我有一个文本文件,每行一个整数 –
10 20 50
我想阅读和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？
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
解决方法
现在您可以多次打印.
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);
}
