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C:\Users\Mayank\Documents\revision\Demos.java:7: package utils does not exist
import static utils.Repitition.twice;
^
C:\Users\Mayank\Documents\revision\Demos.java:7: static...

1. package utils;
2.
3. public class Repetition {
4. public static String twice(String s) { return s + s; }
5. }
and given another class Demo:

1. // insert code here
2.
3. public class Demo...

ok..i got it...if i call e.printStackTrace() , i get that exception with output

--- Update ---

A runtime exception because i have not serialized collar,though dog was serialized.

---...

i supposed to get an run time exception because my collar obect is not serialized, where as java says that u must get an runtime exception

import java.io.*;

class Dog implements Serializable
{

Collar col;
int dogSize;

Dog(Collar c,int s)
{