Directories in Miranda

Here’s the translation of the Go code to Java, with explanations in Markdown format suitable for Hugo:

Our first program will demonstrate working with directories in the file system. Here’s the full source code:

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

public class Directories {

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

    public static void main(String[] args) {
        // Create a new sub-directory in the current working directory.
        File subdir = new File("subdir");
        boolean created = subdir.mkdir();
        if (!created) {
            System.out.println("Failed to create directory");
            return;
        }

        // When creating temporary directories, it's good practice to delete them when done.
        // We'll use a try-with-resources to ensure cleanup.
        try {
            // Helper method to create a new empty file.
            createEmptyFile("subdir/file1");

            // We can create a hierarchy of directories, including parents.
            // This is similar to the command-line `mkdir -p`.
            File parentChild = new File("subdir/parent/child");
            parentChild.mkdirs();

            createEmptyFile("subdir/parent/file2");
            createEmptyFile("subdir/parent/file3");
            createEmptyFile("subdir/parent/child/file4");

            // list directory contents
            File parentDir = new File("subdir/parent");
            System.out.println("Listing subdir/parent");
            for (File entry : parentDir.listFiles()) {
                System.out.println("  " + entry.getName() + " " + entry.isDirectory());
            }

            // Change the current working directory
            System.setProperty("user.dir", "subdir/parent/child");

            // Now we'll see the contents of subdir/parent/child when listing the current directory.
            File currentDir = new File(".");
            System.out.println("Listing subdir/parent/child");
            for (File entry : currentDir.listFiles()) {
                System.out.println("  " + entry.getName() + " " + entry.isDirectory());
            }

            // Change back to where we started
            System.setProperty("user.dir", "../../..");

            // We can also visit a directory recursively, including all its sub-directories.
            System.out.println("Visiting subdir");
            Files.walkFileTree(Paths.get("subdir"), new SimpleFileVisitor<Path>() {
                @Override
                public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
                    System.out.println("  " + file + " " + Files.isDirectory(file));
                    return FileVisitResult.CONTINUE;
                }

                @Override
                public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
                    System.out.println("  " + dir + " " + Files.isDirectory(dir));
                    return FileVisitResult.CONTINUE;
                }
            });

        } finally {
            // Clean up
            deleteDirectory(new File("subdir"));
        }
    }

    private static void createEmptyFile(String name) throws IOException {
        Files.write(Paths.get(name), new byte[0]);
    }

    private static void deleteDirectory(File directory) {
        File[] files = directory.listFiles();
        if (files != null) {
            for (File file : files) {
                if (file.isDirectory()) {
                    deleteDirectory(file);
                } else {
                    file.delete();
                }
            }
        }
        directory.delete();
    }
}

To run the program, compile it and use java:

$ javac Directories.java
$ java Directories
Listing subdir/parent
  child true
  file2 false
  file3 false
Listing subdir/parent/child
  file4 false
Visiting subdir
  subdir true
  subdir/file1 false
  subdir/parent true
  subdir/parent/child true
  subdir/parent/child/file4 false
  subdir/parent/file2 false
  subdir/parent/file3 false

This Java program demonstrates various operations with directories:

Creating directories using mkdir() and mkdirs().
Creating empty files.
Listing directory contents.
Changing the current working directory.
Recursively walking a directory tree.

Note that Java doesn’t have a direct equivalent to Go’s defer statement for cleanup, so we use a try-finally block to ensure the temporary directory is deleted at the end.

The Files.walkFileTree() method is used to recursively visit all files and directories, which is similar to Go’s filepath.WalkDir().

Remember to handle exceptions appropriately in a real-world application.

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