incomerecordbutton.java

个人财务管理的程序 很实用的

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.*;

//该类为"收入记录"按钮增添了监听器
class IncomeRecordButton extends I_O_Button 
   implements ActionListener {
   public IncomeRecordButton(String s,Font f) {
      super(s,f);
      addActionListener(this);
   }

   public void actionPerformed(ActionEvent e) {
      IncomeRecordTable f;
      f=new IncomeRecordTable();
      f.setTitle("收入记录");

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

         for(int i=n-1;i>=0;i--) {
            record[i]=new One_record();
            in.seek(i*One_record.RECORD_SIZE);
            record[i].readData(in);
            f.addRecord(record[i].getDate(),
               record[i].getName(),
               record[i].getAmount(),
               record[i].getExp());
         }
      }
      catch(IOException ioe) {
         System.out.print("Error: "+ioe);
         System.exit(1);
      }
      //********************* 结束提取文件 ******************************** 
         f.show();
   }
}