bank_record.java

个人财务管理的程序 很实用的

//***********************************************************
//建立处理保存数据的DataFile类
//***********************************************************
import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import javax.swing.table.*;

class Bank_Record {
   public Bank_Record(String name,long number,double nowAmount) {
      this.name=name;
      this.number=number;
      this.nowAmount=nowAmount;
   }
   public Bank_Record() {}

   public String getName() {
      return name;
   }   

   public long getNumber() {
      return number;
   }   

   public double getNowAmount() {
      return nowAmount;
   }   

   public static void save_BR(String name,long number,double nowAmount) {

      //***************** 以下是保存文件操作 ******************************
      try {
         //保存设置的密码
         Bank_Record oner=new Bank_Record(name,number,nowAmount);
         DataOutputStream out=new DataOutputStream(new
            FileOutputStream("bank_record.dat"));
         oner.writeData(out);        
         out.close();
      }
      catch(IOException ioe) {
         System.out.print("Error: "+ioe);
         System.exit(1);
      }
      //****************** 结束保存输入的操作 ********************************
   }


   public static Bank_Record open_BR() {
      Bank_Record[] record={null};

      //***************** 以下是提取文件操作 ******************************
      try {
         RandomAccessFile in=new
            RandomAccessFile("bank_record.dat","rw");
         int n=(int)(in.length()/Bank_Record.RECORD_SIZE);
         record=new Bank_Record[n];

         for(int i=n-1;i>=0;i--) {
            record[i]=new Bank_Record();
            in.seek(i*Bank_Record.RECORD_SIZE);
            record[i].readData(in);
         }
      }
      catch(IOException ioe) {
         System.out.print("Error: "+ioe);
         System.exit(1);
      }
      //********************* 结束提取文件 ******************************** 
      return record[0];
   }

   public void writeData(DataOutput out) throws IOException {
      DataIO.writeFixedString(name,NAME_SIZE,out);//40
      out.writeLong(number);//8
      out.writeDouble(nowAmount);//8
   }

   public void readData(DataInput in) throws IOException {
      name=DataIO.readFixedString(NAME_SIZE,in);
      number=in.readLong();
      nowAmount=in.readDouble();
   }

   public static final int NAME_SIZE=40;
   public static final int RECORD_SIZE
      =2*NAME_SIZE+2*8;

   private String name;
   private long number;
   private double nowAmount;
}