How does java include fault capture information in detailed messages

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Include fault capture information private OutputStream openOutputStream (File file) throws IOException {if (file.exists ()) {if (file.isDirectory ()) {throw new IOException ("File'" + file + "'exists but is a directory");} if (! file.canWrite ()) {throw new IOException ("File'" + file + "'cannot be written to") in the detailed message }} else {final File parent = file.getParentFile (); if (parent! = null) {if (! parent.mkdirs () & &! parent.isDirectory ()) {throw new IOException ("Directory'" + parent + "'could not be created");}} return new FileOutputStream (file, false);}

In this method, IOException uses different strings to pass different fault capture information.

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