将代码变为Java代码，1. 创建文件： ```python file = open("filename.txt", "w") # 打开文件，并指定写入模式 file.close() # 关闭文件 ``` 2. 写入文件： ```python file = open("filename.txt", "w") # 打开文件，并指定写入模式 file.write("Hello, World!") # 写入内容 file.close() # 关闭文件 ``` 3. 读取文件： ```python file = open("filename.txt", "r") # 打开文件，并指定读取模式 content = file.read() # 读取文件内容 print(content) # 打印文件内容 file.close() # 关闭文件 ``` ## 4.2. 文件复制和移动 文件复制和移动是常见的文件操作需求。可以使用shutil模块中的函数来执行文件复制和移动。 1. 文件复制： ```python import shutil src_file = "path/to/original_file.txt" dst_file = "path/to/new_file.txt" shutil.copy(src_file, dst_file) # 复制文件 ``` 2. 文件移动： ```python import shutil src_file = "path/to/original_file.txt" dst_dir = "path/to/destination_directory/" shutil.move(src_file, dst_dir) # 移动文件 ``` ## 4.3. 文件删除和重命名 文件删除和重命名也是常见的文件操作需求。 1. 文件删除： ```python import os file = "path/to/file.txt" os.remove(file) # 删除文件 ``` 2. 文件重命名： ```python import os src_file = "path/to/original_file.txt" dst_file = "path/to/new_file.txt" os.rename(src_file, dst_file) # 重命名文件

import java.io.File;
import java.io.FileWriter;
import java.io.FileReader;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.FileNotFoundException;

public class FileOperations {
    public static void main(String[] args) {
        createFile();
        writeFile();
        readFile();
        copyFile();
        moveFile();
        deleteFile();
        renameFile();
    }

    public static void createFile() {
        try {
            File file = new File("filename.txt");
            if (file.createNewFile()) {
                System.out.println("File created: " + file.getName());
            } else {
                System.out.println("File already exists.");
            }
        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }

    public static void writeFile() {
        try {
            FileWriter writer = new FileWriter("filename.txt");
            writer.write("Hello, World!");
            writer.close();
            System.out.println("Successfully wrote to the file.");
        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }

    public static void readFile() {
        try {
            BufferedReader reader = new BufferedReader(new FileReader("filename.txt"));
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }
            reader.close();
        } catch (FileNotFoundException e) {
            System.out.println("File not found.");
            e.printStackTrace();
        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }

    public static void copyFile() {
        File srcFile = new File("path/to/original_file.txt");
        File destFile = new File("path/to/new_file.txt");
        
        try {
            Files.copy(srcFile.toPath(), destFile.toPath());
            System.out.println("File copied successfully.");
        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }

    public static void moveFile() {
        File srcFile = new File("path/to/original_file.txt");
        File destDir = new File("path/to/destination_directory/");
        
        try {
            Files.move(srcFile.toPath(), destDir.toPath().resolve(srcFile.getName()));
            System.out.println("File moved successfully.");
        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }

    public static void deleteFile() {
        File file = new File("path/to/file.txt");
        
        if (file.delete()) {
            System.out.println("File deleted: " + file.getName());
        } else {
            System.out.println("Failed to delete the file.");
        }
    }

    public static void renameFile() {
        File srcFile = new File("path/to/original_file.txt");
        File destFile = new File("path/to/new_file.txt");
        
        if (srcFile.renameTo(destFile)) {
            System.out.println("File renamed successfully.");
        } else {
            System.out.println("Failed to rename the file.");
        }
    }
}

注意：在Java中，文件复制、移动和删除操作需要使用Java的`java.nio.file.Files`类。所以，请确保在代码中导入了`java.nio.file.Files`类。