如何两次或多次读取BufferedReader？ [英] How to read a BufferedReader twice or multiple times?

问题描述

我有一个文本文件，每行一个整数 -

I have a text file with one integer per row -

10
20
50

我想阅读并打印这些数字两次甚至多次。我尝试了一些代码而失败了。如何更改代码以打印列表两次？

I want to read and print these numbers twice or maybe even multiple times. I tried some code and it failed. How do I change my code to print the list twice ?

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.InputStreamReader;

public class DoubleBuffer {

    public static void main(String[] args) {

        try {

            FileInputStream fstream = new FileInputStream("c:/files/numbers.txt");

            BufferedReader br = new BufferedReader(new InputStreamReader(fstream));
            String strLine;

                // Read rows
                while ((strLine = br.readLine()) != null) {
                    System.out.println(strLine);
                }   

                // Read rows again
                while ((strLine = br.readLine()) != null) {
                    System.out.println(strLine);
                }

            in.close();
        } catch (Exception e) {
            System.err.println("Error: " + e.getMessage());
        }//try-catch

    }// main

}// class

推荐答案

现在你可以多次打印。

BufferedReader br = new BufferedReader(new FileReader( "D:/log_2071-04-31.txt" ));
String strLine;
ArrayList<String> ans= new ArrayList<String>();

// Read rows
while ((strLine = br.readLine()) != null) {
    System.out.println(strLine);
    ans.add(strLine);
}

// Read again
for (String result: ans) {
    System.out.println(result);
}

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