Difference between revisions of "Java home"
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| + | == Runtime Environments == |
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| − | ==Rules Engines== |
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| − | === |
+ | === Links === |
| + | *http://java.sun.com/j2se/codenames.html |
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| + | *http://java.sun.com/products/archive/ |
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| + | |||
| + | == Tips and Tricks == |
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| + | *[http://ostermiller.org/convert_java_outputstream_inputstream.html input and output streams] |
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| + | *[http://www.petefreitag.com/articles/gctuning/ java memory and garbage collector tuning] |
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| + | |||
| + | == Rules Engines == |
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| + | === Overview === |
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Business Rules Management Systems (BRMS), decision tables (''Entscheidungstabellen'') |
Business Rules Management Systems (BRMS), decision tables (''Entscheidungstabellen'') |
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| − | ===Links=== |
+ | === Links === |
*information |
*information |
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**http://www.javarules.org |
**http://www.javarules.org |
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**http://fit-for-rules.sourceforge.net/ |
**http://fit-for-rules.sourceforge.net/ |
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**http://web.openwfe.org/ |
**http://web.openwfe.org/ |
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| + | |||
| + | == JUnit == |
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| + | === Version Info === |
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| + | Manchmal möchte man die Version einer junit-JAR herausbekommen. |
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| + | Das manifest enthält keine Versionskennzeichnung und die Klasse Version besitzt keine Main-Methode. |
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| + | Also braucht man eine kleine Klasse, die die Version auslesen kann. |
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| + | |||
| + | <pre> |
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| + | import junit.runner.Version; |
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| + | public class JUnitVersion { |
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| + | public static void main(String[] args) { |
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| + | System.out.println(Version.id()); |
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| + | } |
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| + | } |
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| + | </pre> |
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| + | |||
| + | == Thread Dumps == |
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| + | Zum Erzeugen eines Thread Dumps muss man seit JDK 1.5 kein SIGQUIT (kill -3 ...) an die JavaVM schicken, sondern es gibt ein eigenes Kommando daf+r |
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| + | |||
| + | jstack <pid> >stack.txt |
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| + | |||
| + | === Links === |
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| + | *http://rfeest.blogspot.com/2008/02/thread-dumps-erzeugen.html |
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| + | *[https://tda.dev.java.net/ Thread Dump Analyzer] |
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| + | *[http://www.tagtraum.com/gcviewer.html free open source tool to visualize garbage collector data] |
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| + | *[https://visualvm.dev.java.net/ All-in-One Java Troubleshooting Tool] |
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| + | |||
| + | == Exceptions == |
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| + | === Links === |
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| + | *http://www.mindview.net/Etc/Discussions/CheckedExceptions |
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| + | |||
| + | == Klonen von Objekten == |
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| + | Um bitweise Kopien von Objekten zu erzeugen, kann man die clone-Methode der Klasse Object verwenden. |
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| + | Dafür muss die zu klonende Klasse das Interface Clonable implementieren. |
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| + | <pre> |
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| + | public class MyClass implements Cloneable { |
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| + | } |
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| + | </pre> |
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| + | |||
| + | <pre> |
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| + | /** Objekt clonen (unter Verwendung von Object.clone()). |
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| + | * @see java.lang.Object#clone() |
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| + | * @return Clone oder null, falls Object.clone() CloneNotSupportedException lieferte |
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| + | */ |
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| + | public MyClass clone() { |
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| + | try { |
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| + | return (MyClass) super.clone(); |
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| + | } catch (CloneNotSupportedException e) { |
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| + | return null; |
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| + | } |
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| + | } |
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| + | </pre> |
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| + | |||
| + | === Links === |
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| + | *http://angelikalanger.com/Articles/JavaSpektrum/05.Clone-Part1/05.Clone-Part1.html |
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| + | *http://angelikalanger.com/Articles/JavaSpektrum/06.Clone-Part2/06.Clone-Part2.html |
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| + | *http://angelikalanger.com/Articles/JavaSpektrum/07.Clone-Part3/07.Clone-Part3.html |
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Latest revision as of 19:40, 16 Februar 2009
Inhaltsverzeichnis
Runtime Environments
Links
Tips and Tricks
Rules Engines
Overview
Business Rules Management Systems (BRMS), decision tables (Entscheidungstabellen)
Links
- information
- standards
- implementations
JUnit
Version Info
Manchmal möchte man die Version einer junit-JAR herausbekommen. Das manifest enthält keine Versionskennzeichnung und die Klasse Version besitzt keine Main-Methode. Also braucht man eine kleine Klasse, die die Version auslesen kann.
import junit.runner.Version;
public class JUnitVersion {
public static void main(String[] args) {
System.out.println(Version.id());
}
}
Thread Dumps
Zum Erzeugen eines Thread Dumps muss man seit JDK 1.5 kein SIGQUIT (kill -3 ...) an die JavaVM schicken, sondern es gibt ein eigenes Kommando daf+r
jstack <pid> >stack.txt
Links
- http://rfeest.blogspot.com/2008/02/thread-dumps-erzeugen.html
- Thread Dump Analyzer
- free open source tool to visualize garbage collector data
- All-in-One Java Troubleshooting Tool
Exceptions
Links
Klonen von Objekten
Um bitweise Kopien von Objekten zu erzeugen, kann man die clone-Methode der Klasse Object verwenden. Dafür muss die zu klonende Klasse das Interface Clonable implementieren.
public class MyClass implements Cloneable {
}
/** Objekt clonen (unter Verwendung von Object.clone()).
* @see java.lang.Object#clone()
* @return Clone oder null, falls Object.clone() CloneNotSupportedException lieferte
*/
public MyClass clone() {
try {
return (MyClass) super.clone();
} catch (CloneNotSupportedException e) {
return null;
}
}
