如何以编程方式更改文件权限？

import os
import stat

filename = "example.txt"

# 获取当前文件权限
current_permissions = os.stat(filename).st_mode

# 添加执行权限
new_permissions = current_permissions | stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH

# 更改文件权限
os.chmod(filename, new_permissions)

const fs = require("fs");

const filename = "example.txt";

// 获取当前文件权限
const currentPermissions = fs.statSync(filename).mode;

// 添加执行权限
const newPermissions = currentPermissions | 0o111;

// 更改文件权限
fs.chmodSync(filename, newPermissions);

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.PosixFilePermission;
import java.nio.file.attribute.FileAttribute;
import java.nio.file.attribute.PosixFilePermissions;
import java.io.IOException;

public class FilePermissionsExample {
    public static void main(String[] args) {
        Path path = Paths.get("example.txt");

        // 获取当前文件权限
        FileAttribute<Set<PosixFilePermission>> currentPermissions = Files.getFileAttributeView(path, PosixFileAttributeView.class).readAttributes().permissions();

        // 添加执行权限
        Set<PosixFilePermission> newPermissions = new HashSet<>(currentPermissions);
        newPermissions.add(PosixFilePermission.OWNER_EXECUTE);
        newPermissions.add(PosixFilePermission.GROUP_EXECUTE);
        newPermissions.add(PosixFilePermission.OTHERS_EXECUTE);

        // 更改文件权限
        try {
            Files.setPosixFilePermissions(path, newPermissions);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}