try-with-resource是否有可能无法关闭资源？(Is it possible for try-with-resource to fail to close resources?)

 根据Oracle文档 
 
 
 
 try-with-resources语句是一个声明一个或多个资源的try语句。 资源是一个对象，必须在程序完成后关闭它。 try-with-resources语句确保在语句结束时关闭每个资源。 实现java.lang.AutoCloseable的任何对象（包括实现java.io.Closeable的所有对象）都可以用作资源 
 
 
 如果资源没有实现AutoCloseable，它不能在try块中声明，它必须在body部分声明并且必须在finally块中显式关闭。 try-with-resource是否有可能无法清理资源，除非您使用不正确的习惯用法，如果有嵌套资源并且close（）调用对底层资源不是幂等的？ 我理解的是try-with-resource只能确保在场景后面调用close（），但如果close本身不关闭底层资源，try-with-resource将无法清理资源。 有没有人有相反的观点或更多的澄清？ 

As per Oracle documentation
 
 
 
The try-with-resources statement is a try statement that declares one or more resources. A resource is as an object that must be closed after the program is finished with it. The try-with-resources statement ensures that each resource is closed at the end of the statement. Any object that implements java.lang.AutoCloseable, which includes all objects which implement java.io.Closeable, can be used as a resource
 
 
If a resource does not implement AutoCloseable it cannot be declared within try block, it has to be declared in the body part & has to be explicitly closed in finally block. Is it possible for try-with-resource to fail to clean up resources unless you use the idiom incorrectly like if there are nested resources & close() call is not idempotent for the underlying resource? What I understand is try-with-resource only ensures close() getting called behind the scene, but if close itself does not close underlying resources try-with-resource will remain ineffective to clean-up resources. Does anyone have a contrary view or more clarification?

原文：https://stackoverflow.com/questions/36831233