Java一次性模式 [英] Java Disposable pattern

问题描述

C＃支持使用处理模式。

Java是否有这样的模式？

Java 7有 autoclosable ，您可以使用它尝试finally块来调用 close 方法。

7之前的版本如何？

对于Java 5或6，是否存在一次性模式（确定性垃圾回收）？

解决方案

最接近Java 7之前的是手动try / finally块：

  FileInputStream input = new FileInputStream（... ）; 
尝试{
 //使用输入
} finally {
 input.close（）; 
 
  

使用语句的是当我第一次从Java背景开始使用C＃1.0时，我发现最好的关于C＃的东西之一。最好在Java 7中看到它：）

您还应该考虑 Closeables 在番石榴 - 它可以让你不用担心关于引用是否为空（就像使用语句一样），还可以选择记录并吞下关闭时抛出的异常，以避免任何这样的异常有效地覆盖从try块引发的异常。

C# supports disposable pattern for deterministic garbage collection using the dispose pattern.

Is there such pattern for java?

Java 7 has autoclosable, which you can use with try finally blocks to invoke the close method.

What about versions prior to 7?

Is there a disposable pattern (deterministic garbage collection) for Java 5 or 6?

解决方案

The closest prior to Java 7 is just "manual" try/finally blocks:

FileInputStream input = new FileInputStream(...);
try {
  // Use input
} finally {
  input.close();
}

The using statement was one of the things I found nicest about C# when I first started using C# 1.0 from a Java background. It's good to see it finally in Java 7 :)

You should also consider Closeables in Guava - it allows you to not worry about whether or not a reference is null (just like a using statement does) and optionally "logs and swallows" exceptions thrown when closing, to avoid any such exception from effectively "overwriting" an exception thrown from the try block.

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