How to read and write an Object to file ?

Write an Object to file

Java object can be written into a file for future access, this is called serialization.

• Implement the Serializable interface
• Use ObjectOutputStream.writeObject to write the object into a file.

Example

Address address = new Address("F-31A", "New market", "New Delhi");

FileOutputStream fout = new FileOutputStream("c:\\address.ser");

ObjectOutputStream oos = new ObjectOutputStream(fout);

oos.writeObject(address);

oos.close();

Read an Object from file

The deserialization process is quite similar with the serialization

• Use ObjectInputStream.writeObject to read the content of the file and convert it back to Java object

Example

FileInputStream fin = new FileInputStream("c:\\address.ser");

ObjectInputStream ois = new ObjectInputStream(fin);

Address address = (Address) ois.readObject();

ois.close();