Java ObjectInputStream readUnshared() Method

The readUnshared() method of ObjectInputStream class reads an "unshared" object from the ObjectInputStream. This method is identical to the readObject method, except that it prevents subsequent calls to readObject and readUnshared from returning additional references to the deserialized instance obtained via this call.

Syntax

Parameter

No parameter is passed.

Returns

Reference to the deserialized object

Throws

ClassNotFoundException

StreamCorruptedException

ObjectStreamException

OptionalDataException

IOException

Example 1

import java.io.*;
import static java.lang.System.out;
public class ObjectInputStreamreadUnsharedExample1 {
   public static void main(String[] args) {
      try {
      
         FileOutputStream outstream = new FileOutputStream("file1.txt");
         ObjectOutputStream objoutstream = new ObjectOutputStream(outstream);
         objoutstream.writeObject(new Task());
         objoutstream.flush();
         ObjectInputStream objinstream = new ObjectInputStream(new FileInputStream("file1.txt"));
          Task  obj = (Task) objinstream.readUnshared();
         System.out.println("" + obj.st);
      } catch (Exception ex) {
         ex.printStackTrace();
      }
   }

   static class Task implements Serializable {
      String st = "Welcome to javaTpoint";
      private String readObject(ObjectInputStream in) 
         throws IOException, ClassNotFoundException {
         ObjectInputStream.GetField g = in.readFields();
         return (String) g.get("st", null);
      }
   }
}

Output:

Welcome to javaTpoint

Example 2

import java.io.*;
import java.io.ObjectInputStream;
public class ObjectInputStreamreadUnsharedExample2   {
   public static void main(String[] args) {
      try {
          FileOutputStream outstream = new FileOutputStream("file1.txt");
          ObjectOutputStream objoutstream = new ObjectOutputStream(outstream);
          FileInputStream instream = new FileInputStream("file2.txt");
          ObjectInputStream objinstream = new ObjectInputStream(instream);
          String str=objinstream.toString();
          objoutstream.writeObject(new task());
          objoutstream.writeObject(str);
          objoutstream.flush();
         ObjectInputStream objinputstram = new ObjectInputStream(new FileInputStream("file1.txt"));
         System.out.println("" + (String) objinstream.readObject());
         task obj1 = (task) objinputstram.readUnshared();
         System.out.println("string  in task class  : " + obj1.str);
      } catch (Exception ex) {
         ex.printStackTrace();
      }
   }
   static class task implements Serializable {
      String str = "javaTpoint";
      private void readObject(ObjectInputStream in)
         throws IOException, ClassNotFoundException {
         in.defaultReadObject();
      }
   }
}

Output:

java.io.ObjectInputStream@1b28cdfa
string that is in task class  : javaTpoint

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