Problem - How you can read from a persisted object from binary file?

Contents

1. 1 Program :
   1. 1.1 Step 1 - Coding
   2. 1.2 Step 2 - Deployment
   3. 1.3 Step 3 - Testing
   4. 1.4 Output

Solution : java.io.ObjectInputStream reads persist object from a binary file opened with help of java.io.FileInputStream.

Prerequisite:- Employee object is already stored in c:/sunilos/sunilos.ser

Program :

Step 1 - Coding

Create a text file c:/sunilos/TestReadEmployee.java and copy below contents.

import java.io.FileInputStream;
import java.io.ObjectInputStream;

/**
 * A program to read from persist data file implemented Serializable interface.
 */
public class TestReadEmployee {

    public static void main(String[] args) throws Exception {
       
        ObjectInputStream in = new ObjectInputStream(new
                FileInputStream("c:/sunilos/sunilos.ser"));
       
        Employee emp = (Employee)in.readObject();
       
        System.out.println("ID: " +emp.getId());
        System.out.println("First Name: " + emp.getFirstName());
        System.out.println("Last Name: " +emp.getLastName());
        System.out.println("Temp Value: "+emp.getTempValue());
      
    }
}

Step 2 - Deployment

1. Create a folder 'c:\sunilos'. 
2. Create or copy TestReadEmployee.java into 'c:\sunilos' folder.
3. Open your command prompt and go to  'c:\sunilos'
   
4. Compile TestReadEmployee.java with help of
   
• javac TestReadEmployee.java command. Command will create TestReadEmployee.class file in the same folder.
  
5. Congratulations!! your Java program is ready to serve.

Step 3 - Testing

1. Make sure you are on Command Prompt under c:\sunilos directory
   
2. Now start your java program from command prompt with help of 
• java TestReadEmployee command.

Output

ID: 1
First Name: Sun
Last Name: Rays
Temp Value: null


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