What class does java use to read and write files?

Java reads and writes files mainly using classes in the java.io package. Commonly used classes include: 1. File: used to represent the path name of a file or directory; 2. FileReader and FileWriter: used to read and write character streams; 3. BufferedReader and BufferedWriter: provide buffering functions for more efficient reading. Write files; 4. FileInputStream and FileOutputStream: used to read and write byte streams, etc.

Operating system for this tutorial: Windows 10 system, Dell G3 computer.

In Java, reading and writing files mainly uses classes in the java.io package. Commonly used classes include:

1. #File: used to represent the path name of a file or directory.

2. FileReader and FileWriter: used to read and write character streams.

3. BufferedReader and BufferedWriter: Provide buffering functions to read and write files more efficiently.

4. FileInputStream and FileOutputStream: used to read and write byte streams.

5. InputStreamReader and OutputStreamWriter: used to convert between character streams and byte streams.

Here is a simple example demonstrating how to use these classes to read and write files:

java

import java.io.*;  
  
public class FileExample {  
    public static void main(String[] args) {  
        try {  
            // 创建文件对象  
            File file = new File("example.txt");  
  
            // 创建文件读取器  
            FileReader fr = new FileReader(file);  
            BufferedReader br = new BufferedReader(fr);  
  
            // 读取文件内容并输出到控制台  
            String line;  
            while ((line = br.readLine()) != null) {  
                System.out.println(line);  
            }  
  
            // 关闭文件读取器  
            br.close();  
  
            // 创建文件写入器  
            FileWriter fw = new FileWriter(file);  
            BufferedWriter bw = new BufferedWriter(fw);  
  
            // 写入文件内容  
            bw.write("Hello World!");  
  
            // 关闭文件写入器  
            bw.close();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
    }  
}

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