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Adding shutdown hooks

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Sometimes you need a piece of code to execute when the program stops, such as releasing system resources that you open. You can make a thread run when the program stops with the addShutdownHook method: 

Runtime.getRuntime().addShutdownHook(new Thread(() -> {
    ImportantStuff.someImportantIOStream.close();
}));
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Runtime commands:
* Runtime Commands
* Adding shutdown hooks
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125 Java command: java and javaw
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180 StringBuffer
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183 CompletableFuture
184 Contributors