Exception in thread "main" java.lang.NullPointerException 空指针错误
2011-01-28 16:07:12| 分类:
java
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package copyfile;
import java.io.*;
public class CopyFile {
/**
* @param args
*/
public static void main(String[] args)
throws Exception {
// TODO Auto-generated method stub
BufferedReader br=new BufferedReader(
new FileReader("line.txt"));
BufferedWriter bw=new BufferedWriter(
new FileWriter("linenum.txt"));
String s,space = null; //错误的地方,应将null改为“ ”就可。
int num=0;
while(br.ready())
{
s=br.readLine();
num++;
bw.write(String.valueOf(num));
bw.write(space);
bw.write(s);
bw.newLine();
}
bw.close();
}
}
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