学习打卡第三天

 1 import java.io.*;
 2 
 3 public class Test3 {
 4 
 5     public static void main(String[] args) {
 6         try {
 7             PrintWriter out = new PrintWriter(
 8                     new BufferedWriter(
 9                             new OutputStreamWriter(
10                                     new FileOutputStream("a.txt"))));
11             String s = "hello world！";
12             out.print(s);//给文件录入信息
13             out.close();
14             BufferedReader in = new BufferedReader(
15                     new InputStreamReader(
16                             new FileInputStream("a.txt")));
17             String line;
18             //读取文件中的信息
19             while((line = in.readLine()) != null) 
20             {
21                 System.out.println(line);
22             }
23             in.close();
24             } catch (FileNotFoundException e) {
25             // TODO Auto-generated catch block
26             e.printStackTrace();
27         } catch (IOException e) {
28                 // TODO Auto-generated catch block
29                 e.printStackTrace();
30             } 
31     }
32 
33 }