打开一个文本文件,每次读取一行内容,将每一行作为String读入,并将Sring对象置入LinkedList中,按相反顺序打印出LinkList所有行.

Posted 2022-07-17 lillill

import java.io.*;
import java.util.LinkedList;
import static util.Print.print;

public class LoadTest 
    public static void main(String[] args) throws IOException 
        BufferedReader in = new BufferedReader(new FileReader("src/LoadTest.java"));
        String str;
        LinkedList<String> ls=new LinkedList<String>();
        while ((str = in.readLine()) != null) 
           ls.addFirst(str+"\n");
        
        in.close();
        print(ls);
    

　

输出:

[
, 
,     
,         print(ls.toString());
,         in.close();
,         
,            ls.addFirst(str+"\n");
,         while ((str = in.readLine()) != null) 
,         LinkedList<String> ls=new LinkedList<String>();
,         String str;
,         BufferedReader in = new BufferedReader(new FileReader("src/LoadTest.java"));
,     public static void main(String[] args) throws IOException 
, public class LoadTest 
, 
, import static util.Print.print;
, 
, import java.util.LinkedList;
, import java.util.Date;
, import java.io.*;
]

 使读取的文件的名字作为命令行参数形式提供.

public class LoadTest 
    public static void main(String[] args) throws IOException 

        BufferedReader in = new BufferedReader(new FileReader(args[0]));
        String str;
        LinkedList<String> ls=new LinkedList<String>();
        while ((str = in.readLine()) != null) 
           ls.addFirst(str+"\n");
        
        in.close();
        print(ls);
    

　所有行变成大写形式

public class LoadTest 
    public static void main(String[] args) throws IOException 
        BufferedReader in = new BufferedReader(new FileReader(args[0]);
        String str;
        LinkedList<String> ls=new LinkedList<String>();
        while ((str = in.readLine()) != null) 
            ls.addFirst((str+"\n").toUpperCase());
        
        in.close();
        print(ls);