今天课堂总结

 1 package com.xia;
 2 
 3 import java.io.BufferedReader;
 4 import java.io.BufferedWriter;
 5 import java.io.File;
 6 import java.io.FileReader;
 7 import java.io.FileWriter;
 8 
 9 public class test {
10 
11     public static void main(String[] args) {
12         
13         try {
14             
15             File f = new File ("d:\\233333.txt");
16             
17             //带缓存
18             //writer接口的实现类
19             
20             FileWriter fw = new FileWriter(f,true);
21             
22             //缓存写入类,构造时需要传入writer实例.
23             BufferedWriter bw = new BufferedWriter(fw);
24             
25             bw.write("\n第一句");
26             
27             //自动管理缓存
28             //自动写入:1.缓存满了;2.程序缓存关闭之前;
29             
30             bw.flush(); //主动清空缓存 写入数据.
31             
32             bw.write("\n第二句");
33             
34             bw.close();
35             
36             fw.close();
37             
38             System.out.println("写入完成!");
39             
40             //缓存读
41             
42             FileReader fr = new FileReader(f);
43             
44             BufferedReader br = new BufferedReader(fr);
45             
46             //先第一次读
47 //            String str = br.readLine();
48 //            
49 //            while (str != null)
50 //            {
51 //                System.out.println(str);
52 //                
53 //                str = br.readLine();
54 //            }
55             
56             while (true)
57             {
58                 String str = br.readLine();
59                         
60                 if(str == null)
61                 {
62                     break;
63                 }
64                 
65                 System.out.println(str);
66             }
67             
68         } catch (Exception e) {
69             
70             e.printStackTrace();
71         }
72     }
73 }