Question

1. Which of the following statements is true?

I. When an object is serialized, all of its data attributes are always serialized.

II. When an object is serialized, its methods are not serialized.

III. The Serializable interface does not declare any abstract methods.

Select one:

A. I only

B. II only

C. III only

D. I and II only

E. II and III only

2.

For the code below, and assuming widget.dat exists, which of the following statements are false? (select all that apply)

// assume all appropriate packages have been imported

public class Widget implements Serializable
{
private int x;
public void setX( int d ) { x = d; }
public int getX() { return x; }
}

public class MyProgram
{
public static void main( String [] args ) throws Exception
{
ObjectInputStream in = new ObjectInputStream( new FileInputStream( "widget.dat" ) );
Widget w = (Widget) in.readObject();

System.out.println( w.getX() );
}
}

Select one or more:

A. The program output is 0.

B. The program will not compile.

C. The program will compile, but a runtime error will occur because readObject returns an instance of Object.

D. The program will compile and run, but no output will be produced.

Answer 1

Question 1:
E. II and III only

Question 2:
Options A, B, D