利用文件字节流和文件字符流的构造方法创建对象，通过read和write方法对数据进行读取和写入 用Java语言实现写三个类

在Java中，我们可以创建文件字节流（如`FileInputStream`、`FileOutputStream`等）和文件字符流（如`FileReader`、`FileWriter`等）来处理二进制数据和文本数据。下面我会分别介绍如何创建这三个类，并演示如何使用它们进行读取和写入操作：

1. **FileInputStream** 和 **FileOutputStream**

import java.io.*;

public class FileInputStreamExample {
    public void readBytesFromFile(String filePath) {
        try {
            File file = new File(filePath);
            FileInputStream fis = new FileInputStream(file);
            
            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = fis.read(buffer)) != -1) {
                // 对数据进行处理...
                System.out.println("Read " + bytesRead + " bytes");
            }
            fis.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void writeBytesToFile(String filePath, byte[] data) {
        try {
            File file = new File(filePath);
            FileOutputStream fos = new FileOutputStream(file);
            fos.write(data);
            fos.close();
            System.out.println("Data written to file successfully.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

2. **FileReader** 和 **FileWriter**

import java.io.*;

public class FileReaderWriterExample {
    public void readFileToString(String filePath) {
        try {
            File file = new File(filePath);
            FileReader fr = new FileReader(file);
            StringBuilder sb = new StringBuilder();

            char c;
            while ((c = fr.read()) != -1) {
                sb.append(c);
            }
            String content = sb.toString();
            fr.close();
            System.out.println("Read file content: " + content);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void writeFile(String filePath, String text) {
        try {
            File file = new File(filePath);
            FileWriter fw = new FileWriter(file);
            fw.write(text);
            fw.close();
            System.out.println("Wrote text to file: " + text);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

在这两个类中，`read`和`write`方法用于从文件读取或写入数据，而`close`方法用于关闭流以释放资源。