Java io作业

 1 package smy;
 2 
 3 import java.io.*;
 4 public class IOwork {
 5     public static void main(String[] args) {
 6         String str="12345abcdef@#%&*软件工程";
 7         File f=new File("D://data.txt");
 8         System.out.println("第一次检测文件是否存在："+f.exists());
 9         try {
10             f.createNewFile();
11             System.out.println("创建文件，再次检测文件是否存在："+f.exists());
12             FileWriter w1=new FileWriter(f);
13             BufferedWriter w2=new BufferedWriter(w1);
14             w2.write(str);
15             w2.close();
16             w1.close();
17             FileReader r1=new FileReader(f);
18             BufferedReader r2=new BufferedReader(r1);
19             System.out.println("读取写入的内容为："+r2.readLine());
20             r2.close();
21             r1.close();
22         } catch (IOException e) {
23             e.printStackTrace();
24         }
25     }
26 }