java | 缓冲流

• BufferedInputStream
• BufferedOutputStream
• BufferedReader
• BufferedWriter

package com.redisc;

import lombok.extern.slf4j.Slf4j;

import java.io.*;

@Slf4j(topic = "c.Test")
public class Run {
    public static void main(String[] args) throws IOException {
        InputStream is = new FileInputStream("");
        // 低级字节包入高级字节
        BufferedInputStream bis = new BufferedInputStream(is);
        int len = bis.read();
        
    }

}

其原理是，java 会在内存中单独开辟一块缓冲区，然后预先将数据存到缓冲区，用到的时候，从缓冲区读。