exercise16_3.java

一款用java编写的小型数据库管理系统

import java.io.*;

public class Exercise16_3 {
  public static void main(String[] args) throws IOException {
    DataOutputStream output =
      new DataOutputStream(new FileOutputStream("Exercise16_3.dat"));

    for (int i = 1; i <= 100; i++)
      output.writeInt(i);

    output.close();

  // Declare data input and output streams
      DataInputStream dis = null;

      // Read data
      int count = 0;
      try {
        // Create data input stream
        dis = new DataInputStream(new FileInputStream("Exercise16_3.dat"));
        int total = 0;
        while (dis.available() > 0) {
          int temp = dis.readInt();
          total += temp;
          count++;
          System.out.print(temp + " ");
        }

        System.out.println("\nCount is " + count);
        System.out.println("\nTotal is " + total);
      }
      catch (FileNotFoundException ex) {
        System.out.println("File not found");
      }
      catch (IOException ex) {
        System.out.println(ex.getMessage());
      }
      finally {
        try {
          // Close files
          if (dis != null) dis.close();
        }
        catch (IOException ex) {
          System.out.println(ex);
        }
    }










  }
}