Win a copy of Kotlin in Action this week in the Kotlin forum!
programming forums Java Java JSRs Mobile Certification Databases Caching Books Engineering OS Languages Frameworks Products This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
Sheriffs:
Saloon Keepers:
Bartenders:

# Cloneable Object

deepu Bhalotia
Ranch Hand
Posts: 39
class HelloExam
{
public static void main(String[] args)
{
int[][] a = {{1,2},{0,1,2},{-1,0,2}}; // 1

Object[] obj = (Object[])a.clone(); // 2

for(int i = 0; i < obj.length; i++) // 3
{
int[] ia = (int[])obj[i]; // 4
System.out.print(ia[i]); // 5
}
}
}

This Question is given in http://www.danchisholm.net/july21/mybook/chapter5/exam1ans.html.
Answer of this Question is 112. But i am not able to understand.

Can Anybody help me in this matter.
[ April 27, 2005: Message edited by: deepak bhalotia ]

vinuharan haran
Ranch Hand
Posts: 64
Hi,
Clone method creates a copy of the object.so,object 'a' is cloned and is stored in 'obj' array.Now length of 'obj' array is 3.Let us go through the loop now.
when i=0,
ia=obj[0]
so ia,obj[0] refer to a[0].
hence ia[0] is same as a[0][0] which is 1.
when i=1
ia=obj[1]
ia,obj[1] refer to a[1]
so ia[1] is same as a[1][1] which is 1 again.
when i=2
ia=obj[2]
ia,obj[2] refer to a[2]
so ia[2] is same as a[2][2] which is 2
Hope this helps...

deepu Bhalotia
Ranch Hand
Posts: 39
Hi Haran

Can you explain how the array length is 3?
We are making a clone of two dimensional array into one dimensional array.

Thanks
Deepak

vinuharan haran
Ranch Hand
Posts: 64
Hi,
The length of array a is 3.so obj.length is also 3.That is 'a' has three elements.
Dimensional arrays are considered as array of arrays.
Now,
a has three elements which are references to other array.So a.length is 3.

a[0] is again a array of 2 elements .so,length of a[0] is 2.
length of a[1] and a[2] is 3.
Hope this helps...

deepu Bhalotia
Ranch Hand
Posts: 39
Thanks Vinu....

It really Worked....

Thanks,
Deepak

 Did you see how Paul cut 87% off of his electric heat bill with 82 watts of micro heaters?