cow serializer

CowTester.java

package moo;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

public class CowTester {
  
	static class Cow implements Serializable {
		int cowid=-1;
		public Cow(int cowid) {
			this.cowid = cowid;
		}
		public String toString() {
			return "moo: " + Integer.toString(this.cowid);
		}
	}
	
	public static int COWCOUNT = 2;
	public static String FILENAME = "c:\\tmp\\cows.ser";
	
	public static void deletecows() throws Exception {
		File file = new File(FILENAME);
		if (!file.delete()) {
			System.out.println("ERR: unable to delete cows");
		}
	}
	
	public static void writecows() throws Exception {
		Cow[] cows = new Cow[COWCOUNT];
		cows[0] = new Cow(100);
		cows[1] = new Cow(200);
		
		FileOutputStream fout = new FileOutputStream(FILENAME);
		ObjectOutputStream out = new ObjectOutputStream(fout);
		
		out.writeInt(COWCOUNT);
		for(int i=0;i<cows.length;i++) {
			out.writeObject(cows[i]);
		}
		out.close();
		fout.close();
	}
	
	public static void readcows() throws Exception {
		Cow[] cows = new Cow[COWCOUNT];
		FileInputStream finf = new FileInputStream(FILENAME);
		ObjectInputStream in = new ObjectInputStream(finf);
		
		int cow_count = in.readInt();
		for(int i=0;i<cow_count;i++) {
			cows[i] = (Cow)in.readObject();
		}
		in.close();
		finf.close();
		
		printcows(cows);
	}
	
	public static void printcows(Cow[] cows) {
		for(int i=0;i<cows.length;i++) {
			System.out.println(cows[i]);
		}
	}
	
	public static void main(String[] args) throws Exception {
		deletecows();
		writecows();
		readcows();	
	}

}