Purpose

Prevents forgetting to delete temporary files and quitting without deleting files at the time of abnormal termination.

Implementation example

Delete file using delete statement

`Delete temporary file with delete statement`


    Path path = null;
    try {
        //Temporary file creation
        path = Files.createTempFile("test", ".tmp");
        OutputStream out = Files.newOutputStream(path);
        String data = "test";
        out.write(data.getBytes());

        //Write to file
        out.flush();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        //File deletion at the end of processing
        Files.deleteIfExists(path);
    }

In this implementation, it seems that it may not be deleted when the JVM terminates abnormally.

Delete files using DELETE_ON_CLOSE

`DELETE_ON_Delete temporary files using CLOSE`


    Path path = null;
    try {
        //Temporary file creation
        path = Files.createTempFile("test", ".temp");
        try (BufferedWriter bw = Files.newBufferedWriter(path, StandardOpenOption.DELETE_ON_CLOSE)) {
            String data = "test";
            //Write to file
            bw.write(data);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }

When DELETE_ON_CLOSE of StandardOpenOption is used as an option when opening a file, Files are automatically deleted when the stream is closed. Furthermore, by using the "try-with-resources" syntax, closing and file deletion are automatically executed without implementing the close process, so the implementation is neat and there is no omission of deletion.

[Java 7 or later] Prevent temporary file deletion omissions