43 lines
1.6 KiB
Markdown
43 lines
1.6 KiB
Markdown
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+++
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title = "resources"
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draft = false
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tags = [
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"code",
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"java",
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"resources"
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]
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date = "2014-01-29"
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+++
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# Resource handling
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## Opkuisen in try/finally block
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Vanaf **Java 7** zit er ook ARM (automatic resource block management) in met een aanpassing op de `try` blocks:
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```java
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try (
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FileInputStream stockQuoteReader = new FileInputStream("StockQuotes.txt");
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FileOutputStream stockQuoteWriter = new FileOutputStream("StockQuotes.txt")
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) {
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int var;
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while((var###### stockQuoteReader.read()) ! -1 )
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stockQuoteWriter.write();
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}
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```
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> The new construct extends try blocks to declare resources much like is the case with for loops. Any resource declared within a try block opening will be closed. Hence, the new construct shields you from having to pair try blocks with corresponding finally blocks that are dedicated to proper resource management. A semicolon separates each resource
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Zie ook: http:*javarevisited.blogspot.com/2011/09/arm-automatic-resource-management-in.html#ixzz2rnNBbT9G en http:*www.oracle.com/technetwork/articles/java/trywithresources-401775.html
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Opgelet:
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1. Whatever resource we are using should be subtypes of **AutoCloseable** other wise will get compile time error.
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2. The resources which we are using are closed in reverse order means stockQuoteWriter.close() will be called first then stockQuoteReader.close().
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Read more: http://javarevisited.blogspot.com/2011/09/arm-automatic-resource-management-in.html#ixzz2rnNnTi8b
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#### Java VS C#
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Zie [csharp resources wiki pagina]({{< relref "wiki/code/csharp/resources.md" >}})
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`AutoClosable` is een interface die te vergelijken is met `IDisposable` in C#.
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