Serialize the object to byte array

If java class implement Serializable interface, then you can use below snippet to get the byte array form of the object.

 private static byte[] getByteArray(Object obj) throws IOException {
  ByteArrayOutputStream bos = new ByteArrayOutputStream();
  try (ObjectOutputStream os = new ObjectOutputStream(bos)) {
   os.writeObject(obj);
  }
  return bos.toByteArray();
 }

Employee.java

package com.sample.model;

import java.io.Serializable;

public class Employee implements Serializable {

 private static final long serialVersionUID = 1L;
 private int id;
 private String name;
 private String country;

 public Employee(int id, String name, String country) {
  super();
  this.id = id;
  this.name = name;
  this.country = country;
 }

 public int getId() {
  return id;
 }

 public void setId(int id) {
  this.id = id;
 }

 public String getName() {
  return name;
 }

 public void setName(String name) {
  this.name = name;
 }

 public String getCountry() {
  return country;
 }

 public void setCountry(String country) {
  this.country = country;
 }

 @Override
 public String toString() {
  return "Employee [id=" + id + ", name=" + name + ", country=" + country + "]";
 }

}

Test.java

package com.sample.serialize;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;

import com.sample.model.Employee;

public class Test {

 private static byte[] getByteArray(Object obj) throws IOException {
  ByteArrayOutputStream bos = new ByteArrayOutputStream();
  try (ObjectOutputStream os = new ObjectOutputStream(bos)) {
   os.writeObject(obj);
  }
  return bos.toByteArray();
 }

 public static void main(String args[]) throws IOException {
  Employee emp = new Employee(1, "Chamu", "India");

  byte[] serializedData = getByteArray(emp);

  for (byte b : serializedData) {
   System.out.print(b + ",");
  }
 }
}

Output

-84,-19,0,5,115,114,0,25,99,111,109,46,115,97,109,112,108,101,46,109,111,100,101,108,46,69,109,112,108,111,121,101,101,0,0,0,0,0,0,0,1,2,0,3,73,0,2,105,100,76,0,7,99,111,117,110,116,114,121,116,0,18,76,106,97,118,97,47,108,97,110,103,47,83,116,114,105,110,103,59,76,0,4,110,97,109,101,113,0,126,0,1,120,112,0,0,0,1,116,0,5,73,110,100,105,97,116,0,5,67,104,97,109,117,

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