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JAVA-2111: Split or move core-java-jvm module (#9688)

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* JAVA-2111: Moved boolean Memory Layout article

* JAVA-2111: Moved Shutdown Hooks article

* JAVA-2111: Updated README files

* JAVA-2111: Fixed prev link
This commit is contained in:
Sampada
2020-07-12 21:05:16 +05:30
committed by GitHub
parent 51d8365312
commit 54380db8d9
5 changed files with 8 additions and 3 deletions
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3
core-java-modules/core-java-jvm/README.md
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@@ -11,8 +11,7 @@ This module contains articles about working with the Java Virtual Machine (JVM).
- [A Guide to System.exit()](https://www.baeldung.com/java-system-exit)
- [Guide to System.gc()](https://www.baeldung.com/java-system-gc)
- [Runtime.getRuntime().halt() vs System.exit() in Java](https://www.baeldung.com/java-runtime-halt-vs-system-exit)
- [Adding Shutdown Hooks for JVM Applications](https://www.baeldung.com/jvm-shutdown-hooks)
- [How to Get the Size of an Object in Java](http://www.baeldung.com/java-size-of-object)
- [What Causes java.lang.OutOfMemoryError: unable to create new native thread](https://www.baeldung.com/java-outofmemoryerror-unable-to-create-new-native-thread)
- [View Bytecode of a Class File in Java](https://www.baeldung.com/java-class-view-bytecode)
- [boolean and boolean[] Memory Layout in the JVM](https://www.baeldung.com/jvm-boolean-memory-layout)
- More articles: [[next -->]](/core-java-modules/core-java-jvm-2)

25
core-java-modules/core-java-jvm/src/test/java/com/baeldung/boolsize/BooleanSizeUnitTest.java
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@@ -1,25 +0,0 @@
package com.baeldung.boolsize;
import org.junit.Test;
import org.openjdk.jol.info.ClassLayout;
import org.openjdk.jol.vm.VM;
public class BooleanSizeUnitTest {
@Test
public void printingTheVMDetails() {
System.out.println(VM.current().details());
}
@Test
public void printingTheBoolWrapper() {
System.out.println(ClassLayout.parseClass(BooleanWrapper.class).toPrintable());
}
@Test
public void printingTheBoolArray() {
boolean[] value = new boolean[3];
System.out.println(ClassLayout.parseInstance(value).toPrintable());
}
}

5
core-java-modules/core-java-jvm/src/test/java/com/baeldung/boolsize/BooleanWrapper.java
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@@ -1,5 +0,0 @@
package com.baeldung.boolsize;
class BooleanWrapper {
private boolean value;
}

47
core-java-modules/core-java-jvm/src/test/java/com/baeldung/shutdownhook/ShutdownHookUnitTest.java
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@@ -1,47 +0,0 @@
package com.baeldung.shutdownhook;
import org.junit.Test;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatThrownBy;
public class ShutdownHookUnitTest {
@Test
public void givenAHook_WhenShutsDown_ThenHookShouldBeExecuted() {
Thread printingHook = new Thread(() -> System.out.println("In the middle of a shutdown"));
Runtime.getRuntime().addShutdownHook(printingHook);
}
@Test
public void addingAHook_WhenThreadAlreadyStarted_ThenThrowsAnException() {
Thread longRunningHook = new Thread(() -> {
try {
Thread.sleep(300);
} catch (InterruptedException ignored) {}
});
longRunningHook.start();
assertThatThrownBy(() -> Runtime.getRuntime().addShutdownHook(longRunningHook))
.isInstanceOf(IllegalArgumentException.class)
.hasMessage("Hook already running");
}
@Test
public void addingAHook_WhenAlreadyExists_ThenAnExceptionWouldBeThrown() {
Thread unfortunateHook = new Thread(() -> {});
Runtime.getRuntime().addShutdownHook(unfortunateHook);
assertThatThrownBy(() -> Runtime.getRuntime().addShutdownHook(unfortunateHook))
.isInstanceOf(IllegalArgumentException.class)
.hasMessage("Hook previously registered");
}
@Test
public void removeAHook_WhenItIsAlreadyRegistered_ThenWouldDeRegisterTheHook() {
Thread willNotRun = new Thread(() -> System.out.println("Won't run!"));
Runtime.getRuntime().addShutdownHook(willNotRun);
assertThat(Runtime.getRuntime().removeShutdownHook(willNotRun)).isTrue();
}
}