Java - 复制到新的 txt 文件

Question

这个程序创建的新 test1.txt 文件完全是空的，原始文件 test.txt 填充了类似“50 3 21 57 10 20”的东西，基本上是整数，它们之间有空格。

import java.util.*;
import java.io.*;

class AddOneToInts 

{

   public static void main(String [] args) throws IOException
   {
       Scanner scan = new Scanner(new BufferedReader(new FileReader( "test.txt" )));
       BufferedWriter writer = new BufferedWriter(new FileWriter( "text1.txt" ));
       boolean cont = true;
       String temp;

       while (cont) {
         if (scan.hasNextInt()) {
            temp = (scan.nextInt()+1) + " ";
            writer.write(temp);
         } else break;
      }
   }
}

Answer 1

您必须关闭流以便 Java 将其内容刷新到文件中:

   Scanner scan = new Scanner(new BufferedReader(new FileReader( "test.txt" )));
   BufferedWriter writer = new BufferedWriter(new FileWriter( "text1.txt" ));
   boolean cont = true;
   String temp;

   while (cont) {
     if (scan.hasNextInt()) {
        temp = (scan.nextInt()+1) + " ";
        writer.write(temp);
     } else break;
  }
  writer.close(); // <<------------------------