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Java ObjectInputStream readUnshared() Method with Example

ObjectInputStream Class readUnshared() method: Here, we are going to learn about the readUnshared() method of ObjectInputStream Class with its syntax and example.
Submitted by Preeti Jain, on April 05, 2020

ObjectInputStream Class readUnshared() method

• readUnshared() method is available in java.io package.
• readUnshared() method is used to read "non-shared" or "unshared" object from the ObjectInputStream.
• readUnshared() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• readUnshared() method may throw an exception at the time of reading unshared objects.
  • StreamCorruptedException: This exception may throw when the control information in the stream is not consistent.
  • IOException: This exception may throw when getting any input/output error while performing.
  • ClassNotFoundException: This exception may throw when the serialized object Class could not exist.
  • OptionalDataException: This exception may throw when unexpected primitive data found instead of objects.

Syntax:

    public Object readUnshared();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is Object, it returns reference to deserialized object.

Example:

// Java program to demonstrate the example 
// of Object readUnshared() method of 
// ObjectInputStream

import java.io.*;
public class ReadUnsharedOfOIS {
 public static void main(String[] args) throws Exception {
  Integer in = new Integer(10);

  // Instantiates ObjectOutputStream , ObjectInputStream 
  // FileInputStream and FileOutputStream
  FileOutputStream file_out_stm = new FileOutputStream("D:\\includehelp.txt");
  ObjectOutputStream obj_out_stm = new ObjectOutputStream(file_out_stm);
  FileInputStream file_in_stm = new FileInputStream("D:\\includehelp.txt");
  ObjectInputStream obj_in_stm = new ObjectInputStream(file_in_stm);

  // By using writeUnshared() method is to write
  // unshared object to the obj_out_stm stream
  obj_out_stm.writeUnshared( in );

  obj_out_stm.flush();

  // By using readUnshared() method is to read
  // unshared object and display fields
  Object o = (Object) obj_in_stm.readUnshared();
  System.out.println("obj_in_stm.readUnshared(): " + o);
 }
}

Output

obj_in_stm.readUnshared(): 10