Java中的文件流问题!!(应该很简单)

Question

当执行到下面这句 会产生异常
moninmachine = Integer.parseInt(instream.readLine());instream.readLine()得到的值 可能是数值 
可能不完全是数值
如果不是数值 那么Integer.parseInt就有错了

Answer 1

看看这个你就明白了import java.io.*;public class IOBug {
  public static void main(String[] args) 
  throws Exception {
    DataOutputStream out =
      new DataOutputStream(
        new BufferedOutputStream(
          new FileOutputStream("Data.txt")));
    out.writeDouble(3.14159);
    out.writeBytes("That was the value of pi\n");
    out.writeBytes("This is pi/2:\n");
    out.writeDouble(3.14159/2);
    out.close();    DataInputStream in =
      new DataInputStream(
        new BufferedInputStream(
          new FileInputStream("Data.txt")));
    BufferedReader inbr =
      new BufferedReader(
        new InputStreamReader(in));
    // The doubles written BEFORE the line of text
    // read back correctly:
    System.out.println(in.readDouble());
    // Read the lines of text:
    System.out.println(inbr.readLine());
    System.out.println(inbr.readLine());
    // Trying to read the doubles after the line
    // produces an end-of-file exception:
    System.out.println(in.readDouble());
  }
} ///:~

Answer 2

http://www.csdn.net/develop/read_article.asp?id=19064