Java Serialization Vs De-Serialization

Java Serialization Vs De-Serialization

• The capability of an object to exist beyond the execution of the program that created it is known as persistence
• To make the file object persistent, the file object has to be saved, saving the file object is called serialization
• JDK 1.2 provides the Serializable interface in the java.iopackage to support object serialization
• The readObject() method of the ObjectInputStreamclass is used to read objects from the stream
• The writeObject() method of the ObjectOutputStream class writes objects to a stream

Example 1

import java.io.*;

class StringSerializeExample
{
	public static void main(String arg[]) throws Exception
	{
	String str;
	System.out.println(“Enter the String”);
	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	str= br.readLine();

	FileOutputStream output = new FileOutputStream(“file1.txt”);
	ObjectOutputStream obj = new ObjectOutputStream(output);
	obj.writeObject(str); //Serialization
	obj.close();

	FileInputStream input = new FileInputStream(“file1.txt”);
	ObjectInputStream obj1 = new ObjectInputStream(input);
	String str1 = null;
	str1=(String)obj1.readObject(); //de-serialization
	System.out.println(“The String is : ” +str1);
	}
}

Example 2

import java.io.*;
class Emp implements Serializable
{
	int eid;
	String ename;
	transient String eadd;

	Emp(int id, String name, String add)
	{
		eid = id;
		ename = name;
		eadd = add;
	}
	void disp()
	{
		System.out.println(+eid + "" +ename + "" +eadd);
	}
}
public class EmpSerialize
{
	public static void main(String arg[]) throws Exception
	{
		Emp e = new Emp(01 ,"Tom" ,"india");

		FileOutputStream f = new FileOutputStream("Employee.txt");
		ObjectOutputStream obj = new ObjectOutputStream(f);
		obj.writeObject(e);

		FileInputStream f1 = new FileInputStream("Employee.txt");
		ObjectInputStream obj1 = new ObjectInputStream(f1);
		Emp e1 = null;
		e1=(Emp) obj1.readObject();

		System.out.println("The employee details is:"); 
		e1.disp();
	}
}