Java ObjectInputStream readObjectOverride() Method with Examples

by Online Tutorials Library July 22, 2022

Java ObjectInputStream readObjectOverride() Method

The readObjectOverride() method of ObjectInputStream class is called by the trusted subclasses of ObjectOutputStream that constructed ObjectOutputStream using the protected no-arg constructor. It returns an object.

Syntax

  protected Object readObjectOverride()throws IOException , ClassNotFoundException  

Parameter

No parameter is passed.

Returns

The Object read from the stream.

Throws

ClassNotFoundException

OptionalDataException

IOException

Example 1

  import java.io.*;  public class ObjectInputStreamreadObjectOverridebExample1 extends ObjectInputStream{     public ObjectInputStreamreadObjectOverridebExample1(InputStream in) throws IOException {        super(in);      }           public static void main(String[] args) {        String s = “TutorAspire”;                try {           FileOutputStream outstream = new FileOutputStream(“file1.txt”);           ObjectOutputStream objoutstream = new ObjectOutputStream(outstream);           objoutstream.writeObject(s);           objoutstream.flush();           ObjectInputStreamreadObjectOverridebExample1 ois = new       ObjectInputStreamreadObjectOverridebExample1(new FileInputStream(“file1.txt”));           System.out.println(“” + (String)ois.readObjectOverride());        } catch (Exception ex) {           ex.printStackTrace();        }     }  }  

Output:

null

Example 2

  import java.io.*;      class ObjectInputStreamDemo extends ObjectInputStream   {           public ObjectInputStreamDemo(InputStream in) throws IOException       {           super(in);       }   }   public class ObjectInputStreamreadObjectOverridebExample2 extends ObjectInputStream  {       public ObjectInputStreamreadObjectOverridebExample2(InputStream in) throws IOException {        super(in);      }      public static void main(String[] args)       {                     String str = “TutorAspire”;           try          {                          FileOutputStream outstream = new FileOutputStream(“file1.txt”);               ObjectOutputStream objinstream = new ObjectOutputStream(outstream);                   ObjectInputStream InStream  = new ObjectInputStream(new FileInputStream(“file1.txt”));                  objinstream.writeObject(new Test());               objinstream.writeUTF(str);               objinstream.flush();                   Test a = (Test) InStream.readObject();               ObjectInputStreamreadObjectOverridebExample2 ois = new ObjectInputStreamreadObjectOverridebExample2(new FileInputStream(“file1.txt”));                  System.out.println(“” + (String)ois.readObjectOverride());            System.out.println(“” + str);                       }               catch (Exception excpt)           {               System.out.println(“Error”);               excpt.printStackTrace();           }       }           static class Test implements Serializable      {          static String ss = “Welcome to TutorAspire “;           private String readObject(ObjectInputStream in)           throws IOException, ClassNotFoundException           {                          ObjectInputStream.GetField getfield = in.readFields();                   return (String) getfield.get(“ss”, null);           }                     }   }  

Output:

null TutorAspire

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