8);
+ InputStream is = new ByteArrayInputStream(b);
+ BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(is));
+ StringBuilder sb = new StringBuilder();
+ String line;
+ while ((line = bufferedReader.readLine()) != null) {
+ sb.append(line);
+ }
+ JSONObject json = new JSONObject(sb.toString());
+
+ assertNotNull(json);
+ assertEquals("John", json.get("name"));
+ assertEquals(18, json.get("age"));
+ }
+}
diff --git a/core-java-modules/core-java-jvm/src/test/java/com/baeldung/error/oom/ExecutorServiceUnitTest.java b/core-java-modules/core-java-jvm/src/test/java/com/baeldung/error/oom/ExecutorServiceUnitTest.java
new file mode 100644
index 0000000000..47bb668727
--- /dev/null
+++ b/core-java-modules/core-java-jvm/src/test/java/com/baeldung/error/oom/ExecutorServiceUnitTest.java
@@ -0,0 +1,40 @@
+package com.baeldung.error.oom;
+
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.IntStream;
+
+import org.junit.jupiter.api.Test;
+
+public class ExecutorServiceUnitTest {
+
+ @Test
+ public void givenAnExecutorService_WhenMoreTasksSubmitted_ThenAdditionalTasksWait() {
+
+ // Given
+ int noOfThreads = 5;
+ ExecutorService executorService = Executors.newFixedThreadPool(noOfThreads);
+
+ Runnable runnableTask = () -> {
+ try {
+ TimeUnit.HOURS.sleep(1);
+ } catch (InterruptedException e) {
+ e.printStackTrace();
+ }
+ };
+
+ // When
+ IntStream.rangeClosed(1, 10)
+ .forEach(i -> executorService.submit(runnableTask));
+
+ // Then
+ assertThat(((ThreadPoolExecutor) executorService).getQueue()
+ .size(), is(equalTo(5)));
+ }
+}
diff --git a/core-java-modules/core-java-lang-2/src/main/java/com/baeldung/inttoenum/PizzaStatus.java b/core-java-modules/core-java-lang-2/src/main/java/com/baeldung/inttoenum/PizzaStatus.java
new file mode 100644
index 0000000000..8d7c626521
--- /dev/null
+++ b/core-java-modules/core-java-lang-2/src/main/java/com/baeldung/inttoenum/PizzaStatus.java
@@ -0,0 +1,36 @@
+package com.baeldung.inttoenum;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public enum PizzaStatus {
+ ORDERED(5),
+ READY(2),
+ DELIVERED(0);
+
+ private int timeToDelivery;
+
+ PizzaStatus(int timeToDelivery) {
+ this.timeToDelivery = timeToDelivery;
+ }
+
+ public int getTimeToDelivery() {
+ return timeToDelivery;
+ }
+
+ private static Map timeToDeliveryToEnumValuesMapping = new HashMap<>();
+
+ static {
+ PizzaStatus[] pizzaStatuses = PizzaStatus.values();
+ for (int pizzaStatusIndex = 0; pizzaStatusIndex < pizzaStatuses.length; pizzaStatusIndex++) {
+ timeToDeliveryToEnumValuesMapping.put(
+ pizzaStatuses[pizzaStatusIndex].getTimeToDelivery(),
+ pizzaStatuses[pizzaStatusIndex]
+ );
+ }
+ }
+
+ public static PizzaStatus castIntToEnum(int timeToDelivery) {
+ return timeToDeliveryToEnumValuesMapping.get(timeToDelivery);
+ }
+}
\ No newline at end of file
diff --git a/core-java-modules/core-java-lang-2/src/test/java/com/baeldung/inttoenum/IntToEnumUnitTest.java b/core-java-modules/core-java-lang-2/src/test/java/com/baeldung/inttoenum/IntToEnumUnitTest.java
new file mode 100644
index 0000000000..876c230827
--- /dev/null
+++ b/core-java-modules/core-java-lang-2/src/test/java/com/baeldung/inttoenum/IntToEnumUnitTest.java
@@ -0,0 +1,27 @@
+package com.baeldung.inttoenum;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class IntToEnumUnitTest {
+
+ @Test
+ public void whenIntToEnumUsingValuesMethod_thenReturnEnumObject() {
+ int timeToDeliveryForOrderedPizzaStatus = 5;
+ PizzaStatus[] pizzaStatuses = PizzaStatus.values();
+ PizzaStatus pizzaOrderedStatus = null;
+ for (int pizzaStatusIndex = 0; pizzaStatusIndex < pizzaStatuses.length; pizzaStatusIndex++) {
+ if (pizzaStatuses[pizzaStatusIndex].getTimeToDelivery() == timeToDeliveryForOrderedPizzaStatus) {
+ pizzaOrderedStatus = pizzaStatuses[pizzaStatusIndex];
+ }
+ }
+ assertEquals(pizzaOrderedStatus, PizzaStatus.ORDERED);
+ }
+
+ @Test
+ public void whenIntToEnumUsingMap_thenReturnEnumObject() {
+ int timeToDeliveryForOrderedPizzaStatus = 5;
+ assertEquals(PizzaStatus.castIntToEnum(timeToDeliveryForOrderedPizzaStatus), PizzaStatus.ORDERED);
+ }
+}
\ No newline at end of file
diff --git a/core-java-modules/core-java-lang-oop-generics/src/main/java/com/baeldung/supertype/TypeReference.java b/core-java-modules/core-java-lang-oop-generics/src/main/java/com/baeldung/supertype/TypeReference.java
new file mode 100644
index 0000000000..2021f42239
--- /dev/null
+++ b/core-java-modules/core-java-lang-oop-generics/src/main/java/com/baeldung/supertype/TypeReference.java
@@ -0,0 +1,18 @@
+package com.baeldung.supertype;
+
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+
+public abstract class TypeReference {
+
+ private final Type type;
+
+ public TypeReference() {
+ Type superclass = getClass().getGenericSuperclass();
+ type = ((ParameterizedType) superclass).getActualTypeArguments()[0];
+ }
+
+ public Type getType() {
+ return type;
+ }
+}
diff --git a/core-java-modules/core-java-lang-oop-generics/src/test/java/com/baeldung/supertype/TypeReferenceUnitTest.java b/core-java-modules/core-java-lang-oop-generics/src/test/java/com/baeldung/supertype/TypeReferenceUnitTest.java
new file mode 100644
index 0000000000..24e3b698e2
--- /dev/null
+++ b/core-java-modules/core-java-lang-oop-generics/src/test/java/com/baeldung/supertype/TypeReferenceUnitTest.java
@@ -0,0 +1,24 @@
+package com.baeldung.supertype;
+
+import org.junit.Test;
+
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+import java.util.Map;
+
+import static org.junit.Assert.assertEquals;
+
+public class TypeReferenceUnitTest {
+
+ @Test
+ public void givenGenericToken_whenUsingSuperTypeToken_thenPreservesTheTypeInfo() {
+ TypeReference