OCPJP Simulation Test 10

10

<Back to OCPJP

Question List

Question: What is the result of executing the following code?

  1 import java.io.*;
  2 class Channel implements Serializable {}
  3 public class TV implements Serializable {
  4   private String brand;
  5   private transient int year;
  6   private Channel channel;
  7   public void serialize() {}
  8   public String getBrand() {return this.brand;}
  9   public void setBrand(String brand) {this.brand = brand;}
 10   public int getYear() { return year;}
 11   public void setYear(int year) { this.year = year;}
 12   public Channel getChannel() { return channel;}
 13   public void setChannel(Channel channel) {this.channel = channel;}
 14 
 15   public static void main(String[] args) throws IOException {
 16     try(ObjectOutputStream out = new ObjectOutputStream(
 17       new BufferedOutputStream(new FileOutputStream("tv.dat")))) {
 18       TV tv = new TV();
 19       tv.setBrand("jee");
 20       tv.setYear(2009);
 21       tv.setChannel(new Channel());
 22       out.writeObject(tv);
 23     }
 24   }
 25 }

Choice:
A. The code compiles and runs without any problem.
B. A compile error at line 2
C. A compile error at line 7
D. A compile error at line 16-17
E. A compile error at line 20
F. A compile error at line 22
G. The code compiles but throws Exception at runtime.



Next Question

Answer: A

Explain: The code runs without problem, the answer is A. In order to be serialized or deserialized, a class and all the classes it refers to have to implement Serializable interface. The Serializable is a tagging or marker interface without any methods associated with it. There is no required methods need to override when implementing it.

Study: Use BufferedReader, BufferedWriter, File, FileReader, FileWriter, FileInputStream, FileOutputStream, ObjectOutputStream, ObjectInputStream, and PrintWriter in the java.iopackage