Javatry-with-resources使用详解

try (资源声明) {
    // 使用资源
} catch (Exception e) {
    // 异常处理
}

try (FileInputStream fis = new FileInputStream("data.txt");
     BufferedReader reader = new BufferedReader(new InputStreamReader(fis))) {
    
    String line;
    while ((line = reader.readLine()) != null) {
        System.out.println(line);
    }
} catch (IOException e) {
    System.err.println("读取文件出错：" + e.getMessage());
}

try (Socket socket = new Socket("localhost", 8080);
     OutputStream out = socket.getOutputStream();
     InputStream in = socket.getInputStream()) {
    
    out.write("Hello Server".getBytes());
    // 处理输入输出流
}

public class MyResource implements AutoCloseable {
    public MyResource() {
        System.out.println("资源已打开");
    }

    public void doWork() {
        System.out.println("正在工作...");
    }

    @Override
    public void close() {
        System.out.println("资源已关闭");
    }
}

try (MyResource resource = new MyResource()) {
    resource.doWork();
}