Java Tutorial : Java IO (Java ObjectInputStream | Java Serialization) ~ foundjava

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Java Tutorial : Java IO (Java ObjectInputStream | Java Serialization) 

Java Tutorial : Java IO (Java ObjectInputStream | Java Serialization) 

Java Tutorial : Java IO (Java ObjectInputStream | Java Serialization) 

Java Tutorial : Java IO (Java ObjectInputStream | Java Serialization) 

Java Tutorial : Java IO (Java ObjectInputStream | Java Serialization) 

Student.java

import java.io.Serializable;

/*
 * Before you can serialize and de-serialize objects the
 * class of the object must implement java.io.Serializable.
 */
public class Student implements Serializable
{

    private static final long serialVersionUID = -1438960132000208485L;
    private String name;
    private int age;

    public Student(String name, int age)
    {
        super();
        this.name = name;
        this.age = age;
    }

    public String getName()
    {
        return name;
    }

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

    public int getAge()
    {
        return age;
    }

    public void setAge(int age)
    {
        this.age = age;
    }

    @Override
    public String toString()
    {
        return "Student [name=" + name + ", age=" + age + "]";
    }

}

ObjectOutputStreamDemo.java 

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;

public class ObjectOutputStreamDemo
{

    public static void main(String[] args) throws FileNotFoundException,
            IOException, ClassNotFoundException
    {
        ObjectOutputStreamDemo objectOutputStreamDemo = new ObjectOutputStreamDemo();
        objectOutputStreamDemo.writeStudentObject();
    }

    private void writeStudentObject() throws FileNotFoundException, IOException
    {
        FileOutputStream fileOutputStream = null;
        ObjectOutputStream objectOutputStream = null;
        try
        {
            fileOutputStream = new FileOutputStream("student.tmp");
            objectOutputStream = new ObjectOutputStream(fileOutputStream);

            Student student = new Student("Peter", 15);
            System.out.println(student);

            /*
             * Write the specified object to the
             * ObjectOutputStream.
             */
            objectOutputStream.writeObject(student);
            System.out
                    .println("Successfully written student object to the file.\n");
        }
        finally
        {

            if (objectOutputStream != null)
            {
                /*
                 * Closing a ObjectOutputStream will also
                 * close the OutputStream instance to which
                 * the ObjectOutputStream is writing.
                 */
                objectOutputStream.close();
            }
        }

    }

}

Output 

Student [name=Peter, age=15]
Successfully written student object to the file.

student.tmp 

ObjectInputStreamDemo.java 

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;

public class ObjectInputStreamDemo
{

    public static void main(String[] args) throws FileNotFoundException,
            IOException, ClassNotFoundException
    {
        ObjectInputStreamDemo objectInputStreamDemo = new ObjectInputStreamDemo();
        objectInputStreamDemo.readStudentObject();
    }

    private void readStudentObject() throws IOException, FileNotFoundException,
            ClassNotFoundException
    {
        FileInputStream fileInputStream = null;
        ObjectInputStream objectInputStream = null;

        try
        {
            fileInputStream = new FileInputStream("student.tmp");
            objectInputStream = new ObjectInputStream(fileInputStream);

            /*
             * Read an object from the ObjectInputStream.
             */
            Student student = (Student) objectInputStream.readObject();

            System.out
                    .println("Successfully read student object from the file.");

            System.out.println(student);
            System.out.println("Name = " + student.getName());
            System.out.println("Age  = " + student.getAge());
        }
        finally
        {

            if (objectInputStream != null)
            {
                /*
                 * Closing a ObjectInputStream will also
                 * close the InputStream instance from which
                 * the ObjectInputStream is reading.
                 */
                objectInputStream.close();
            }
        }

    }

}

Output 

Successfully read student object from the file.
Student [name=Peter, age=15]
Name = Peter
Age  = 15

Refer:
https://docs.oracle.com/javase/8/docs/api/index.html?java/io/ObjectInputStream.html

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