21. Which of these is a process of extracting/removing the state of an object from a stream?

1. 1. Externalization

   
   
   

   2. Deserialization

   
   
   

   3. Serialization

   
   
   

   4. File Filtering

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   Deserialization is a process by which the data written in the stream can be extracted out from the stream.

---

22. Which of these process occur automatically by java run time system?

1. 1. Deserialization

   
   
   

   2. Serialization

   
   
   

   3. Memory allocation

   
   
   

   4. All of Above

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   Serialization, deserialization and Memory allocation occur automatically by java run time system.

---

---

23. Which of these interface extends DataInput interface?

1. 1. ObjectOutput

   
   
   

   2. Serializable

   
   
   

   3. ObjectInput

   
   
   

   4. Externalization

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   ObjectInput interface extends the DataInput interface and supports object serialization.

---

24. Which of these is a method of ObjectInput interface used to deserialize an object from a stream?

1. 1. void close()

   
   
   

   2. Object WriteObject()

   
   
   

   3. int read()

   
   
   

   4. Object readObject()

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   Object readObject()

---

---

25. Which of these class extend InputStream class?

1. 1. ObjectInput

   
   
   

   2. ObjectOutput

   
   
   

   3. ObjectStream

   
   
   

   4. ObjectInputStream

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   ObjectInputStream class extends the InputStream class and implements the ObjectInput interface.

---