array declaration and creation

[Alangudi Balaji Navaneethan]

Hi,

I have a doubt in the following code. Please clear my doubt

class TestArray
{
   public static void main(String[] arg)
   {
       int[] array = {1,2,3,4,5};                // line 1
       int[][] array1 = {{1,2,3},{1,2,4,5},{}};  // line 2
       int[][] array2 = new int[2][];             // line 3
       array2[0] = {1,2,3,4,5};                   // line 4
       array2[1] = {6,7,8,9,10};                  // line 5
   }
}

Upto line 3 I have no problem. I well understood the concept behind them. The compiler generated error messages at line 4 and line 5 saying illegal start of expression.

[vidya sagar]

array2[0] = {1,2,3,4,5}; // line 4
array2[1] = {6,7,8,9,10}; // line 5

array2 is a Two dimensional array
array2[0] - holds only address of a one dimensional array or null
array2[0][0] - holds only values

but in the above case you are assigning values where it is expecting address
changte it to

array2[0][0] = {1,2,3,4,5}; // line 4
array2[0][1] = {6,7,8,9,10}; // line 5

[shyam ramineni]

Hi Vidya,

array2[0][0] = {1,2,3,4,5}; // line 4
array2[0][1] = {6,7,8,9,10}; // line 5
--------------------

The above code change you have suggested did not work.
Below is the code that works. But I donot know the reason behind it.

class TestArray{
 
  public static void main(String[] arg)   {
 
       int[] array = {1,2,3,4,5};
       int[][] array1 = {{1,2,3},{1,2,4,5},{}};
       int[][] array2 = new int[2][];
       array2[0] = new int[] {1,2,3,4,5};
       array2[1] = new int[] {6,7,8,9,10};                  
   }
}  

When we are creating anynomous array and assign that reference to
array2[0] its working.

Can anyone please tell what differnce between line1 and line2, and when to use which one.
int[] a1 = {1,1,1,1}; //line1
int[] a1 = new int[] {1,1,1,1}; // line2

Thanks
Shyam Ramineni

[Georgy Bolyuba]

Hi

int [] i1 = {1,2,3,4}; // OK
 
int [] i2;
i2  = {1,2,3,4}; // Compile error
 
int [] i3 = new int[] {1,2,3,4}; // OK
 
int [] i4;                    
i4 = new int[] {1,2,3,4};     // OK

You can read this
or this for more information.
[ August 05, 2005: Message edited by: George Bolyuba ]