fib.java

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import java.io.*;
public class Fib
{
  private int num;
  private String fileName;
  
  public Fib(int n)
  {
    if(n>0)
    {
      num = n;
      fileName = "FIB_"+Integer.toString(n)+".DAT";
    }
  }
  public void save()
  {
    try
    {
      FileOutputStream fos = new FileOutputStream(fileName);
      DataOutputStream dos = new DataOutputStream(fos);
      int f1 = 1, f2 = 1;
      for(int i=0;i<num;i++)
      {
        dos.writeInt(f1);
        int t = f1 + f2;
        f1 = f2;
        f2 = t;
      }
      fos.close();
    }
    catch(IOException ex)
    {
      System.out.println("写入文件失败!");
    }
  }
  public void show()
  {
    try
    {
      FileInputStream fis = new FileInputStream(fileName);
      DataInputStream dis = new DataInputStream(fis);
      for(int i=0;i<num;i++)
      {
        int t=dis.readInt();
        System.out.print(t+"\t\t");
      }
      fis.close();
    }
    catch(IOException ex)
    {
      System.out.println("读文件失败!");
    }
  }
  public static void main(String[] args)
  {
    Fib f = new Fib(40);
    f.save();
    f.show();
  }
}