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Java basics

readObject()


The java.io.ObjectInputStream.readObject() method read an object from the ObjectInputStream.

Syntax:
Library: java.io.ObjectInputStream

public final Object readObject()


Example:

import java.io.*;

public class ObjectInputStreamDemo {

   public static void main(String[] args) {

      String s = "Hello World";
      byte[] b = {'e', 'x', 'a', 'm', 'p', 'l', 'e'};
      try {

         // create a new file with an ObjectOutputStream
         FileOutputStream out = new FileOutputStream("test.txt");
         ObjectOutputStream oout = new ObjectOutputStream(out);

         // write something in the file
         oout.writeObject(s);
         oout.writeObject(b);
         oout.flush();

         // create an ObjectInputStream for the file we created before
         ObjectInputStream ois =
                 new ObjectInputStream(new FileInputStream("test.txt"));

         // read and print an object and cast it as string
         System.out.println("" + (String) ois.readObject());

         // read and print an object and cast it as string
         byte[] read = (byte[]) ois.readObject();
         String s2 = new String(read);
         System.out.println("" + s2);


      } catch (Exception ex) {
         ex.printStackTrace();
      }

   }
}
Let us compile and run the above program, this will produce the following result:

Hello World
example


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