Question

I need to write an entire object to a file and retrieve whenever I want. Suppose I want to write a object of a class “Student” which has attributes such as grades, name, roll etc.. And when I want to access and manipulate the attributes later whenever I need. Can you show me a way to accomplish it?

Answer 1

Use ObjectOutputStream.

 public class Student implements Serializable {

 }

 FileOutputStream fos = new FileOutputStream("Students.dat");
 ObjectOutputStream oos = new ObjectOutputStream(fos);

 Student someStudent = new Student();

 oos.writeObject(someStudent);

 oos.close();

Like so.