今天课堂总结

1.带缓存的字符输入输出流

 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 }

2.多进程