java - If it safe to return an InputStream from try-with-resource -

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• try-with-resources , return statements in java 2 answers

is safe return input stream try-with-resource statement handle closing of stream once caller has consumed it?

public static inputstream example() throws ioexception {     ...     try (inputstream = ...) {         return is;     } } 

it's safe, closed, don't think particularly useful... (you can't reopen closed stream.)

see example:

public static void main(string[] argv) throws exception {     system.out.println(example()); }  public static inputstream example() throws ioexception {     try (inputstream = files.newinputstream(paths.get("test.txt"))) {         system.out.println(is);         return is;     } } 

output:

sun.nio.ch.channelinputstream@1db9742 sun.nio.ch.channelinputstream@1db9742 

the (same) input stream returned (same reference), closed. modifying example this:

public static void main(string[] argv) throws exception {     inputstream = example();     system.out.println(is + " " + is.available()); }  public static inputstream example() throws ioexception {     try (inputstream = files.newinputstream(paths.get("test.txt"))) {         system.out.println(is + " " + is.available());         return is;     } } 

output:

sun.nio.ch.channelinputstream@1db9742 1000000 exception in thread "main" java.nio.channels.closedchannelexception     @ sun.nio.ch.filechannelimpl.ensureopen(filechannelimpl.java:109)     @ sun.nio.ch.filechannelimpl.size(filechannelimpl.java:299)     @ sun.nio.ch.channelinputstream.available(channelinputstream.java:116)     @ sandbox.app.main.main(main.java:13)