An even more improved wallet!

wallet4.java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;

class Recipt {
    private double balence;
    private String message;
    private String date;

    public double getBalence() {
        return balence;
    }

    public Recipt(String line) {
       String[] lineSplit = line.split("\t");
       balence = Math.round(Double.parseDouble(lineSplit[0]) * 2) / 2;
       date = lineSplit[1];
       if (lineSplit.length == 3) {
          message = lineSplit[2];
       } else {
          message = "---";
       }
    }

    public Recipt(String m, double b) {
       message = m;
       balence = b;
       Date now = new Date();
       SimpleDateFormat f = new SimpleDateFormat("MM/dd/yy");
       date = f.format(now);
    }

    public void setMessage(String mess) {
       message = mess;
    }

    public String toString() {
       return String.format("%.2f",balence) + "\t" + date + "\t" + message;
    }
}

public class Wallet {

   private String name;
   ArrayList<Recipt> ledger;

   public Wallet(String n) {
      name = n;
      ledger = new ArrayList<Recipt>();
   }

   public void addTrans(String m, Double b) {
      ledger.add(new Recipt(m,b));
   }

   public void displayLog(int amount) {
      if (amount >= ledger.size()) {
         amount = ledger.size() - 1;
      }

      for(int i = amount; i >= 0; i--) {
         System.out.println("   $" + ledger.get(i));

      }
   }

    /**
     * This will load the wallet based on it's name from a file.
     */
    private void load() {
       String line;
       try {
          BufferedReader reader = new BufferedReader(new FileReader("." + name + ".wal"));

          while((line = reader.readLine()) != null) {
             ledger.add(new Recipt(line)); 
          }

          reader.close();

       } catch (java.io.FileNotFoundException e) {
          // nothing right now because it will be created in save
       } catch (java.io.IOException e) {
          System.out.println("ERROR: error reading file! ->" + e);
       }

    }

    public double balence() {
       Double bal = 0.0;
       for (Recipt t : ledger) {
          bal += t.getBalence();
       }

       return bal;
    }

    /**
     * this will write the the object to a file named after itself.
     */
    public void save() {
       try {
          PrintWriter fout = new PrintWriter( 
                new BufferedWriter (
                   new FileWriter("." + name + ".wal", true)));
          // note: the true above means that we append to the file

          fout.print(getLatest() + "\n");

          fout.close();

       } catch (Exception e) {
          System.out.println("ERROR:saving wallet file -> " + e);
       }
    }

    public Recipt getLatest() {
       return ledger.get(ledger.size() - 1);
    }

    public void display() {
       if (balence() > 0) {
          System.out.printf("%s has $%.0f\n",name, balence());
       } else if (balence() == 0) {
          System.out.printf("%s is broke!\n", name);
       } else {
          System.out.printf("%s is $%.0f in debt!!!\n",name, balence());
       }
    }

    /**
      This will test out the Wallet object
     */
    public static void main(String[] args) {

       // if it includes a first argument (usually wallet name)
       if (args.length >= 1) {
          if (args[0].equals("-h")) {
             System.out.println("Wallet: a simple command line tracker of expenses.");
             System.out.println("\nHelp:");
             System.out.println("\t To view a wallet: \t$ Java Wallet myWallet");
             System.out.println("\t To add to a wallet: \t$ Java Wallet myWallet 10.00");
             System.out.println("\t To subtract from a wallet: \t$ Java Wallet myWallet -5.00");
             System.out.println("\n NOTE: new wallets will be created if they do not exist.");
             return;
          }

          Wallet mywallet = new Wallet(args[0]);

          mywallet.load();

          // if includes money
          if (args.length > 1) {
             String mess = "";
             // if it includes comment
             if (args.length > 2) {
                for(int i = 2; i < args.length; i++) {
                   mess += args[i] + " ";
                }
             }

             mywallet.addTrans(mess, Double.parseDouble(args[1]));
             mywallet.save();
             mywallet.display();
          }  else {
             mywallet.display();
             mywallet.displayLog(10);
          }


       } else {
          System.out.println("ERROR: no wallet name!\n\tfor help do $ java Wallet -h");
       }
    }
}