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Core Java - Interview Questions and Answers for 'Serializable' - 6 question(s) found - Order By Newest

Very frequently asked in phone and walk in interviews.
  Q1. What are Marker Interfaces ? Name few Java marker interfaces ?Core Java
Anonymous
Ans. These are the interfaces which have no declared methods.Serializable and cloneable are marker interfaces.

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   Like         Discuss         Correct / Improve     java   oops   interfaces   marker interface   serializable   clonable     Asked in 21 Companies      intermediate        frequent

Try 1 Question(s) Test


 Q2. Whats the purpose of marker interfaces ?
Admin
info@buggybread.com
Ans. They just tell the compiler that the objects of the classes implementing the interfaces with no defined methods need to be treated differently.

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   Like         Discuss         Correct / Improve     java   interfaces   marker interfaces   clonable   serializable      basic        frequent


 Q3. What is the problem with this code ?

class BuggyBread1 {

private BuggyBread2 buggybread2;

public static void main(String[] args){
try {
BuggyBread1 buggybread1 = new BuggyBread1();
ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream(new File("newFile.txt")));
objectOutputStream.writeObject(buggybread1);
} catch (Exception e) {
e.printStackTrace();
}
}
}
Core Java
Admin
info@buggybread.com
Ans. Though we are trying to serialize BuggyBread1 object but we haven't declared the class to implement Serializable.

This will throw java.io.NotSerializableException upon execution.

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   Like         Discuss         Correct / Improve     java   io   file   fileio   coding   code   serialization   notserializableexception   exception   file handling


 Q4. Will this code run fine if BuggyBread2 doesn't implement Serializable interface ?

class BuggyBread1 implements Serializable{
private BuggyBread2 buggybread2 = new BuggyBread2();

public static void main(String[] args){
try {
BuggyBread1 buggybread1 = new BuggyBread1();
ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream(new File("newFile.txt")));
objectOutputStream.writeObject(buggybread1);
} catch (Exception e) {
e.printStackTrace();
}
}
}
Core Java
Admin
info@buggybread.com
Ans. No, It will throw java.io.NotSerializableException.

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   Like         Discuss         Correct / Improve     java   io   file   fileio   coding   code   serialization   notserializableexception   exception   file handling


 Q5. What is the default data type of state variables in Clonable interface and Serializable interface ?Core Java2017-09-25 08:33:18

Ans. Cloneable and Serializable are Marker Interfaces, So these are empty interfaces with no variables.

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   Like         Discuss         Correct / Improve     cloneable  serializable  static variables     Asked in 1 Companies


 Q6. How to avoid cloning, serialization in the singleton class ?Design2019-01-04 10:12:26

Ans. For Cloning-exception,For deserialization-read.resolve()

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   Like         Discuss         Correct / Improve     singleton  cloneable  serializable  serialization  cloning     Asked in 1 Companies




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