读取文件，按行输出

Posted 2020-11-10 wait_for_y

 

 1 package io;
 2 
 3 import java.io.BufferedReader;
 4 import java.io.FileReader;
 5 import java.io.IOException;
 6 import java.util.LinkedList;
 7 import java.util.List;
 8 import java.util.ListIterator;
 9 
10 public class FileIntoList {
11     
12     
13     public static List<String> 
14      read(String filename) throws IOException { 
15         List<String> list = new LinkedList<String>(); 
16         BufferedReader reader = new BufferedReader(
17                                     new FileReader(filename)
18                                 );
19         String s ;
20         while ( (s= reader.readLine())!= null ) {
21             list.add(s);
22         }//使用 readLine() 一般要用BufferedReader
23         reader.close();
24         return list;
25         
26     }
27     
28     
29     public static void main(String[] args) throws IOException {
30         //List<String> list = read("IO1.java"); java.io.FileNotFoundException:
31         List<String> list = read("D:\\\\dev2\\\\workspace\\\\seehope\\\\bigwork\\\\src\\\\io\\\\IO1.java");
32         
33         /*按行倒序输出
34         for(ListIterator<String> it = list.listIterator(list.size()); 
35             it.hasPrevious(); ) {
36             System.out.println(it.previous()); 
37         }//for
38         */
39         for(ListIterator<String> it = list.listIterator(); 
40                 it.hasNext(); ) {
41                 System.out.println(it.next()); 
42             }
43         //迭代器输出
44      } //main
45         
46         
47     }
48     
49     
50  

 

项目结构  

 

运行