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

```java 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。