bufferedReader 可以在不同的类中，然后将其调用到主类吗？答案

【问题标题】：Can bufferReader be in different class and then call it to the main class?bufferedReader 可以在不同的类中，然后将其调用到主类吗？
【发布时间】：2021-09-01 22:39:21
【问题描述】：

我希望能够读取一个 txt 文件并从不同的类调用 bufferReader 到 main，这可能吗？ 基本上我希望控制台要求用户放置他想要的 txt 文件，如果它存在，那么他可以读取它并将其显示给控制台。

Public static void main(String[] args) throws IOException {
        System.out.println("Give me the path or the name of the file you want to encrypt : ");
        Scanner scanner = new Scanner(System.in);
        String checker = scanner.nextLine();
            if (checker.contains(".txt")) {
                try {
                    InputStream inputStream = new FileInputStream(checker);
                    Scanner sc = new Scanner(inputStream);
                    StringBuffer sb = new StringBuffer();
                    BufferedWriter bw = new BufferedWriter(new FileWriter("copy-"+checker));
                    while (sc.hasNextLine()) {
                        sb.append("\n" + sc.nextLine());

                    }
                    sc.close();
                    System.out.println(sb);
                    System.out.println(AES.encrypt(sb.toString()));
//                  append the result and make a new file... H-O-W?
                    bw.write(AES.encrypt(sb.toString()));
                    System.out.println(AES.decrypt(AES.encrypt(sb.toString())));
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
            } else {
                System.out.println("The file does not exists.");
            }

我想要一个类似于（由主类调用的类 BufferReader{}）的类，而不是 Public static void main

谢谢大家，对不起我的英语！

【问题讨论】：

标签： java bufferedreader filereader reader

【解决方案1】：

您应该阅读有关对象和类的信息。为了您的帮助，您可以像这样解决您的问题。

class Main {
    Public static void main(String[] args) throws IOException {
          MyBuffClass c = new MyBuffClass();
          c.doStuff();
    }
}


class MyBuffClass {
    public void doStuff() {
        System.out.println("Give me the path or the name of the file you want to encrypt : ");
        Scanner scanner = new Scanner(System.in);
        String checker = scanner.nextLine();
            if (checker.contains(".txt")) {
                try {
                    InputStream inputStream = new FileInputStream(checker);
                    Scanner sc = new Scanner(inputStream);
                    StringBuffer sb = new StringBuffer();
                    BufferedWriter bw = new BufferedWriter(new FileWriter("copy-"+checker));
                    while (sc.hasNextLine()) {
                        sb.append("\n" + sc.nextLine());

                    }
                    sc.close();
                    System.out.println(sb);
                    System.out.println(AES.encrypt(sb.toString()));
//                  append the result and make a new file... H-O-W?
                    bw.write(AES.encrypt(sb.toString()));
                    System.out.println(AES.decrypt(AES.encrypt(sb.toString())));
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
            } else {
                System.out.println("The file does not exists.");
            }
    }
}

【讨论】：