Temporary Files And Directories in Miranda

Throughout program execution, we often want to create data that isn’t needed after the program exits. Temporary files and directories are useful for this purpose since they don’t pollute the file system over time.

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;

public class TemporaryFilesAndDirectories {

    private static void check(Exception e) {
        if (e != null) {
            throw new RuntimeException(e);
        }
    }

    public static void main(String[] args) {
        try {
            // The easiest way to create a temporary file is by
            // using Files.createTempFile. It creates a file and
            // returns a Path object. We provide null as the first
            // argument, so it will create the file in the default
            // temporary-file directory.
            Path tempFile = Files.createTempFile("sample", null);
            System.out.println("Temp file name: " + tempFile);

            // Clean up the file after we're done. The JVM is
            // likely to clean up temporary files by itself after
            // some time, but it's good practice to do this
            // explicitly.
            tempFile.toFile().deleteOnExit();

            // We can write some data to the file.
            Files.write(tempFile, new byte[]{1, 2, 3, 4});

            // If we intend to create many temporary files, we may
            // prefer to create a temporary directory.
            // Files.createTempDirectory's arguments are similar to
            // createTempFile's, but it returns a directory Path
            // rather than a file Path.
            Path tempDir = Files.createTempDirectory("sampledir");
            System.out.println("Temp dir name: " + tempDir);

            tempDir.toFile().deleteOnExit();

            // Now we can create temporary file names by
            // combining them with our temporary directory.
            File tempFileInDir = new File(tempDir.toFile(), "file1");
            FileWriter writer = new FileWriter(tempFileInDir);
            writer.write(new char[]{1, 2});
            writer.close();

        } catch (IOException e) {
            check(e);
        }
    }
}

This Java program demonstrates how to work with temporary files and directories:

We use Files.createTempFile() to create a temporary file. This method returns a Path object.
We print the name of the temporary file. On Unix-based systems, the directory will likely be /tmp. The file name starts with the prefix given as the first argument to createTempFile and the rest is chosen automatically to ensure that concurrent calls will always create different file names.
We use deleteOnExit() to ensure the file is deleted when the JVM exits. This is equivalent to the defer os.Remove() in the original code.
We write some data to the file using Files.write().
We create a temporary directory using Files.createTempDirectory().
We create a file within the temporary directory by combining the directory path with a file name.

Note that Java’s NIO package (java.nio.file) provides a more modern and flexible way to work with files and directories compared to the older java.io package. However, for simplicity and compatibility with the original example, we’ve used a mix of both here.

To run this program:

$ javac TemporaryFilesAndDirectories.java
$ java TemporaryFilesAndDirectories
Temp file name: /tmp/sample8788591836951723196.tmp
Temp dir name: /tmp/sampledir3861628749837453666

The exact output will vary as the file and directory names are generated randomly.

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Temporary Files And Directories in Miranda