File Format Specifications for .JAV

Based on available information, the .JAV file format is a Java source code file. It is a plain text file containing source code written in the Java programming language, similar to files with the .java extension. It can be compiled using the Java compiler (javac) into bytecode (.class files). The format has no binary structure or magic header; it is simply text, typically encoded in UTF-8 or ASCII. The content must conform to the Java Language Specification (available at https://docs.oracle.com/javase/specs/jls/se21/html/index.html). Associated MIME type is text/x-java-source. Files with this extension are rare in practice, as .java is the standard extension.

List of all the properties of this file format intrinsic to its file system:

• File name
• File path
• File size (in bytes)
• Creation time
• Last modification time
• Last access time
• File permissions (e.g., read, write, execute for owner, group, others)
• Owner
• Group

Two direct download links for files of format .JAV:
After extensive searching, no public files with the exact .JAV extension were found, as it is a rare variant. Since .JAV files are functionally identical to .java files (both are plain text Java source code), here are two direct download links to sample .java files that can be renamed to .jav if needed:

• https://raw.githubusercontent.com/openjdk/jdk/master/src/java.base/share/classes/java/lang/Object.java
• https://raw.githubusercontent.com/openjdk/jdk/master/src/java.base/share/classes/java/lang/String.java

Ghost blog embedded HTML JavaScript for drag and drop .JAV file to dump properties:

Drag and Drop .JAV File

This can be embedded in a Ghost blog post as raw HTML.

1. Python class for .JAV file:

import os
import time
import stat
import pwd
import grp
from pathlib import Path

class JavFile:
    def __init__(self, filename):
        self.filename = filename
        self.path = Path(filename).resolve()

    def get_properties(self):
        st = os.stat(self.filename)
        properties = {
            'File name': os.path.basename(self.filename),
            'File path': str(self.path),
            'File size (in bytes)': st.st_size,
            'Creation time': time.ctime(st.st_ctime),
            'Last modification time': time.ctime(st.st_mtime),
            'Last access time': time.ctime(st.st_atime),
            'File permissions': stat.filemode(st.st_mode),
            'Owner': pwd.getpwuid(st.st_uid).pw_name,
            'Group': grp.getgrgid(st.st_gid).gr_name
        }
        return properties

    def print_properties(self):
        props = self.get_properties()
        for key, value in props.items():
            print(f"{key}: {value}")

    def read(self):
        # Read content (no decode needed, as it's text)
        with open(self.filename, 'r') as f:
            return f.read()

    def write(self, content):
        # Write content to the file
        with open(self.filename, 'w') as f:
            f.write(content)

# Example usage:
# jav = JavFile('example.jav')
# jav.print_properties()
# content = jav.read()
# jav.write('New content')

1. Java class for .JAV file:

import java.io.*;
import java.nio.file.*;
import java.nio.file.attribute.*;
import java.util.*;

public class JavFile {
    private final Path path;

    public JavFile(String filename) {
        this.path = Paths.get(filename).toAbsolutePath();
    }

    public Map<String, Object> getProperties() throws IOException {
        Map<String, Object> properties = new HashMap<>();
        BasicFileAttributes attrs = Files.readAttributes(path, BasicFileAttributes.class);
        PosixFileAttributes posixAttrs = Files.readAttributes(path, PosixFileAttributes.class);

        properties.put("File name", path.getFileName().toString());
        properties.put("File path", path.toString());
        properties.put("File size (in bytes)", attrs.size());
        properties.put("Creation time", attrs.creationTime().toString());
        properties.put("Last modification time", attrs.lastModifiedTime().toString());
        properties.put("Last access time", attrs.lastAccessTime().toString());
        properties.put("File permissions", posixAttrs.permissions().toString());
        properties.put("Owner", posixAttrs.owner().getName());
        properties.put("Group", posixAttrs.group().getName());

        return properties;
    }

    public void printProperties() throws IOException {
        Map<String, Object> props = getProperties();
        for (Map.Entry<String, Object> entry : props.entrySet()) {
            System.out.println(entry.getKey() + ": " + entry.getValue());
        }
    }

    public String read() throws IOException {
        // Read content (no decode needed, as it's text)
        return Files.readString(path);
    }

    public void write(String content) throws IOException {
        // Write content to the file
        Files.writeString(path, content);
    }

    // Example usage:
    // public static void main(String[] args) throws IOException {
    //     JavFile jav = new JavFile("example.jav");
    //     jav.printProperties();
    //     String content = jav.read();
    //     jav.write("New content");
    // }
}

1. JavaScript class for .JAV file (Node.js, as browser JS can't access local files directly without user input):

const fs = require('fs');
const path = require('path');
const os = require('os');

class JavFile {
    constructor(filename) {
        this.filename = filename;
        this.filePath = path.resolve(filename);
    }

    getProperties() {
        const stats = fs.statSync(this.filename);
        let owner, group;
        try {
            owner = os.userInfo({ uid: stats.uid }).username;
            group = 'N/A'; // Group requires additional modules or platform-specific code
        } catch (e) {
            owner = 'N/A';
            group = 'N/A';
        }
        return {
            'File name': path.basename(this.filename),
            'File path': this.filePath,
            'File size (in bytes)': stats.size,
            'Creation time': new Date(stats.birthtime).toString(),
            'Last modification time': new Date(stats.mtime).toString(),
            'Last access time': new Date(stats.atime).toString(),
            'File permissions': (stats.mode & parseInt('777', 8)).toString(8),
            'Owner': owner,
            'Group': group
        };
    }

    printProperties() {
        const props = this.getProperties();
        for (const [key, value] of Object.entries(props)) {
            console.log(`${key}: ${value}`);
        }
    }

    read() {
        // Read content (no decode needed, as it's text)
        return fs.readFileSync(this.filename, 'utf8');
    }

    write(content) {
        // Write content to the file
        fs.writeFileSync(this.filename, content, 'utf8');
    }
}

// Example usage:
// const jav = new JavFile('example.jav');
// jav.printProperties();
// const content = jav.read();
// jav.write('New content');

1. C class (using C++ for class support, as standard C has no classes):

#include <iostream>
#include <string>
#include <fstream>
#include <sys/stat.h>
#include <pwd.h>
#include <grp.h>
#include <ctime>
#include <unistd.h>

class JavFile {
private:
    std::string filename;
    std::string filePath;

public:
    JavFile(const std::string& fname) : filename(fname) {
        char buf[PATH_MAX];
        realpath(fname.c_str(), buf);
        filePath = std::string(buf);
    }

    void getProperties(struct stat& st) {
        if (stat(filename.c_str(), &st) != 0) {
            throw std::runtime_error("Failed to get file stats");
        }
    }

    void printProperties() {
        struct stat st;
        getProperties(st);

        struct passwd* pw = getpwuid(st.st_uid);
        struct group* gr = getgrgid(st.st_gid);

        std::cout << "File name: " << filename.substr(filename.find_last_of("/\\") + 1) << std::endl;
        std::cout << "File path: " << filePath << std::endl;
        std::cout << "File size (in bytes): " << st.st_size << std::endl;
        std::cout << "Creation time: " << std::ctime(&st.st_ctime);
        std::cout << "Last modification time: " << std::ctime(&st.st_mtime);
        std::cout << "Last access time: " << std::ctime(&st.st_atime);
        std::cout << "File permissions: " << std::oct << (st.st_mode & 0777) << std::endl;
        std::cout << "Owner: " << (pw ? pw->pw_name : "N/A") << std::endl;
        std::cout << "Group: " << (gr ? gr->gr_name : "N/A") << std::endl;
    }

    std::string read() {
        // Read content (no decode needed, as it's text)
        std::ifstream file(filename);
        if (!file) {
            throw std::runtime_error("Failed to open file for reading");
        }
        std::string content((std::istreambuf_iterator<char>(file)), std::istreambuf_iterator<char>());
        return content;
    }

    void write(const std::string& content) {
        // Write content to the file
        std::ofstream file(filename);
        if (!file) {
            throw std::runtime_error("Failed to open file for writing");
        }
        file << content;
    }
};

// Example usage:
// int main() {
//     try {
//         JavFile jav("example.jav");
//         jav.printProperties();
//         std::string content = jav.read();
//         jav.write("New content");
//     } catch (const std::exception& e) {
//         std::cerr << e.what() << std::endl;
//     }
//     return 0;
// }