Result of the Code

What is result of the below code for
command line-invocation java A 1 2 3

public class A
{
public static void main(String [] args)
{
String [][] array = new String[2][2];
int x;
array[0]=args;
x=array.length;
for(int y=0;y<x;y++)
{
System.out.println(" "+array[0][y]);
}
}
}

A. 0 0
B. 1 2
C. 0 0 0
D. 1 2 3
E. Compilation fails
F. An Exception is thrown at runtime

Have you compiled and run the code yourself? If so, then what do you not understand?

Oh, yes, one other thing: please tell us where you got this question from.
Thanks
[ November 20, 2006: Message edited by: Barry Gaunt ]

At run time you will get the following exception
ArrayIndexOutOfBoundException

I got 1 2 as output but expected Runtime exception.

The question was from K & B.

Thanks,

Rama Krishna

Hi Guys,

What does the statement x = array.length return??? It returns 2 and that is why the o/p 1 2. Is it because array is a two dimensional array, array.length returns 2??

Can anyone explain on this??

Ok, the array.length returns the no of rows. So that is why the O/P 1 2. I got it. It was worth discussing this topic here.

What happens when the below statement executes

array[0]=args; (Command line Arguments : A 1 2 3)


Thanks,

Rama Krishna

It gives 1 2 as the O/P

Hi ranchers,

tricky !

I added only one line to the output and invoked class A from another class:


The last line (I don't mean the "}" ) prints
[[1, 2, 3], [null, null]]

Now what's the length of the array?
What's the length of array[0]?
What's the length of array[1]?


Yours,
Bu.

Originally posted by RAMA KRISHNA CHOWDARY:
I got 1 2 as output but expected Runtime exception.

That's a common misconception in the mind of those who have worked in C++ or similar languages. In Java, there is no such thing as a two dimensional array; rather, nested arrays are arrays of arrays.
In your example, array contains two elements. These elements are actually references to arrays of String i.e. String[]. We can modify the reference contained in the first element of array, to point to any array of String, no matter what its size is.
Hope this will help you understand the output.

Thanks,
Abdul Rehman.

Thanks Rehman for your explanation.

Regards,

Rama Krishna