How many objects are created by the following two statements?

[kishore srimat]

int[] a = new int[10];
int[][] b = new int[10][10];

[Henry Wong]

int[] a = new int[10];

Just one. The int array object. The 10 ints are not objects.

int[][] b = new int[10][10];

Eleven. One array of int array objects. And 10 int array objects. Again, the ints are not objects.

Henry

[Prasun Howlader]

Dear Henry,
I am confused the second statement int[][]a = new int[10][];
You said here 11 object created. But i thought here 1 object created.This array hold 10 array reference variable.

[ahmed yehia]

There are actually 11 objects created, because the array is instantiated using 'new' all ref. variables are assigned to new array objects.

[Jim Yingst]

For the second statement, there is one int[][] array, and ten int[] arrays. The first array holds references to the other ten, which represent individual rows. The statement is equivalent to the following code:

int[][] b = new int[10][]; // creates one object
for (int i = 0; i < b.length; i++)
    b[i] = new int[10]; // creates ten more objects

[Prasun Howlader]

1. int[][] a = new int[10][];
2. int[][] b = new int[10][3];

This two statement each generate 11 object is it true?
[ January 26, 2008: Message edited by: Prasun Howlader ]

[Jim Yingst]

No.

int[][]a = new int[10][]; // creates one object only
 
int[][]b = new int[10][3]; // creates eleven objects

And perhaps I should correct the second comment in my previous post:

int[][] b = new int[10][]; // creates one object
for (int i = 0; i < b.length; i++)
    b[i] = new int[10]; //[B] creates one object each of the ten times it's called[/B]

[Prasun Howlader]

I am sorry because henry told for this statement int[][]a = new int[10][10] and he/she is right.

[Henry Wong]

Originally posted by Prasun Howlader:
I am sorry because henry told for this statement int[][]a = new int[10][10] and he/she is right.

I don't understand your confusion here.


I mentioned:

int[] a = new int[10]; // creates one object

int[][] b = new int[10][10]; // creates eleven objects


Jim mentioned:

int[][]a = new int[10][]; // creates one object only

int[][]b = new int[10][3]; // creates eleven objects


There is no contradiction here. Your response implies that Jim stated something that conflicts with what I stated. Could you elaborate on why you think which of the four statements are in conflict?

Henry

[Prasun Howlader]

Both jim and henry were right. Actually i am confusing this statement

int[][]a = new int[10][];

Now i am clear.

[Sid Robin]

why is that the statement Delta []a[] = new Delta[10][10] for Delta Java Program creates only one object "a" which is array object ? contrary to what every one has explained ?

[Jim Yingst]

It's not possible to explain that, because it's not true.