今天课堂总结

1.带缓存的字符输入输出流

 

package com.xia;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

public class test {

    public static void main(String[] args) {
        
        try {
            
            File f = new File ("d:\\233333.txt");
            
            //带缓存
            //writer接口的实现类
            
            FileWriter fw = new FileWriter(f,true);
            
            //缓存写入类,构造时需要传入writer实例.
            BufferedWriter bw = new BufferedWriter(fw);
            
            bw.write("\n第一句");
            
            //自动管理缓存
            //自动写入:1.缓存满了;2.程序缓存关闭之前;
            
            bw.flush(); //主动清空缓存 写入数据.
            
            bw.write("\n第二句");
            
            bw.close();
            
            fw.close();
            
            System.out.println("写入完成!");
            
            //缓存读
            
            FileReader fr = new FileReader(f);
            
            BufferedReader br = new BufferedReader(fr);
            
            //先第一次读
//            String str = br.readLine();
//            
//            while (str != null)
//            {
//                System.out.println(str);
//                
//                str = br.readLine();
//            }
            
            while (true)
            {
                String str = br.readLine();
                        
                if(str == null)
                {
                    break;
                }
                
                System.out.println(str);
            }
            
        } catch (Exception e) {
            
            e.printStackTrace();
        }
    }
}

 2.多进程