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- %!TEX root = Programmierparadigmen.tex
- \chapter{Java}
- \index{Java|(}
- Im Folgenden wird in aller Kürze erklärt, wie man in Java Programme schreibt,
- die auf mehreren Prozessoren laufen.
- \section{Thread, ThreadPool und Runnable}
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
- \texttt{Interface Runnable}\\
- \-\hspace{0.8cm}$\leftharpoonup$ \texttt{java.lang.Thread}\xindex{Runnable}%
- \begin{itemize}
- \item Methods:
- \begin{itemize}
- \item \texttt{void run()}: When an object implementing interface
- Runnable is used to create a thread, starting the thread causes the
- object's run method to be called in that separately executing thread.
- \end{itemize}
- \end{itemize}
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
- \texttt{Class Thread}\\
- \-\hspace{0.8cm}$\leftharpoonup$ \texttt{java.lang.Thread}\xindex{Thread}%
- \begin{itemize}
- \item implements Runnable
- \end{itemize}
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
- \texttt{Class ThreadPoolExecutor}\xindex{ThreadPoolExecutor}\\
- \-\hspace{0.8cm}$\leftharpoonup$ \texttt{java.util.concurrent.ThreadPoolExecutor}
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
- \texttt{Interface Callable<V>}\xindex{Callable}\\
- \-\hspace{0.8cm}$\leftharpoonup$ \texttt{java.util.concurrent}
- \begin{itemize}
- \item Parameter: \texttt{V} - the result type of method call
- \end{itemize}
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
- \section{Futures}\xindex{Future}\index{Promise|see{Future}}
- \enquote{Ein Future (engl. \enquote{Zukunft}) oder ein Promise (engl. \enquote{Versprechen}) bezeichnet in der Programmierung einen Platzhalter (Proxy) für ein Ergebnis, das noch nicht bekannt ist, meist weil seine Berechnung noch nicht abgeschlossen ist.}
- \texttt{Interface Future<V>}\xindex{Future}\\
- \-\hspace{0.8cm}$\leftharpoonup$ \texttt{java.util.concurrent}
- \textbf{Parameter}:
- \begin{itemize}
- \item \texttt{V}: The result type returned by this Future's get method
- \end{itemize}
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
- \textbf{Beispiel}:
- % Zu lang, geht das kürzer?
- %\inputminted[numbersep=5pt, tabsize=4]{java}{scripts/java/matrix-multiplication.java}
- \begin{beispiel}[Runnable, ExecutorService, ThreadPool\footnotemark]
- \inputminted[numbersep=5pt, tabsize=4]{java}{scripts/java/vorlesung-futures-basics.java}
- \end{beispiel}
- \footnotetext{WS 2013/2014, Kapitel 41, Folie 26}
- \section{Literatur}
- \begin{itemize}
- \item \href{http://openbook.galileocomputing.de/javainsel9/javainsel_14_004.htm}{Java ist auch eine Insel}: Kapitel 14 -
- Threads und nebenläufige Programmierung
- \item \href{http://www.vogella.com/tutorials/JavaConcurrency/article.html}{vogella.com}: Java concurrency (multi-threading) - Tutorial
- \item Links zur offiziellen Java 8 Dokumentation:
- \begin{itemize}
- \item \href{http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ThreadPoolExecutor.html}{ThreadPoolExecutor}
- \item \href{http://docs.oracle.com/javase/8/docs/api/java/lang/Runnable.html}{Runnable}
- \item \href{http://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html}{Thread}
- \item \href{http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Callable.html}{Callable}
- \item \href{http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Future.html}{Future}
- \end{itemize}
- \end{itemize}
- \index{Java|)}
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