Temporary Files And Directories in Logo

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.FileOutputStream;
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 in Java is by
            // using Files.createTempFile(). It creates a file and
            // returns its path. 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 Java Runtime 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.
            Path tempDir = Files.createTempDirectory("sampledir");
            System.out.println("Temp dir name: " + tempDir);

            tempDir.toFile().deleteOnExit();

            // Now we can create files in our temporary directory.
            File file1 = new File(tempDir.toFile(), "file1");
            FileOutputStream fos = new FileOutputStream(file1);
            fos.write(new byte[]{1, 2});
            fos.close();

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

To run the program:

$ javac TemporaryFilesAndDirectories.java
$ java TemporaryFilesAndDirectories
Temp file name: /tmp/sample8788591200617131109.tmp
Temp dir name: /tmp/sampledir16735815816373330717

In this Java version, we use the java.nio.file.Files class to create temporary files and directories. The createTempFile() and createTempDirectory() methods are used instead of the Go os.CreateTemp() and os.MkdirTemp() functions.

We use deleteOnExit() to ensure that temporary files and directories are deleted when the Java Virtual Machine terminates. This is similar to the defer os.Remove() calls in the original Go code.

For writing to files, we use Files.write() for the temporary file and FileOutputStream for the file in the temporary directory. These achieve the same result as the f.Write() and os.WriteFile() calls in Go.

The error handling is done using a try-catch block, which is more idiomatic in Java compared to the explicit error checking in Go.

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Temporary Files And Directories in Logo