save java object in file code example

Example: write an object java in a file

package com.mkyong;

package com.mkyong;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class WriterReader {

	public static void main(String[] args) {

		Person p1 = new Person("John", 30, "Male");
		Person p2 = new Person("Rachel", 25, "Female");

		try {
			FileOutputStream f = new FileOutputStream(new File("myObjects.txt"));
			ObjectOutputStream o = new ObjectOutputStream(f);

			// Write objects to file
			o.writeObject(p1);
			o.writeObject(p2);

			o.close();
			f.close();

			FileInputStream fi = new FileInputStream(new File("myObjects.txt"));
			ObjectInputStream oi = new ObjectInputStream(fi);

			// Read objects
			Person pr1 = (Person) oi.readObject();
			Person pr2 = (Person) oi.readObject();

			System.out.println(pr1.toString());
			System.out.println(pr2.toString());

			oi.close();
			fi.close();

		} catch (FileNotFoundException e) {
			System.out.println("File not found");
		} catch (IOException e) {
			System.out.println("Error initializing stream");
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}