我有这段代码可以从文本文件中读取,然后对其进行修改。然后将修改的内容写入到另一个文本文件中。
我在 out.write(read);
处遇到空指针异常,而且,并非所有行都被写入,有人可以帮助我吗?谢谢
import java.util.*;
import java.io.*;
public class File
{
BufferedReader in;
BufferedWriter out;
String read;
public File()
{
try {
in = new BufferedReader(new FileReader("myFile.txt"));
Scanner scan = new Scanner(in);
out = new BufferedWriter(new FileWriter("output.txt"));
while (scan.hasNext()) {
read = in.readLine();
//Write codes to modify file here
//___codes not written yet______//
out.write(read);
scan.next();
System.out.println("file output: " + read);
}
out.close();
in.close();
} catch (IOException e) {
System.out.println("There was a problem:" + e);
}
}
public static void main(String[] args)
{
File File = new File();
}
}
最佳答案
尝试
while((read = in.readLine()) != null)
而不是
while (scan.hasNext())
关于java - 文件写入器和文件读取器错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31538896/